From patchwork Mon Apr 5 20:18:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12183535 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 7954FC433ED for ; Mon, 5 Apr 2021 20:18:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E847613BC for ; Mon, 5 Apr 2021 20:18:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240639AbhDEUS3 (ORCPT ); Mon, 5 Apr 2021 16:18:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234602AbhDEUS2 (ORCPT ); Mon, 5 Apr 2021 16:18:28 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2ADD0C061788 for ; Mon, 5 Apr 2021 13:18:22 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id b17so5167776pgh.7 for ; Mon, 05 Apr 2021 13:18:22 -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=SzrATsd1l9iJ+1jsAg78YWOp1Uycls09AoxwwnTVB0A=; b=cStO9sTfmivqiIsV8Qp4UfOSoFmcFgIkbfywRSltUsIJ4YxU8IySZexr/4fUvjfTol YZ3nkdl9vO4T18y1DMIyR0rIUn2ZerL7H8kht1d7ljOJDhS9UbqqVz4tv9iycp+sP4Rx 15MC+yEIeazbFqlrW1o88SgNWPXwsL/3VXfnw= 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=SzrATsd1l9iJ+1jsAg78YWOp1Uycls09AoxwwnTVB0A=; b=JR9tdsGGmG5aUz4p3J62DLxxvo4h98C7giLJ17ygcka3Hfha2hIn5w2iZ/sT4xqZCa XfuVZQWURNZiJA5lPSO3CTczVYq351gh9A8nRUQUVvfgMwqGPQYViklTECx0/hvEPYMf dDpkW2G2nNC0nu/w9Ftcxk68jqmAqrYvGmzqKcS8jM6tp3ElhxdeC0Y17m667ZGKngex h9Xw49nzOIZLb59FgUIP1NOCKSBczqwNOUah+8WijnMMJ3BlUAMO4Ifss/MjNZ9vVXYq ECxYeVBZn9qOaUtIZkXWKe7f72Up3hS1C08psyxCSS09V8UKqE6ZbW0DcYMhxk+PeqcO Dl/A== X-Gm-Message-State: AOAM532aLrUt/hncPDjfVg7n8noPjCoGyYKqzWNmW81dev5YFYRMPfvo jbLe7sfyBdJqZpCPHIGr85mKXQ== X-Google-Smtp-Source: ABdhPJzIGqAKrxzPOvps82jXYzrKweSAvuxLkVluJX5klP+J3JDb3KVgihZcPP9Xit3jNjHcaDBMCw== X-Received: by 2002:aa7:8a19:0:b029:1f6:6839:7211 with SMTP id m25-20020aa78a190000b02901f668397211mr24475341pfa.40.1617653901576; Mon, 05 Apr 2021 13:18:21 -0700 (PDT) Received: from localhost ([2620:15c:202:201:455e:b8cf:5939:67da]) by smtp.gmail.com with UTF8SMTPSA id x125sm16240244pfd.124.2021.04.05.13.18.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Apr 2021 13:18:21 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand Cc: linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Douglas Anderson , Peter Chen , Michal Simek , linux-usb@vger.kernel.org, Ravi Chandra Sadineni , Bastien Nocera , devicetree@vger.kernel.org, Stephen Boyd , 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: Mon, 5 Apr 2021 13:18:12 -0700 Message-Id: <20210405201817.3977893-1-mka@chromium.org> X-Mailer: git-send-email 2.31.0.208.g409f899ff0-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 v7: - 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 | 59 +++ 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/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, 596 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