From patchwork Fri Mar 5 19:38:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 394814 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=-13.8 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=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 A8418C43331 for ; Fri, 5 Mar 2021 19:39:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 88D0F650BB for ; Fri, 5 Mar 2021 19:39:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229788AbhCETjJ (ORCPT ); Fri, 5 Mar 2021 14:39:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229829AbhCETjA (ORCPT ); Fri, 5 Mar 2021 14:39:00 -0500 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F04BC061762 for ; Fri, 5 Mar 2021 11:39:00 -0800 (PST) Received: by mail-pj1-x1032.google.com with SMTP id i14so2465038pjz.4 for ; Fri, 05 Mar 2021 11:39:00 -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=LG9oyAMtJgx3MZnF1cjNx0Z73nyJ3bl+UDBONgUWEek=; b=ggOIM+SG40FpYO7nKWVXfsxUahWUDooTMRZxn5l7gTA+HO/Oshx+xFI2gJm8FjGFWd yMO+6a4sKQ33MZPPDgF876Qspmsq41SzfPC/U+EkXbRZT8Zkft54CY+9UkImiYl134kk OFr4e0tyCp9zZaaDPh2DcKIA2ZE1YKPtxO9Ao= 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=LG9oyAMtJgx3MZnF1cjNx0Z73nyJ3bl+UDBONgUWEek=; b=kxGAfxCkcEHlPL7AK/UVAfkJCnYL48y8T5FipbLT9mGuZtqCQg4xW/xH3IWY7SrJjw 26L1jwH68Ki+LJH4o22PAypceGmAwtJxGcaTHjshBnoEzDfZoEOKnOjHgHklRVOcQYAX RxoRvMjdVqNqGplTs8WZbkHu2Mg/eyGnCef3NEljWHo8QgRiDTXNwBbVA26x7925CHfR WyJTnNurPPz4KNnA4eQKRy0Gs4Z7zZZROZF87lQpTQQ7r0K2HAerpdJddKFtV6OavF0/ PEArmmQAfdf0Qk0IlmKvhtp4ZyazHIOXtvXKeXtemL8p6jtzLf89ZDxGvuOqEnCg87sJ HKBQ== X-Gm-Message-State: AOAM531E7FM67l93G7BuSJ5xafRcOmT9kpL5b9QUNrmk8a8JViW+HU64 950EkmOvaWn3a9VTJ6JKVOTuYA== X-Google-Smtp-Source: ABdhPJwEqqVsUn2z3JJUJIjh06VPSNzyrfBYQ53qJrtc/OUW5yoK9NJOztaUq6/kipxliMh2j0bnsg== X-Received: by 2002:a17:90a:7d05:: with SMTP id g5mr11477597pjl.173.1614973139627; Fri, 05 Mar 2021 11:38:59 -0800 (PST) Received: from localhost ([2620:15c:202:1:2878:25d1:94cb:a547]) by smtp.gmail.com with UTF8SMTPSA id o13sm3355640pfp.26.2021.03.05.11.38.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Mar 2021 11:38:59 -0800 (PST) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand Cc: Ravi Chandra Sadineni , Peter Chen , Michal Simek , Stephen Boyd , linux-kernel@vger.kernel.org, Bastien Nocera , linux-usb@vger.kernel.org, Douglas Anderson , devicetree@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 v6 0/5] USB: misc: Add onboard_usb_hub driver Date: Fri, 5 Mar 2021 11:38:48 -0800 Message-Id: <20210305193853.2040456-1-mka@chromium.org> X-Mailer: git-send-email 2.30.1.766.gb4fecdf3b7-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@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 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 | 58 +++ 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 | 15 +- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 21 +- 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 + 14 files changed, 593 insertions(+), 34 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