linux-kernel - Re: [RFC][PATCH v2 4/5] dt-bindings: usb: dwc3: of-simple: add compatible for HiSi

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Date:   Mon, 7 Oct 2019 13:38:20 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Yu Chen <chenyu56@...wei.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [RFC][PATCH v2 4/5] dt-bindings: usb: dwc3: of-simple: add
 compatible for HiSi

On Mon, Oct 7, 2019 at 12:56 PM John Stultz <john.stultz@...aro.org> wrote:
>
> Add necessary compatible flag for HiSi's DWC3 so
> dwc3-of-simple will probe.
>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Yu Chen <chenyu56@...wei.com>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Cc: linux-usb@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
> v2: Tweaked clock names as clk_usb3phy_ref didn't seem right.
> ---
>  .../devicetree/bindings/usb/hisi,dwc3.txt     | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/hisi,dwc3.txt

Can you make this a schema.

> diff --git a/Documentation/devicetree/bindings/usb/hisi,dwc3.txt b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> new file mode 100644
> index 000000000000..3a3e5c320f2a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> @@ -0,0 +1,52 @@
> +HiSi SuperSpeed DWC3 USB SoC controller
> +
> +Required properties:
> +- compatible:          should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> +- clocks:              A list of phandle + clock-specifier pairs for the
> +                       clocks listed in clock-names
> +- clock-names:         Should contain the following:
> +  "clk_abb_usb"                USB reference clk
> +  "aclk_usb3otg"       USB3 OTG aclk
> +
> +- assigned-clocks:     Should be:
> +                               HI3660_ACLK_GATE_USB3OTG
> +- assigned-clock-rates: Should be:
> +                               229Mhz (229000000) for HI3660_ACLK_GATE_USB3OTG
> +
> +Optional properties:
> +- resets:              Phandle to reset control that resets core and wrapper.

Looks like 4 resets though.

> +
> +Required child node:
> +A child node must exist to represent the core DWC3 IP block. The name of
> +the node is not important. The content of the node is defined in dwc3.txt.
> +
> +Example device nodes:
> +
> +       usb3: hisi_dwc3 {
> +               compatible = "hisilicon,hi3660-dwc3";
> +               #address-cells = <2>;
> +               #size-cells = <2>;
> +               ranges;
> +
> +               clocks = <&crg_ctrl HI3660_CLK_ABB_USB>,
> +                        <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +               clock-names = "clk_abb_usb", "aclk_usb3otg";
> +
> +               assigned-clocks = <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +               assigned-clock-rates = <229 000 000>;
> +               resets = <&crg_rst 0x90 8>,
> +                        <&crg_rst 0x90 7>,
> +                        <&crg_rst 0x90 6>,
> +                        <&crg_rst 0x90 5>;
> +
> +               dwc3: dwc3@...00000 {

If it's only clocks and resets for the wrapper node, just make this
all one node.

And 'usb3' for the node name.

> +                       compatible = "snps,dwc3";
> +                       reg = <0x0 0xff100000 0x0 0x100000>;
> +                       interrupts = <0 159 4>, <0 161 4>;
> +                       phys = <&usb_phy>;
> +                       phy-names = "usb3-phy";
> +                       dr_mode = "otg";
> +
> +                       ...
> +               };
> +       };
> --
> 2.17.1
>