From patchwork Wed Feb 10 17:10:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12081279 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8BD18C433E0 for ; Wed, 10 Feb 2021 17:12:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 45B7C64DFF for ; Wed, 10 Feb 2021 17:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232218AbhBJRLm (ORCPT ); Wed, 10 Feb 2021 12:11:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232193AbhBJRLf (ORCPT ); Wed, 10 Feb 2021 12:11:35 -0500 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83CD3C061756 for ; Wed, 10 Feb 2021 09:10:51 -0800 (PST) Received: by mail-pj1-x102f.google.com with SMTP id z9so1501708pjl.5 for ; Wed, 10 Feb 2021 09:10:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ru6h1j/YIj3xrtPVTo1pv1Pz995jHBhEUi/qYOZbRz8=; b=Ff+N/H43BG+I/T4N2pdZRNi7nfRY3HNUUgxDLHi0WCBgmYyTPevEO80FjZACgUen76 QtgY0n9Wngtuj9hgJyj2VRPGwMq9e+dl7XA5WgQgq2jnf6bSXpLAElrg/9s/YaqMQbLb N9GVibzSyhsAczUaidKOXXFNsh+s8Q/rIBazI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ru6h1j/YIj3xrtPVTo1pv1Pz995jHBhEUi/qYOZbRz8=; b=n1R64HACntwK9J7CT6Cls3OlnV+ZbeOJFYWi4mGrsGwqD8mn9UdcB3lJ6IF3l4nwL+ fS5kxkxTAKpDwUA6TKx39tUyUOr0Qpj7ikBmizetOv1oftLILajinykn0DLymbEFsLg3 qnzISXjlw6zOx8Zf7AQNGeUk6FNoTjhxDUGtjI48NhGndwebvPDlXOAvnQm94Gf6R/aA ZSjkxVFyZrsxnN31xrp5DNvomDzDm2R8K6oxILzJFz8dCdKVbuZetCNBTWmm0Ry3EVH6 k/uC0eKBX9ArTzYn/F6sLF09nkAvkc9MMzVUIBYlm/Ls0bR1oayOtFCdyKORAWXT+TMs N2eQ== X-Gm-Message-State: AOAM531u6YBHBI8vT2h8EZyNkBgTpt7oZovo+sKerh3JwzkuQCX/8SEO RpCVeYEoSqW1OUQ/ZB0H2Rd4zg== X-Google-Smtp-Source: ABdhPJwJE8+kZQK9NPhmP8pTGBRiXX6lDO1NUXzvaYRJ/+GOql3oRTgZ0ueQPWa5utTYrgbWQ43V5A== X-Received: by 2002:a17:90a:8c87:: with SMTP id b7mr4114508pjo.158.1612977050513; Wed, 10 Feb 2021 09:10:50 -0800 (PST) Received: from localhost ([2620:15c:202:1:d8e6:826a:fc50:2158]) by smtp.gmail.com with UTF8SMTPSA id y24sm2898957pfr.152.2021.02.10.09.10.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Feb 2021 09:10:49 -0800 (PST) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: devicetree@vger.kernel.org, Peter Chen , Stephen Boyd , Alan Stern , Ravi Chandra Sadineni , Bastien Nocera , linux-kernel@vger.kernel.org, Douglas Anderson , linux-usb@vger.kernel.org, Krzysztof Kozlowski , Matthias Kaehlcke Subject: [PATCH v5 1/4] dt-bindings: usb: Add binding for discrete onboard USB hubs Date: Wed, 10 Feb 2021 09:10:36 -0800 Message-Id: <20210210091015.v5.1.I248292623d3d0f6a4f0c5bc58478ca3c0062b49a@changeid> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210210171040.684659-1-mka@chromium.org> References: <20210210171040.684659-1-mka@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Discrete onboard USB hubs (an example for such a hub is the Realtek RTS5411) need to be powered and may require initialization of other resources (like GPIOs or clocks) to work properly. This adds a device tree binding for these hubs. Signed-off-by: Matthias Kaehlcke --- Changes in v5: - updated 'title' - only use standard USB compatible strings - deleted 'usb_hub' node - renamed 'usb_controller' node to 'usb-controller' - removed labels from USB nodes - added 'vdd-supply' to USB nodes Changes in v4: - none Changes in v3: - updated commit message - removed recursive reference to $self - adjusted 'compatible' definition to support multiple entries - changed USB controller phandle to be a node Changes in v2: - removed 'wakeup-source' and 'power-off-in-suspend' properties - consistently use spaces for indentation in example .../bindings/usb/onboard_usb_hub.yaml | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml diff --git a/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml new file mode 100644 index 000000000000..bf4ec52e6c7b --- /dev/null +++ b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/usb/onboard_usb_hub.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Binding for discrete onboard USB hubs + +maintainers: + - Matthias Kaehlcke + +properties: + compatible: + items: + - enum: + - usbbda,5411 + - usbbda,411 + + vdd-supply: + description: + phandle to the regulator that provides power to the hub. + +required: + - compatible + - vdd-supply + +examples: + - | + usb-controller { + dr_mode = "host"; + #address-cells = <1>; + #size-cells = <0>; + + /* 2.0 hub on port 1 */ + hub_2_0: hub@1 { + compatible = "usbbda,5411"; + reg = <1>; + vdd-supply = <&pp3300_hub>; + }; + + /* 3.0 hub on port 2 */ + hub_3_0: hub@2 { + compatible = "usbbda,411"; + reg = <2>; + vdd-supply = <&pp3300_hub>; + }; + }; + +... From patchwork Wed Feb 10 17:10:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12081299 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-24.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 649FFC433E0 for ; Wed, 10 Feb 2021 17:12:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23FC364DD4 for ; Wed, 10 Feb 2021 17:12:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232024AbhBJRMX (ORCPT ); Wed, 10 Feb 2021 12:12:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232276AbhBJRMN (ORCPT ); Wed, 10 Feb 2021 12:12:13 -0500 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 405FCC061793 for ; Wed, 10 Feb 2021 09:10:54 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id k13so1650056pfh.13 for ; Wed, 10 Feb 2021 09:10:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=VzbfTHMttaXB47C9ako1BqW4V9U7zgGcl2uvPHK1aZM=; b=i0nArpNK1WhWK0dPRQbuB3CZJmeGf4LDbfc32vGK3O5MXINGFonh47bthwAUArSDfz GkAXvGBWwNyiEmDmI3SYM4ztUSI84P9Fch7so2MDczaex8H9Mdr7z+HoXOe3xQiGxhg8 nHOeEU5OUJpItanql0tQiRT+L8pFUXEjDVgzI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=VzbfTHMttaXB47C9ako1BqW4V9U7zgGcl2uvPHK1aZM=; b=L7TjzvK3QkEW5PcUt0Gp4DgNk9smVQuzURNiI1kny+9zsCQLhZZIjvhh/fIV42XD8r OykInckzwgNg8USDNmA3O09T6WlMM8wi6dRDDuc7uT3y5SWIcIObRrOv1WYi9F9ExZRh +ivdfnyOqZF+COutwBeu+3NbeDcbhriIAt9SrfKcZkUjC/yEmmKsDcFWiKDnXxJC/bKc j9YzxGc3mTIJnmBKADAUwinfkVgvmBw0hZYY0dVsnLryTEg6QOjMqQHx7a1dD303mC7N 0aMzRrKeY6eIm6uMEOW+1m9gOpkf4RbictsxfXwGyWXRYJJWLklAeuQE3r8KnuHyclQ8 jQBQ== X-Gm-Message-State: AOAM532z8C/qOPZfCcka3IJZGFHZAwx7vyY245rczFIP82ZKDdq6hVHE 0bBVCafGWgyq30G7eSaFVdfKMQ== X-Google-Smtp-Source: ABdhPJwg6t2sU29ysqWDbsZefbbJe6A2E7gwPTbSu4jv/oWOR/sE4MRGY2AddUbs62BKPay721h68A== X-Received: by 2002:a63:70f:: with SMTP id 15mr3930321pgh.250.1612977053687; Wed, 10 Feb 2021 09:10:53 -0800 (PST) Received: from localhost ([2620:15c:202:1:d8e6:826a:fc50:2158]) by smtp.gmail.com with UTF8SMTPSA id u31sm3228684pgl.9.2021.02.10.09.10.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Feb 2021 09:10:52 -0800 (PST) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: devicetree@vger.kernel.org, Peter Chen , Stephen Boyd , Alan Stern , Ravi Chandra Sadineni , Bastien Nocera , linux-kernel@vger.kernel.org, Douglas Anderson , linux-usb@vger.kernel.org, Krzysztof Kozlowski , Matthias Kaehlcke , Al Cooper , "Alexander A. Klimov" , Masahiro Yamada Subject: [PATCH v5 2/4] USB: misc: Add onboard_usb_hub driver Date: Wed, 10 Feb 2021 09:10:37 -0800 Message-Id: <20210210091015.v5.2.I7c9a1f1d6ced41dd8310e8a03da666a32364e790@changeid> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210210171040.684659-1-mka@chromium.org> References: <20210210171040.684659-1-mka@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The main issue this driver addresses is that a USB hub needs to be powered before it can be discovered. For discrete onboard hubs (an example for such a hub is the Realtek RTS5411) this is often solved by supplying the hub with an 'always-on' regulator, which is kind of a hack. Some onboard hubs may require further initialization steps, like changing the state of a GPIO or enabling a clock, which requires even more hacks. This driver creates a platform device representing the hub which performs the necessary initialization. Currently it only supports switching on a single regulator, support for multiple regulators or other actions can be added as needed. Different initialization sequences can be supported based on the compatible string. Besides performing the initialization the driver can be configured to power the hub off during system suspend. This can help to extend battery life on battery powered devices which have no requirements to keep the hub powered during suspend. The driver can also be configured to leave the hub powered when a wakeup capable USB device is connected when suspending, and power it off otherwise. Technically the driver consists of two drivers, the platform driver described above and a very thin USB driver that subclasses the generic driver. The purpose of this driver is to provide the platform driver with the USB devices corresponding to the hub(s) (a hub controller may provide multiple 'logical' hubs, e.g. one to support USB 2.0 and another for USB 3.x). Note: the current driver/binding only works with hubs connected directly to a root hub. The reason for this is that USB devices find their corresponding platform device by iterating over the child device tree nodes of their parent until they find a node that has a supported compatible string and an associated platform device. This works as long as there is only one such device. More than one supported onboard hub could be connected to the parent (like on a 2nd, 3rd, ... level hub with multiple downstream ports) some other way for identifying the platform device is needed. The relationship could be established through a phandle in the node of the USB device(s). Co-developed-by: Ravi Chandra Sadineni Signed-off-by: Ravi Chandra Sadineni Signed-off-by: Matthias Kaehlcke --- Changes in v5: - the platform device is now instantiated from the same DT node as the 'primary' USB hub device - use the USB compatible strings for the platform device - refactored _find_onboard_hub() to search the parents child nodes for a platform device with a matching compatible string - added exported function of_is_onboard_usb_hub() to allow other drivers (like xhci_plat) to check if one of their child DT nodes is a supported hub - use late suspend to make sure info about wakeup enabled descendants is updated - call driver_attach() for the USB driver in onboard_hub_probe() to make sure the driver is re-attached after the device_release_driver() calls in onboard_hub_remove() - renamed sysfs attribute 'power_off_in_suspend' to 'always_powered_in_suspend' - added sysfs symlinks between platform device and USB devices - marked 'onboard_hub_pm_ops' as __maybe_unused - removed 'realtek' compatible string which is not needed at this point - fix log for regulator_disable() failure Changes in v4: - updated Kconfig documentation - changed the loop in onboard_hub_remove() to release the hub lock before unbinding the USB device and make self deadlock prevention less clunky - fixed return value in onboard_hub_usbdev_probe() - added entry to MAINTAINERS file Changes in v3: - updated the commit message - updated description in Kconfig - remove include of 'core/usb.h' - use 'is_powered_on' flag instead of 'has_wakeup_capable_descendants' - added 'going_away' flag to struct onboard_hub - don't allow adding new USB devices when the platform device is going away - don't bother with deleting the list item in onboard_hub_remove_usbdev() when the platform device is going away - don't assume in onboard_hub_suspend() that all USB hub devices are connected to the same controller - removed unnecessary devm_kfree() from onboard_hub_remove_usbdev() - fixed error handling in onboard_hub_remove_usbdev() - use kstrtobool() instead of strtobool() in power_off_in_suspend_store() - unbind USB devices in onboard_hub_remove() to avoid dangling references to the platform device - moved put_device() for platform device to _find_onboard_hub() - changed return value of onboard_hub_remove_usbdev() to void - evaluate return value of onboard_hub_add_usbdev() - register 'power_off_in_suspend' as managed device attribute - use USB_DEVICE macro instead manual initialization - add unwinding to onboard_hub_init() - updated MODULE_DESCRIPTION - use module_init() instead of device_initcall() Changes in v2: - check wakeup enabled state of the USB controller instead of using 'wakeup-source' property - use sysfs attribute instead of DT property to determine if the hub should be powered off at all during system suspend - added missing brace in onboard_hub_suspend() - updated commit message - use pm_ptr for pm_ops as suggested by Alan Changes in v1: - renamed the driver to 'onboard_usb_hub' - single file for platform and USB driver - USB hub devices register with the platform device - the DT includes a phandle of the platform device - the platform device now controls when power is turned off - the USB driver became a very thin subclass of the generic USB driver - enabled autosuspend support MAINTAINERS | 7 + drivers/usb/misc/Kconfig | 18 ++ drivers/usb/misc/Makefile | 1 + drivers/usb/misc/onboard_usb_hub.c | 409 +++++++++++++++++++++++++++++ include/linux/usb/onboard_hub.h | 15 ++ 5 files changed, 450 insertions(+) create mode 100644 drivers/usb/misc/onboard_usb_hub.c create mode 100644 include/linux/usb/onboard_hub.h diff --git a/MAINTAINERS b/MAINTAINERS index d3e847f7f3dc..05502ce8d5c8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13188,6 +13188,13 @@ S: Maintained T: git git://linuxtv.org/media_tree.git F: drivers/media/i2c/ov9734.c +ONBOARD USB HUB DRIVER +M: Matthias Kaehlcke +L: linux-usb@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml +F: drivers/usb/misc/onboard_usb_hub.c + ONENAND FLASH DRIVER M: Kyungmin Park L: linux-mtd@lists.infradead.org diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index 8f1144359012..9a77ce5483dc 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -284,3 +284,21 @@ config BRCM_USB_PINMAP This option enables support for remapping some USB external signals, which are typically on dedicated pins on the chip, to any gpio. + +config USB_ONBOARD_HUB + tristate "Onboard USB hub support" + depends on OF || COMPILE_TEST + help + Say Y here if you want to support discrete onboard USB hubs that + don't require an additional control bus for initialization, but + need some nontrivial form of initialization, such as enabling a + power regulator. An example for such a hub is the Realtek + RTS5411. + + The driver can be configured to turn off the power of the hub + during system suspend. This may reduce power consumption while + the system is suspended. + + To compile this driver as a module, choose M here: the + module will be called onboard_usb_hub. + diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index 5f4e598573ab..2c5aec6f1b26 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -32,3 +32,4 @@ obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o obj-$(CONFIG_BRCM_USB_PINMAP) += brcmstb-usb-pinmap.o +obj-$(CONFIG_USB_ONBOARD_HUB) += onboard_usb_hub.o diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c new file mode 100644 index 000000000000..b88aaefa95f4 --- /dev/null +++ b/drivers/usb/misc/onboard_usb_hub.c @@ -0,0 +1,409 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for onboard USB hubs + * + * Copyright (c) 2020, Google LLC + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct usb_device_driver onboard_hub_usbdev_driver; + +/************************** Platform driver **************************/ + +struct udev_node { + struct usb_device *udev; + struct list_head list; +}; + +struct onboard_hub { + struct regulator *vdd; + struct device *dev; + bool always_powered_in_suspend; + bool is_powered_on; + bool going_away; + struct list_head udev_list; + struct mutex lock; +}; + +static int onboard_hub_power_on(struct onboard_hub *hub) +{ + int err; + + err = regulator_enable(hub->vdd); + if (err) { + dev_err(hub->dev, "failed to enable regulator: %d\n", err); + return err; + } + + hub->is_powered_on = true; + + return 0; +} + +static int onboard_hub_power_off(struct onboard_hub *hub) +{ + int err; + + err = regulator_disable(hub->vdd); + if (err) { + dev_err(hub->dev, "failed to disable regulator: %d\n", err); + return err; + } + + hub->is_powered_on = false; + + return 0; +} + +static int __maybe_unused onboard_hub_suspend(struct device *dev) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + struct udev_node *node; + bool power_off; + int rc = 0; + + if (hub->always_powered_in_suspend) + return 0; + + power_off = true; + + mutex_lock(&hub->lock); + + list_for_each_entry(node, &hub->udev_list, list) { + if (!device_may_wakeup(node->udev->bus->controller)) + continue; + + if (usb_wakeup_enabled_descendants(node->udev)) { + power_off = false; + break; + } + } + + mutex_unlock(&hub->lock); + + if (power_off) + rc = onboard_hub_power_off(hub); + + return rc; +} + +static int __maybe_unused onboard_hub_resume(struct device *dev) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + int rc = 0; + + if (!hub->is_powered_on) + rc = onboard_hub_power_on(hub); + + return rc; +} + +static int onboard_hub_add_usbdev(struct onboard_hub *hub, struct usb_device *udev) +{ + struct udev_node *node; + char link_name[64]; + int ret = 0; + + mutex_lock(&hub->lock); + + if (hub->going_away) { + ret = -EINVAL; + goto unlock; + } + + node = devm_kzalloc(hub->dev, sizeof(*node), GFP_KERNEL); + if (!node) { + ret = -ENOMEM; + goto unlock; + } + + node->udev = udev; + + list_add(&node->list, &hub->udev_list); + + snprintf(link_name, sizeof(link_name), "usb_dev.%s", dev_name(&udev->dev)); + WARN_ON(sysfs_create_link(&hub->dev->kobj, &udev->dev.kobj, link_name)); + +unlock: + mutex_unlock(&hub->lock); + + return ret; +} + +static void onboard_hub_remove_usbdev(struct onboard_hub *hub, struct usb_device *udev) +{ + struct udev_node *node; + char link_name[64]; + + snprintf(link_name, sizeof(link_name), "usb_dev.%s", dev_name(&udev->dev)); + sysfs_remove_link(&hub->dev->kobj, link_name); + + mutex_lock(&hub->lock); + + list_for_each_entry(node, &hub->udev_list, list) { + if (node->udev == udev) { + list_del(&node->list); + break; + } + } + + mutex_unlock(&hub->lock); +} + +static ssize_t always_powered_in_suspend_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", hub->always_powered_in_suspend); +} + +static ssize_t always_powered_in_suspend_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + bool val; + int ret; + + ret = kstrtobool(buf, &val); + if (ret < 0) + return ret; + + hub->always_powered_in_suspend = val; + + return count; +} +static DEVICE_ATTR_RW(always_powered_in_suspend); + +static struct attribute *onboard_hub_sysfs_entries[] = { + &dev_attr_always_powered_in_suspend.attr, + NULL, +}; + +static const struct attribute_group onboard_hub_sysfs_group = { + .attrs = onboard_hub_sysfs_entries, +}; + +static int onboard_hub_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct onboard_hub *hub; + int err; + + hub = devm_kzalloc(dev, sizeof(*hub), GFP_KERNEL); + if (!hub) + return -ENOMEM; + + hub->vdd = devm_regulator_get(dev, "vdd"); + if (IS_ERR(hub->vdd)) + return PTR_ERR(hub->vdd); + + hub->dev = dev; + mutex_init(&hub->lock); + INIT_LIST_HEAD(&hub->udev_list); + + dev_set_drvdata(dev, hub); + + err = devm_device_add_group(dev, &onboard_hub_sysfs_group); + if (err) { + dev_err(dev, "failed to create sysfs entries: %d\n", err); + return err; + } + + err = onboard_hub_power_on(hub); + if (err) + return err; + + /* + * The USB driver might have been detached from the USB devices by + * onboard_hub_remove() make sure to re-attach it if needed. + */ + (void)driver_attach(&onboard_hub_usbdev_driver.drvwrap.driver); + + return 0; +} + +static int onboard_hub_remove(struct platform_device *pdev) +{ + struct onboard_hub *hub = dev_get_drvdata(&pdev->dev); + struct udev_node *node; + struct usb_device *udev; + + hub->going_away = true; + + mutex_lock(&hub->lock); + + /* unbind the USB devices to avoid dangling references to this device */ + while (!list_empty(&hub->udev_list)) { + node = list_first_entry(&hub->udev_list, struct udev_node, list); + udev = node->udev; + + /* + * Unbinding the driver will call onboard_hub_remove_usbdev(), + * which acquires hub->lock. We must release the lock first. + */ + get_device(&udev->dev); + mutex_unlock(&hub->lock); + device_release_driver(&udev->dev); + put_device(&udev->dev); + mutex_lock(&hub->lock); + } + + mutex_unlock(&hub->lock); + + return onboard_hub_power_off(hub); +} + +static const struct of_device_id onboard_hub_match[] = { + { .compatible = "usbbda,411" }, + { .compatible = "usbbda,5411" }, + {} +}; +MODULE_DEVICE_TABLE(of, onboard_hub_match); + +bool of_is_onboard_usb_hub(const struct device_node *np) +{ + return !!of_match_node(onboard_hub_match, np); +} +EXPORT_SYMBOL_GPL(of_is_onboard_usb_hub); + +static const struct dev_pm_ops __maybe_unused onboard_hub_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(onboard_hub_suspend, onboard_hub_resume) +}; + +static struct platform_driver onboard_hub_driver = { + .probe = onboard_hub_probe, + .remove = onboard_hub_remove, + + .driver = { + .name = "onboard-usb-hub", + .of_match_table = onboard_hub_match, + .pm = pm_ptr(&onboard_hub_pm_ops), + }, +}; + +/************************** USB driver **************************/ + +#define VENDOR_ID_REALTEK 0x0bda + +/* + * Returns the onboard_hub platform device that is associated with the USB + * device passed as parameter. + * + * The function assumes that only one physical hub is connected to the + * parent, more complex configurations are not supported. + */ +static struct onboard_hub *_find_onboard_hub(struct device *dev) +{ + struct device_node *np; + + for_each_child_of_node(dev->of_node->parent, np) { + struct platform_device *pdev; + + if (!of_match_node(onboard_hub_match, np)) + continue; + + pdev = of_find_device_by_node(np); + if (pdev) { + of_node_put(np); + put_device(&pdev->dev); + return dev_get_drvdata(&pdev->dev); + } + } + + return ERR_PTR(-EPROBE_DEFER); +} + +static int onboard_hub_usbdev_probe(struct usb_device *udev) +{ + struct device *dev = &udev->dev; + struct onboard_hub *hub; + int err; + + /* ignore supported hubs without device tree node */ + if (!dev->of_node) + return -ENODEV; + + hub = _find_onboard_hub(dev); + if (IS_ERR(hub)) + return PTR_ERR(hub); + + dev_set_drvdata(dev, hub); + + err = onboard_hub_add_usbdev(hub, udev); + if (err) + return err; + + WARN_ON(sysfs_create_link(&udev->dev.kobj, &hub->dev->kobj, "onboard_hub_dev")); + + return 0; +} + +static void onboard_hub_usbdev_disconnect(struct usb_device *udev) +{ + struct onboard_hub *hub = dev_get_drvdata(&udev->dev); + + sysfs_remove_link(&udev->dev.kobj, "onboard_hub_dev"); + + onboard_hub_remove_usbdev(hub, udev); +} + +static const struct usb_device_id onboard_hub_id_table[] = { + { USB_DEVICE(VENDOR_ID_REALTEK, 0x0411) }, /* RTS5411 USB 3.0 */ + { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.0 */ + {}, +}; + +MODULE_DEVICE_TABLE(usb, onboard_hub_id_table); + +static struct usb_device_driver onboard_hub_usbdev_driver = { + + .name = "onboard-usb-hub", + .probe = onboard_hub_usbdev_probe, + .disconnect = onboard_hub_usbdev_disconnect, + .generic_subclass = 1, + .supports_autosuspend = 1, + .id_table = onboard_hub_id_table, +}; + +/************************** Driver (de)registration **************************/ + +static int __init onboard_hub_init(void) +{ + int ret; + + ret = platform_driver_register(&onboard_hub_driver); + if (ret) + return ret; + + ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE); + if (ret) + platform_driver_unregister(&onboard_hub_driver); + + return ret; +} +module_init(onboard_hub_init); + +static void __exit onboard_hub_exit(void) +{ + usb_deregister_device_driver(&onboard_hub_usbdev_driver); + platform_driver_unregister(&onboard_hub_driver); +} +module_exit(onboard_hub_exit); + +MODULE_AUTHOR("Matthias Kaehlcke "); +MODULE_DESCRIPTION("Driver for discrete onboard USB hubs"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/usb/onboard_hub.h b/include/linux/usb/onboard_hub.h new file mode 100644 index 000000000000..9be52dfae653 --- /dev/null +++ b/include/linux/usb/onboard_hub.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __LINUX_USB_ONBOARD_HUB_H +#define __LINUX_USB_ONBOARD_HUB_H + +#ifdef CONFIG_USB_ONBOARD_HUB +bool of_is_onboard_usb_hub(const struct device_node *np); +#else +static inline bool of_is_onboard_usb_hub(const struct device_node *np) +{ + return false; +} +#endif + +#endif /* __LINUX_USB_ONBOARD_HUB_H */ From patchwork Wed Feb 10 17:10:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12081301 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39569C433DB for ; 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Wed, 10 Feb 2021 09:10:55 -0800 (PST) Received: from localhost ([2620:15c:202:1:d8e6:826a:fc50:2158]) by smtp.gmail.com with UTF8SMTPSA id l25sm2787647pff.105.2021.02.10.09.10.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Feb 2021 09:10:55 -0800 (PST) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: devicetree@vger.kernel.org, Peter Chen , Stephen Boyd , Alan Stern , Ravi Chandra Sadineni , Bastien Nocera , linux-kernel@vger.kernel.org, Douglas Anderson , linux-usb@vger.kernel.org, Krzysztof Kozlowski , Matthias Kaehlcke , Mathias Nyman Subject: [PATCH v5 3/4] usb: host: xhci-plat: Create platform device for onboard hubs in probe() Date: Wed, 10 Feb 2021 09:10:38 -0800 Message-Id: <20210210091015.v5.3.I7a3a7d9d2126c34079b1cab87aa0b2ec3030f9b7@changeid> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210210171040.684659-1-mka@chromium.org> References: <20210210171040.684659-1-mka@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Check during probe() if a hub supported by the onboard_usb_hub driver is connected to the controller. If such a hub is found create the corresponding platform device. This requires the device tree to have a node for the hub with its vendor and product id (which is not common for USB devices). Further the platform device is only created when CONFIG_USB_ONBOARD_HUB=y/m. Signed-off-by: Matthias Kaehlcke --- Changes in v5: - patch added to the series drivers/usb/host/xhci-plat.c | 16 ++++++++++++++++ include/linux/usb/hcd.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 4d34f6005381..e785fa109eea 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -184,6 +185,7 @@ static int xhci_plat_probe(struct platform_device *pdev) int ret; int irq; struct xhci_plat_priv *priv = NULL; + struct device_node *np; if (usb_disabled()) @@ -356,6 +358,17 @@ static int xhci_plat_probe(struct platform_device *pdev) */ pm_runtime_forbid(&pdev->dev); + np = usb_of_get_device_node(hcd->self.root_hub, hcd->self.busnum); + if (np && of_is_onboard_usb_hub(np)) { + struct platform_device *pdev; + + pdev = of_platform_device_create(np, NULL, NULL); + if (pdev) + hcd->onboard_hub_dev = &pdev->dev; + else + xhci_warn(xhci, "failed to create onboard hub platform device\n"); + } + return 0; @@ -402,6 +415,9 @@ static int xhci_plat_remove(struct platform_device *dev) usb_remove_hcd(hcd); usb_put_hcd(shared_hcd); + if (hcd->onboard_hub_dev) + of_platform_device_destroy(hcd->onboard_hub_dev, NULL); + clk_disable_unprepare(clk); clk_disable_unprepare(reg_clk); usb_put_hcd(hcd); diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index 96281cd50ff6..d02a508e19b0 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -225,6 +225,8 @@ struct usb_hcd { * (ohci 32, uhci 1024, ehci 256/512/1024). */ + struct device *onboard_hub_dev; + /* The HC driver's private data is stored at the end of * this structure. */ From patchwork Wed Feb 10 17:10:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12081281 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2770C433E6 for ; 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Wed, 10 Feb 2021 09:11:00 -0800 (PST) Received: from localhost ([2620:15c:202:1:d8e6:826a:fc50:2158]) by smtp.gmail.com with UTF8SMTPSA id f3sm2977494pgh.75.2021.02.10.09.10.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Feb 2021 09:10:58 -0800 (PST) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: devicetree@vger.kernel.org, Peter Chen , Stephen Boyd , Alan Stern , Ravi Chandra Sadineni , Bastien Nocera , linux-kernel@vger.kernel.org, Douglas Anderson , linux-usb@vger.kernel.org, Krzysztof Kozlowski , Matthias Kaehlcke , Andy Gross , Bjorn Andersson , linux-arm-msm@vger.kernel.org Subject: [PATCH v5 4/4] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Date: Wed, 10 Feb 2021 09:10:39 -0800 Message-Id: <20210210091015.v5.4.Ie0d2c1214b767bb5551dd4cad38398bd40e4466f@changeid> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210210171040.684659-1-mka@chromium.org> References: <20210210171040.684659-1-mka@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add nodes for the onboard USB hub on trogdor devices. Remove the 'always-on' and 'boot-on' properties from the hub regulator, since the regulator is now managed by the onboard_usb_hub driver. Signed-off-by: Matthias Kaehlcke --- Changes in v5: - patch added to the series .../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 15 ++++----------- .../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 11 ++--------- arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts | 15 ++++----------- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 18 +++++++++++++++--- 4 files changed, 25 insertions(+), 34 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts index 30e3e769d2b4..a557c269b998 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r0.dts @@ -14,17 +14,6 @@ / { compatible = "google,lazor-rev0", "qcom,sc7180"; }; -&pp3300_hub { - /* pp3300_l7c is used to power the USB hub */ - /delete-property/regulator-always-on; - /delete-property/regulator-boot-on; -}; - -&pp3300_l7c { - regulator-always-on; - regulator-boot-on; -}; - &sn65dsi86_out { /* * Lane 0 was incorrectly mapped on the cable, but we've now decided @@ -33,3 +22,7 @@ &sn65dsi86_out { */ lane-polarities = <1 0>; }; + +&usb_hub_2_0 { + vdd-supply = <&pp3300_l7c>; +}; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r1.dts b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r1.dts index c2ef06367baf..d182b7a231f4 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r1.dts +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor-r1.dts @@ -14,13 +14,6 @@ / { compatible = "google,lazor-rev1", "google,lazor-rev2", "qcom,sc7180"; }; -&pp3300_hub { - /* pp3300_l7c is used to power the USB hub */ - /delete-property/regulator-always-on; - /delete-property/regulator-boot-on; -}; - -&pp3300_l7c { - regulator-always-on; - regulator-boot-on; +&usb_hub_2_0 { + vdd-supply = <&pp3300_l7c>; }; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts b/arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts index 2cb522d6962e..699e7815697a 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts @@ -53,21 +53,14 @@ ap_ts: touchscreen@10 { }; }; -&pp3300_hub { - /* pp3300_l7c is used to power the USB hub */ - /delete-property/regulator-always-on; - /delete-property/regulator-boot-on; -}; - -&pp3300_l7c { - regulator-always-on; - regulator-boot-on; -}; - &sdhc_2 { status = "okay"; }; +&usb_hub_2_0 { + vdd-supply = <&pp3300_l7c>; +}; + /* PINCTRL - board-specific pinctrl */ &tlmm { diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi index 8ed7dd39f6e3..9add00cc32a5 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi @@ -203,9 +203,6 @@ pp3300_hub: pp3300-hub { pinctrl-names = "default"; pinctrl-0 = <&en_pp3300_hub>; - regulator-always-on; - regulator-boot-on; - vin-supply = <&pp3300_a>; }; @@ -894,6 +891,21 @@ &usb_1 { &usb_1_dwc3 { dr_mode = "host"; + #address-cells = <1>; + #size-cells = <0>; + + /* 2.0 hub on port 1 */ + usb_hub_2_0: hub@1 { + compatible = "usbbda,5411"; + reg = <1>; + vdd-supply = <&pp3300_hub>; + }; + + /* 3.0 hub on port 2 */ + usb_hub_3_0: hub@2 { + compatible = "usbbda,411"; + reg = <2>; + }; }; &usb_1_hsphy {