From patchwork Wed Feb 10 17:10:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12081289 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=-14.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 CF391C433E0 for ; Wed, 10 Feb 2021 17:11:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7460264DD4 for ; Wed, 10 Feb 2021 17:11:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232068AbhBJRLf (ORCPT ); Wed, 10 Feb 2021 12:11:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231626AbhBJRLa (ORCPT ); Wed, 10 Feb 2021 12:11:30 -0500 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82AC7C0613D6 for ; Wed, 10 Feb 2021 09:10:48 -0800 (PST) Received: by mail-pg1-x530.google.com with SMTP id o38so1628876pgm.9 for ; Wed, 10 Feb 2021 09:10:48 -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:mime-version :content-transfer-encoding; bh=pJV+MEYRICjZ5HpV10ncANYQowHTJOaKXZIikrVEzcc=; b=eBjO8Mp+e0jogy5KAtdpVmCbQT7+E94H38P+/sET318KCwdSa9MYraoeqWiUIUWAdo WTCreNp5joOqR7uA7CDTSDMPkQ7mrJqdJBA6WblNHhppN17B6HCH2cExTi3vUWxxkfJu MPSw+Kk42luJ2FRguWwMopBsZLeKo4/21UTFI= 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:mime-version :content-transfer-encoding; bh=pJV+MEYRICjZ5HpV10ncANYQowHTJOaKXZIikrVEzcc=; b=r8VdijuyF0HuKHktvlAx5hYsZSCh7cImz8baly51euL49PGPIOqGuTOXrk362Ez6Se p2/hePa7mcIa8QK+yvwumJ7l76nip8XfTwlTGFdo7stIgcPb7RIlCE1lT5q6LT6CuwmL dX+HsJiKDDKbEqIwnVBkO5pdgwBWNuoer9j1lAH77HbPmlaukagO24rHWsZlG2PXGPgK DR5wEekaHFeKxkbo7ZwKqkLhb8+rAsqHTRNZFrhb286+Nx5jaomYZRw0crwJ1qIYPS2w sJhKhgQYxBRxkhk+BBjj/GZ9hGdrN1xsqAA5M0rzgUSmrxgw/Mm1lCl1LlA+j4fKbtuN ypDw== X-Gm-Message-State: AOAM530PLTbGS4hPcW02KE5XsPL9fCuNi7Ym3gcluBhWICeIUmKbgGE/ XU0ETC0m6U0P9KHOZl72LEjeaw== X-Google-Smtp-Source: ABdhPJwUpLOFCuA7nZkRLnyPywPsm+Uy2ope7BH7lfMNFNhIZv7LbA3078Lu/PZU9JDAuQw2JUj02g== X-Received: by 2002:a63:fa0b:: with SMTP id y11mr4048388pgh.35.1612977047929; Wed, 10 Feb 2021 09:10:47 -0800 (PST) Received: from localhost ([2620:15c:202:1:d8e6:826a:fc50:2158]) by smtp.gmail.com with UTF8SMTPSA id m25sm2971739pff.77.2021.02.10.09.10.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Feb 2021 09:10:46 -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" , Andy Gross , Bjorn Andersson , Masahiro Yamada , Mathias Nyman , linux-arm-msm@vger.kernel.org Subject: [PATCH v5 0/4] USB: misc: Add onboard_usb_hub driver Date: Wed, 10 Feb 2021 09:10:35 -0800 Message-Id: <20210210171040.684659-1-mka@chromium.org> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This series adds the onboard_usb_hub_driver, the corresponding device tree bindings and creation of onboard_usb_hub platform in the xhci-plat driver during probe(). The main issue the 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. (no changes since v1) Matthias Kaehlcke (4): dt-bindings: usb: Add binding for discrete onboard USB hubs USB: misc: Add onboard_usb_hub driver usb: host: xhci-plat: Create platform device for onboard hubs in probe() arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub .../bindings/usb/onboard_usb_hub.yaml | 49 +++ MAINTAINERS | 7 + .../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 15 +- .../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 11 +- .../arm64/boot/dts/qcom/sc7180-trogdor-r1.dts | 15 +- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 18 +- drivers/usb/host/xhci-plat.c | 16 + drivers/usb/misc/Kconfig | 18 + drivers/usb/misc/Makefile | 1 + drivers/usb/misc/onboard_usb_hub.c | 409 ++++++++++++++++++ include/linux/usb/hcd.h | 2 + include/linux/usb/onboard_hub.h | 15 + 12 files changed, 542 insertions(+), 34 deletions(-) create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml create mode 100644 drivers/usb/misc/onboard_usb_hub.c create mode 100644 include/linux/usb/onboard_hub.h