linux-kernel - Re: [PATCH 1/6] ARM: dts: vf610: add USB PHY and controller

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Date:	Tue, 22 Jul 2014 11:57:31 +0200
From:	Stefan Agner <stefan@...er.ch>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	peter.chen@...escale.com, s.hauer@...gutronix.de,
	b35083@...escale.com, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] ARM: dts: vf610: add USB PHY and controller

Am 2014-07-22 04:22, schrieb Shawn Guo:
> On Fri, Jul 18, 2014 at 07:01:37PM +0200, Stefan Agner wrote:
>> This adds USB PHY and USB controller nodes. Vybrid SoCs have two
>> independent USB cores which each supports DR (dual role). However,
>> real OTG is not supported since the OTG ID pin is not available.
>>
>> The PHYs are located within the anadig register range, hence we need
>> to change the length of the anadig registers.
>>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
>> ---
>>  arch/arm/boot/dts/vf610.dtsi | 46 +++++++++++++++++++++++++++++++++++++++++---
>>  1 file changed, 43 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/vf610.dtsi b/arch/arm/boot/dts/vf610.dtsi
>> index 6a6190c..f6c3f02 100644
>> --- a/arch/arm/boot/dts/vf610.dtsi
>> +++ b/arch/arm/boot/dts/vf610.dtsi
>> @@ -25,6 +25,8 @@
>>  		gpio2 = &gpio3;
>>  		gpio3 = &gpio4;
>>  		gpio4 = &gpio5;
>> +		usbphy0 = &usbphy0;
>> +		usbphy1 = &usbphy1;
>>  	};
>>
>>  	cpus {
>> @@ -285,9 +287,25 @@
>>  				gpio-ranges = <&iomuxc 0 128 7>;
>>  			};
>>
>> -			anatop@...50000 {
>> -				compatible = "fsl,vf610-anatop";
>> -				reg = <0x40050000 0x1000>;
>> +			anatop: anatop@...50000 {
>> +				compatible = "fsl,vf610-anatop", "syscon";
>> +				reg = <0x40050000 0x400>;
>> +			};
>> +
>> +			usbphy0: usbphy@...50800 {
>> +				compatible = "fsl,vf610-usbphy", "fsl,imx23-usbphy";
> 
> Since phy driver will match "fsl,vf610-usbphy" anyway, we do not need
> "fsl,imx23-usbphy" here.

<snip>

>> @@ -309,6 +327,18 @@
>>  				reg = <0x4006b000 0x1000>;
>>  				#clock-cells = <1>;
>>  			};
>> +
>> +			usbdev0: usb@...34000 {
>> +				compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
> 
> It doesn't really make any sense to have "fsl,imx6q-usb" here.  The
> following one should be less confusing.
> 
> 	compatible = "fsl,vf610-usb", "fsl,imx27-usb";


I don't quite understand the rule here, when do we drop compatible you
suggest in fsl,imx23-usbphy and when do we keep the "fallback" as we do
for the USB controller?

Documentation/devicetree/bindings/usb/mxs-phy.txt says:
> "fsl,imx23-usbphy" is still a fallback for other strings


And Documentation/devicetree/bindings/usb/ci-hdrc-imx.txt says:
> - compatible: Should be "fsl,imx27-usb"

--
Stefan

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