linux-kernel - Re: [PATCH v3 5/7] dt-bindings: Add Tegra PMC pad configuration bindings

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Date:   Fri, 20 Jul 2018 12:16:04 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Aapo Vienamo <avienamo@...dia.com>, Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] dt-bindings: Add Tegra PMC pad configuration
 bindings

Adding Linus ...

On 17/07/18 16:30, Aapo Vienamo wrote:

...

>>>>> +Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt.
>>>>> +
>>>>> +The values accepted by power-source property are
>>>>> +TEGRA_IO_PAD_VOLTAGE_1V8 and TEGRA_IO_PAD_VOLTAGE_3V3, which are defined
>>>>> +in dt-bindings/pinctrl/pinctrl-tegra-io-pad.h.  
>>>>
>>>> You need to list out what properties the child nodes can have.
>>>>
>>>> power-source needs a vendor prefix.  
>>>
>>> Isn't it a generic pinctrl property?  
>>
>> I don't know offhand. Doesn't look like it if you have custom values.
> 
> It's listed under "Supported generic properties" in
> pinctrl-bindings.txt. The convention seems to be not to add a vendor
> prefix even though such custom macro values are used. The property is
> currently used by qcom,pmic-gpio, qcom,pmic-mpp, and renesas,pfc-pinctrl.
> I could not find a bindings document describing it with a vendor prefix.
Looking at other users of the 'power-source' property it is not clear to
me if the values should/can be vendor specific or not. I see cases where
some people use definitions and others use actual voltages. 

Linus, any recommendations here?

Cheers
Jon	

-- 
nvpublic