linux-kernel - Re: [PATCH 2/3] dt-bindings: Document Renesas R-Car FCP power-domains usage

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Date:	Fri, 10 Jun 2016 21:11:25 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Rob Herring <robh@...nel.org>
Cc:	Kieran Bingham <kieran@...uared.org.uk>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"open list:MEDIA DRIVERS FOR RENESAS - FCP" 
	<linux-media@...r.kernel.org>,
	"open list:MEDIA DRIVERS FOR RENESAS - FCP" 
	<linux-renesas-soc@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: Document Renesas R-Car FCP power-domains usage

Hi Rob,

On Fri, Jun 10, 2016 at 7:39 PM, Rob Herring <robh@...nel.org> wrote:
> On Thu, Jun 09, 2016 at 02:41:33PM +0100, Kieran Bingham wrote:
>> The power domain must be specified to bring the device out of module
>> standby. Document this in the example provided, so that new additions
>> are not missed.
>>
>> Signed-off-by: Kieran Bingham <kieran@...gham.xyz>
>> ---
>>  Documentation/devicetree/bindings/media/renesas,fcp.txt | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/media/renesas,fcp.txt b/Documentation/devicetree/bindings/media/renesas,fcp.txt
>> index 271dcfdb5a76..6a55f5215221 100644
>> --- a/Documentation/devicetree/bindings/media/renesas,fcp.txt
>> +++ b/Documentation/devicetree/bindings/media/renesas,fcp.txt
>> @@ -31,4 +31,5 @@ Device node example
>>               compatible = "renesas,r8a7795-fcpv", "renesas,fcpv";
>>               reg = <0 0xfea2f000 0 0x200>;
>>               clocks = <&cpg CPG_MOD 602>;
>> +             power-domains = <&sysc R8A7795_PD_A3VP>;
>
> This needs to be documented above too, not just the example.

Why? Power domains are an optional feature, whose presence depends
on the platform, not on the device.

Hence "power-domains" properties may appear in any device node.
Having to document them in every single binding document is overkill.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds