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: 431075 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=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 9353DC433ED for ; Mon, 3 May 2021 19:44:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F436610A1 for ; Mon, 3 May 2021 19:44:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229641AbhECTpj (ORCPT ); Mon, 3 May 2021 15:45:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229472AbhECTph (ORCPT ); Mon, 3 May 2021 15:45:37 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24B33C06174A for ; Mon, 3 May 2021 12:44:44 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id h7so3452809plt.1 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=uJQOMy7MCAbk+fiVauJsnVs3v6hxMn10/MQpegFYJY/PqgqXi7Ha61DRUTVZMLjR0C gx3V5d+XaTzFNfkz1KlLvfqpYlipgbFRk//GcmCOQuKCr67RisLwp9aivCfzXB8at4M6 WSXYLz4lPUYhAU5gXYs6c/Z/aQ8SV1lUuEJdiMGhJMUfJHCZ/Y+DRxoHRpeblvwfjF1P 23Ql6ZSbKUBFzEHzmguWIYOrdLLYRy9FKRGveHkB+Fyoh+EXSHI6tMKzzPc1x9jJBn85 /i5v+TbcoVVImmeDgcAC9LIw7Kv7DLAymQ3ffX9qERmmukNe2NNtLforjIvCBdTxpT3A iUTA== X-Gm-Message-State: AOAM531+pPcdciBFoARmxIW4lOzfsupHZF/3MZKwHLUYSVE2K7qZ8qC0 k3XEgKrvEe5t+C7mjdEdETnHGA== 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-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 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