From patchwork Mon May 3 19:44:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12236893 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=-14.4 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 4B8D0C433B4 for ; Mon, 3 May 2021 19:44:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 17CFD610A1 for ; Mon, 3 May 2021 19:44:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229590AbhECTpi (ORCPT ); Mon, 3 May 2021 15:45:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229570AbhECTph (ORCPT ); Mon, 3 May 2021 15:45:37 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25C41C061763 for ; Mon, 3 May 2021 12:44:44 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id s20so3426359plr.13 for ; Mon, 03 May 2021 12:44:44 -0700 (PDT) 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=5n7PRrkxFyYY/DUpP4RV9Z9dMh8zqGU+uSvPh8xSPyk=; b=OUOflD4NStTCK/6H2DEIARGnIGZAmcL/Z72NN4loGh0CSVLyx/bMPq/3ahPBAL0JS+ 0GkyafMf6uMX382ZzdPCDy3i5tneU/8PkXEIChz5+kkKqziuu93p2NRxv+nQ7TVp0jOS JrSBoFHkgTPZJKCJqgf6uoXk15UL5v9xpHsy8= 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=5n7PRrkxFyYY/DUpP4RV9Z9dMh8zqGU+uSvPh8xSPyk=; b=taGNHeMFfzfpwIaB5tXUl3oR1W129J7yzgVJ/2TT51K8OXx67N3TLeeXFhfIEtLzro pq1lNglZ43eZCKm8PBoKpHx3sgDYcaPxPnq8/07B66ZHwnlJ8qag4bwGEN1arNMgaxzv B+HgsB4rsndEeg2YPToqq/HyTbkNiI//WmrEMnQJe9XeLsV253iVJWcswgk/zJJkY90j XO73N270q3USynKI0NMuBKuokvUG1NBIAtuBFRJDHOFIeFMMKfRhzncge21fALqhBBa3 JvpLVHsN9jwwBq+NGh9l+JOiD4/1C4ww5xVKBxgxesNxVuMKo2F/UnzPO/tibiTXnh1f cQzA== X-Gm-Message-State: AOAM5303YEQpVN5BnHA//q3ZDdqe92oz/E9tkc/5HpnS5UyoZQp/1v8H WDWX2pqURKjC59HFrkZjeF6xhQ== X-Google-Smtp-Source: ABdhPJySStTfI0medBoSVcDYbV74l0ZWhhmSx+mPrsDib5O667sC85u598aJHGyb0VWPBevldrq0Mg== X-Received: by 2002:a17:902:b18c:b029:ed:631f:63ca with SMTP id s12-20020a170902b18cb02900ed631f63camr22320772plr.40.1620071083748; Mon, 03 May 2021 12:44:43 -0700 (PDT) Received: from localhost ([2620:15c:202:201:8584:3fd:2adf:a655]) by smtp.gmail.com with UTF8SMTPSA id k15sm10309033pfi.0.2021.05.03.12.44.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 May 2021 12:44:43 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand Cc: Peter Chen , Bastien Nocera , linux-usb@vger.kernel.org, Stephen Boyd , Ravi Chandra Sadineni , Douglas Anderson , devicetree@vger.kernel.org, Krzysztof Kozlowski , linux-kernel@vger.kernel.org, Michal Simek , Matthias Kaehlcke , Al Cooper , "Alexander A. Klimov" , Andy Gross , Bjorn Andersson , Christian Lamparter , Dmitry Osipenko , Fabio Estevam , Masahiro Yamada , Mathias Nyman , Vinod Koul , linux-arm-msm@vger.kernel.org Subject: [PATCH v9 0/5] USB: misc: Add onboard_usb_hub driver Date: Mon, 3 May 2021 12:44:34 -0700 Message-Id: <20210503194439.3289065-1-mka@chromium.org> X-Mailer: git-send-email 2.31.1.527.g47e6f16901-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 - glue in the xhci-plat driver to create the onboard_usb_hub platform device if needed - a device tree binding for the Realtek RTS5411 USB hub controller - device tree changes that add RTS5411 entries for the QCA SC7180 based boards trogdor and lazor - a couple of stubs for platform device functions to avoid unresolved symbols with certain kernel configs 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. Changes in v9: - added dependency on ONBOARD_USB_HUB (or !!ONBOARD_USB_HUB) to USB_PLATFORM_XHCI Changes in v7: - updated DT binding - series rebased on qcom/arm64-for-5.13 Changes in v6: - updated summary Changes in v5: - cover letter added Matthias Kaehlcke (5): dt-bindings: usb: Add binding for Realtek RTS5411 hub controller USB: misc: Add onboard_usb_hub driver of/platform: Add stubs for of_platform_device_create/destroy() usb: host: xhci-plat: Create platform device for onboard hubs in probe() arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub .../sysfs-bus-platform-onboard-usb-hub | 8 + .../bindings/usb/realtek,rts5411.yaml | 62 +++ MAINTAINERS | 7 + .../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 19 +- .../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 11 +- .../arm64/boot/dts/qcom/sc7180-trogdor-r1.dts | 19 +- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 21 +- drivers/usb/host/Kconfig | 1 + drivers/usb/host/xhci-plat.c | 16 + drivers/usb/misc/Kconfig | 17 + drivers/usb/misc/Makefile | 1 + drivers/usb/misc/onboard_usb_hub.c | 415 ++++++++++++++++++ include/linux/of_platform.h | 22 +- include/linux/usb/hcd.h | 2 + include/linux/usb/onboard_hub.h | 15 + 15 files changed, 600 insertions(+), 36 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub create mode 100644 Documentation/devicetree/bindings/usb/realtek,rts5411.yaml create mode 100644 drivers/usb/misc/onboard_usb_hub.c create mode 100644 include/linux/usb/onboard_hub.h