linux-kernel - [PATCH v2 0/5] arm64: meson: support Amlogic A1 USB OTG controller

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Date:   Tue, 18 Apr 2023 14:16:07 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <neil.armstrong@...aro.org>,
        <khilman@...libre.com>, <jbrunet@...libre.com>,
        <martin.blumenstingl@...glemail.com>, <mturquette@...libre.com>,
        <vkoul@...nel.org>, <kishon@...nel.org>, <hminas@...opsys.com>,
        <Thinh.Nguyen@...opsys.com>
CC:     <yue.wang@...ogic.com>, <hanjie.lin@...ogic.com>,
        <kernel@...rdevices.ru>, <rockosov@...il.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>,
        Dmitry Rokosov <ddrokosov@...rdevices.ru>
Subject: [PATCH v2 0/5] arm64: meson: support Amlogic A1 USB OTG controller

This patch series introduces full support for the Amlogic A1 USB controller
in OTG mode (peripheral and host modes switching).

Previously, Amlogic's patch series [1] was applied to the upstream tree,
but it only had USB host mode support.
Furthermore, the device tree patchset [2] wasn't merged due to a missing
clk driver.
Patchset [2] has been completely reworked:
    - changed register base offsets to proper values
    - introduced dwc2 in peripheral mode
    - OTG mode support
    - the SoB of Amlogic authors still remain

Testing:
    - USB OTG role switching between gadget and host - OK
    - Peripheral mode - OK (tested with adb shell/push/pop)
    - Host mode - OK (tested only USB enumeration and detection)

Changes v2 since v1 at [3]:
    - as Martin suggested in v1, this commit completely removes
      the 'otg_switch_supported' parameter from dwc3_meson_g12a_drvdata;
      this parameter is no longer necessary as all IP versions now
      support OTG switching
    - this commit moves the USB PHY clkin enable/disable calls to
      the PHY init/exit routines

Links:
    [1] https://lore.kernel.org/all/1581990859-135234-1-git-send-email-hanjie.lin@amlogic.com/
    [2] https://lore.kernel.org/all/1581990859-135234-4-git-send-email-hanjie.lin@amlogic.com/
    [3] https://lore.kernel.org/all/20230414152423.19842-1-ddrokosov@sberdevices.ru/

Dmitry Rokosov (5):
  phy: amlogic: enable/disable clkin during Amlogic USB PHY init/exit
  usb: dwc2: support dwc2 IP for Amlogic A1 SoC family
  dt-bindings: usb: dwc2: add support for Amlogic A1 SoC USB peripheral
  usb: dwc3-meson-g12a: support OTG switch for all IP versions
  arm64: dts: meson: a1: support USB controller in OTG mode

 .../devicetree/bindings/usb/dwc2.yaml         |  1 +
 arch/arm64/boot/dts/amlogic/meson-a1.dtsi     | 59 +++++++++++++++++++
 drivers/phy/amlogic/phy-meson-g12a-usb2.c     | 13 +++-
 drivers/usb/dwc2/params.c                     | 21 +++++++
 drivers/usb/dwc3/dwc3-meson-g12a.c            | 16 +----
 5 files changed, 95 insertions(+), 15 deletions(-)

-- 
2.36.0