From patchwork Wed Apr 28 18:41:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 12229913 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=-14.0 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 1B0E5C43460 for ; Wed, 28 Apr 2021 18:41:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CCC6A60FDC for ; Wed, 28 Apr 2021 18:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243652AbhD1SmY (ORCPT ); Wed, 28 Apr 2021 14:42:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243654AbhD1SmY (ORCPT ); Wed, 28 Apr 2021 14:42:24 -0400 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3CD8C0613ED for ; Wed, 28 Apr 2021 11:41:38 -0700 (PDT) Received: by mail-pl1-x631.google.com with SMTP id h20so33360591plr.4 for ; Wed, 28 Apr 2021 11:41:38 -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=iWgNLmw8XtUSWX3nXJqs3Lo41Zd8P550K3mKVLVvnf8=; b=Uk1O0BgpnTa9THucVlNuUG2BFbxA/bUsmYfV78MZ2gAji7wuv0Maln71M/8n3/Poie l4ijDJL55PVr0jf3oaNpMKTJKe5FCpfeoNIm0iVaYOcusDLB7qEB0WnnMOpdaFxLXdA2 VfdZEDwS78h/+cG/79kcQ3YxoT/NBXH5dgKUU= 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=iWgNLmw8XtUSWX3nXJqs3Lo41Zd8P550K3mKVLVvnf8=; b=QGT7AsEENHD2pk83BW93aiwTCbLNgRkWE6ZoacBzFtZfJnGA93kDFnyJMtrRj9DFYu ffxe8Ft98Vm6nkHmy/dyomg0Ks/ep7rO9AF597EYvCyARpQEF2sJlNefZ4YoKcxLWWto ywWRdxutqjkya4VDXKaaFKznXikh7qMHFaLxxvOIcINRSJuOQKb/haALedcvXj7Xw0uk 2/b+eQFDLF2+DmVOP+tVLsDRxxPYsGNQI8U5mTNZY1MLkygQ1H5Umc0JZDkKnd1zotc4 UA1reLTa6q5WnnC3zWSXuxQb5n9P5qkmQofSsJZXcvZXzzo2m4NM+54esDdiyhv4uGY7 9VWQ== X-Gm-Message-State: AOAM533fYj/Raj419qbnMsXiP77VSOUU4Aqcsh+0ukkmNRSoIPHf2x5h mUfVikoD1yY/cjAc/eJ02lMMWA== X-Google-Smtp-Source: ABdhPJxKLMnoyUm0OBOXU0x+Ab6uzmJ1QVJbOzIE8+arEaVWVHLVS81tPukqeKbL1icp7BMJa0z5sA== X-Received: by 2002:a17:902:aa98:b029:ec:a55f:f4bc with SMTP id d24-20020a170902aa98b02900eca55ff4bcmr31879072plr.82.1619635298324; Wed, 28 Apr 2021 11:41:38 -0700 (PDT) Received: from localhost ([2620:15c:202:201:4c1a:a0a7:2b43:81b0]) by smtp.gmail.com with UTF8SMTPSA id c13sm5257874pjv.21.2021.04.28.11.41.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Apr 2021 11:41:37 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand Cc: linux-kernel@vger.kernel.org, Ravi Chandra Sadineni , Michal Simek , Bastien Nocera , linux-usb@vger.kernel.org, Douglas Anderson , Krzysztof Kozlowski , Stephen Boyd , devicetree@vger.kernel.org, Peter Chen , Matthias Kaehlcke , Al Cooper , "Alexander A. Klimov" , Andy Gross , Bjorn Andersson , Masahiro Yamada , Mathias Nyman , linux-arm-msm@vger.kernel.org Subject: [PATCH v8 0/5] USB: misc: Add onboard_usb_hub driver Date: Wed, 28 Apr 2021 11:41:27 -0700 Message-Id: <20210428184132.2184997-1-mka@chromium.org> X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-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. (no changes since v7) 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/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, 599 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