linux-kernel - Re: [PATCH v1 03/12] dt-bindings: misc: Add bindings for HiSilicon usb hub and data role switch functionality on HiKey960

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Date:   Thu, 20 Dec 2018 10:02:58 +0800
From:   Chen Yu <chenyu56@...wei.com>
To:     Rob Herring <robh@...nel.org>
CC:     <liuyu712@...ilicon.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <suzhuangluan@...ilicon.com>, <kongfei@...ilicon.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Mark Rutland <mark.rutland@....com>,
        John Stultz <john.stultz@...aro.org>,
        Binghui Wang <wangbinghui@...ilicon.com>
Subject: Re: [PATCH v1 03/12] dt-bindings: misc: Add bindings for HiSilicon
 usb hub and data role switch functionality on HiKey960



On 2018/12/19 22:21, Rob Herring wrote:
> On Mon, Dec 03, 2018 at 11:45:06AM +0800, Yu Chen wrote:
>> This patch adds binding documentation to support usb hub and usb
>> data role switch of Hisilicon HiKey&HiKey960 Board.
>>
>> Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Cc: John Stultz <john.stultz@...aro.org>
>> Cc: Binghui Wang <wangbinghui@...ilicon.com>
>> Signed-off-by: Yu Chen <chenyu56@...wei.com>
>> --
>> v1:
>> 1) Fix some format errors as suggested by Sergei.
>> 2) Modify gpio description to use gpiod API.
>> --
>> ---
>>  .../bindings/misc/hisilicon-hikey-usb.txt          | 36 ++++++++++++++++++++++
>>  1 file changed, 36 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
>>
>> diff --git a/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
>> new file mode 100644
>> index 000000000000..f3413d851e18
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
>> @@ -0,0 +1,36 @@
>> +Support usb hub and usb data role switch of Hisilicon HiKey&HiKey960 Board.
> 
> s/&/ & /
> 
OK.
> Some trivial comments below, but this all needs to use the USB connector 
> binding for the OTG and host ports and then we need to figure out how 
> the switching fits into that.
> 
>> +
>> +-----------------------------
>> +
>> +Required properties:
>> +- compatible: "hisilicon,gpio-hubv1","hisilicon,hikey960-usb"
>> +- typc-vbus-int-gpio: gpio to control the vbus of typeC port
>> +- typc-vbus-enable-val: gpio value that enable the vbus of typeC port
> 
> HiKey at least doesn't have a TypeC port.
>Yes. I will re-check the driver for Hikey.
>> +- otg-gpio: gpio to switch DP&DM between the hub and typeC port
>> +- hub-vdd33-en-gpio: gpio to enable the power of hub
> 
> -gpios for all these.

OK.
> 
>> +- pinctrl-0: pinctrl config
>> +
>> +Example
>> +-----
>> +
>> +	hisi_hikey_usb: hisi_hikey_usb {
>> +		compatible = "hisilicon,hikey960-usb";
>> +		typec-vbus-gpios = <&gpio25 2 0>;
>> +		typc-vbus-enable-val = <1>;
>> +		otg-switch-gpios = <&gpio25 6 0>;
>> +		hub-vdd33-en-gpios = <&gpio5 6 0>;
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&usbhub5734_pmx_func>;
>> +
>> +		port {
>> +			#address-cells = <1>;
>> +			#size-cells = <0>;
>> +
>> +			hikey_usb_ep: endpoint@0 {
>> +				reg = <0>;
>> +				device_type = "usb-role-switch";
> 
> Drop device_type.

Currently the device_type is used for usb-role-switch match, but it
will be removed after Heikki Krogerus's patch.
> 
>> +				remote-endpoint = <&dwc3_role_switch_notify>;
>> +			};
>> +		};
>> +
>> +	};
>> -- 
>> 2.15.0-rc2
>>
> 
> .
> 
Thanks!