linux-kernel - Re: [PATCH v8 42/42] ARM: dts: da850: Add clocks

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Date:   Tue, 3 Apr 2018 11:13:07 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     David Lechner <david@...hnology.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Adam Ford <aford173@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 42/42] ARM: dts: da850: Add clocks

On Monday 02 April 2018 09:45 PM, David Lechner wrote:
> On 04/02/2018 06:12 AM, Sekhar Nori wrote:
>> On Friday 16 March 2018 10:50 PM, David Lechner wrote:
>>> On 03/15/2018 09:52 PM, David Lechner wrote:
>>>> This adds clock provider nodes for da850 and wires them up to all of
>>>> the
>>>> devices.
>>>>
>>>> Signed-off-by: David Lechner <david@...hnology.com>
>>>> ---
>>>
>>> ...
>>>
>>> This is the mcasp0: mcasp@...000 node...
>>>
>>>> @@ -560,6 +720,7 @@
>>>>                dmas = <&edma0 1 1>,
>>>>                    <&edma0 0 1>;
>>>>                dma-names = "tx", "rx";
>>>> +            clocks = <&psc1 7>;
>>>
>>> After some testing, it looks like it needs to be:
>>>
>>> +            power-domains = <&psc1 7>;
>>>
>>> instead of
>>>
>>> +            clocks = <&psc1 7>;
>>
>> We should probably have both clocks and power-domains properties for all
>> PSC clocks. This way, the driver can change without a corresponding DT
>> update dependency.
>>
>> Thanks,
>> Sekhar
>>
> 
> That's fine with me. I just didn't know how people felt about using
> properties
> that are not documented.

Good point. How to ease documentation for generic properties like these
was discussed in the past, but there is no guidance in
Documentation/devicetree/bindings that I can see.

So, in the interest of reduced controversy, its probably better to do
what you already have and only populate properties already documented in
the bindings.

Thanks,
Sekhar