linux-kernel - Re: [PATCH v1 01/12] dt-bindings: usb: add support for dwc3 controller on HiSilicon SoCs

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Date:   Mon, 3 Dec 2018 17:28:56 +0800
From:   Chen Yu <chenyu56@...wei.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <wangbinghui@...ilicon.com>, <suzhuangluan@...ilicon.com>,
        <kongfei@...ilicon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "John Stultz" <john.stultz@...aro.org>
Subject: Re: [PATCH v1 01/12] dt-bindings: usb: add support for dwc3
 controller on HiSilicon SoCs

Hi,

On 2018/12/3 16:59, Sergei Shtylyov wrote:
> On 03.12.2018 11:51, Chen Yu wrote:
> 
>>>> This patch adds binding descriptions to support the dwc3 controller
>>>> on HiSilicon SoCs and boards like the HiKey960.
>>>>
>>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>>> Cc: Rob Herring <robh+dt@...nel.org>
>>>> Cc: Mark Rutland <mark.rutland@....com>
>>>> Cc: John Stultz <john.stultz@...aro.org>
>>>> Signed-off-by: Yu Chen <chenyu56@...wei.com>
>>>> ---
>>>>    .../devicetree/bindings/usb/dwc3-hisi.txt          | 67 ++++++++++++++++++++++
>>>>    1 file changed, 67 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/usb/dwc3-hisi.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/usb/dwc3-hisi.txt b/Documentation/devicetree/bindings/usb/dwc3-hisi.txt
>>>> new file mode 100644
>>>> index 000000000000..d32d2299a0a1
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/usb/dwc3-hisi.txt
>>>> @@ -0,0 +1,67 @@
>>>> +HiSilicon DWC3 USB SoC controller
>>>> +
>>>> +This file documents the parameters for the dwc3-hisi driver.
>>>> +
>>>> +Required properties:
>>>> +- compatible:    should be "hisilicon,hi3660-dwc3"
>>>> +- clocks:    A list of phandle + clock-specifier pairs for the
>>>> +        clocks listed in clock-names
>>>> +- clock-names:    Specify clock names
>>>> +- resets:    list of phandle and reset specifier pairs.
>>>> +
>>>> +Sub-nodes:
>>>> +The dwc3 core should be added as subnode to HiSilicon DWC3 as shown in the
>>>> +example below. The DT binding details of dwc3 can be found in:
>>>> +Documentation/devicetree/bindings/usb/dwc3.txt
>>>> +
>>>> +Example:
>>>> +    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_usb3phy_ref", "aclk_usb3otg";
>>>> +        assigned-clocks = <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
>>>> +        assigned-clock-rates = <229000000>;
>>>> +        resets = <&crg_rst 0x90 8>,
>>>> +             <&crg_rst 0x90 7>,
>>>> +             <&crg_rst 0x90 6>,
>>>> +             <&crg_rst 0x90 5>;
>>>> +
>>>> +        dwc3: dwc3@...00000 {
>>>
>>>      According to the DT spec, the node names should be generic, not chip specific, i.e. usb@...00000 in this case.
>>>
>>
>> Do you mean it should be usb@...00000: dwc3@...00000 ?
> 
>     dwc3: usb@...00000
> 
>    "dwc3:" is a label, not name.

I use the node name "dwc3@...00000" according to Documentation/devicetree/bindings/usb/dwc3.txt
and documentations of vendor drivers, i.e. qcom,dwc3.txt, rockchip,dwc3.txt.

In these documentations, the dwc3 sub-node name uses "dwc3@...xxxxx".

I think it is better to be same as the other vendor's dwc3 drivers.
> 
>> Thanks!
>>
>>> [...]
> 
> MBR, Sergei
> 
> .
>