linux-kernel - [PATCH v2 0/2] Allwinner H6 USB3 device tree updates

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Date:   Thu, 29 Apr 2021 22:19:10 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v2 0/2] Allwinner H6 USB3 device tree updates

While implementing support for this USB controller in U-Boot, I noticed
that the reset line alsp affects they PHY. It looks like most platforms
use a separate glue node to represent this, and in fact there is already
a compatible for the H6 listed in drivers/usb/dwc3/dwc3-of-simple.c.

Since this layout matches the usual way of modeling this hardware, it
allows using the existing drivers without adding platform-specific code.


I tried to follow the existing DWC3 glue bindings (most of which are
still .txt). With this version, `make dt_binding_check` still raises a
couple of issues, which I do not know how best to fix:

  - Warning (unit_address_vs_reg): /example-0/usb@...0000: node has a
    unit name, but no reg or ranges property
    => Since there is no MMIO translation, an empty `ranges;` seemed
       appropriate, but it causes this warning.

  - usb@...0000: usb@...0000:phy-names:0: 'usb2-phy' was expected
    => This may be an issue with the snps,dwc3 binding, where the
       `items` list overrides `minItems`. I believe the intention is
       that both PHY references are optional. This implementation has
       only one PHY.

Changes from v1 to v2:
  - Updated the binding to reference the PHY binding by path correctly
  - Dropped DT updates for Pine H64

Samuel Holland (2):
  dt-bindings: usb: Document the Allwinner H6 DWC3 glue
  arm64: dts: allwinner: h6: Wrap DWC3 and PHY in glue layer

 .../usb/allwinner,sun50i-h6-dwc3.yaml         | 75 +++++++++++++++++++
 .../dts/allwinner/sun50i-h6-beelink-gs1.dts   |  6 +-
 .../dts/allwinner/sun50i-h6-orangepi-3.dts    |  6 +-
 .../dts/allwinner/sun50i-h6-tanix-tx6.dts     |  6 +-
 arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi  | 60 ++++++++-------
 5 files changed, 111 insertions(+), 42 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/allwinner,sun50i-h6-dwc3.yaml

-- 
2.26.3