linux-kernel - Re: [PATCH v2 1/5] dt-bindings: gpu: add bindings for the ARM Mali Midgard GPU

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Message-ID: <32edad9f-a568-c67d-060d-055517d6782f@collabora.com>
Date:   Mon, 24 Apr 2017 11:43:52 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Mark Rutland <mark.rutland@....com>,
        Sjoerd Simons <sjoerd.simons@...labora.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        John Reitan <john.reitan@....com>,
        Wookey <wookey@...kware.org>, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: gpu: add bindings for the ARM Mali
 Midgard GPU

On 18/04/17 10:15, Guillaume Tucker wrote:
> Hi Rob,
>
> On 04/04/17 03:00, Rob Herring wrote:
>> On Sun, Apr 02, 2017 at 08:59:44AM +0100, Guillaume Tucker wrote:

>>> +- operating-points : Refer to Documentation/devicetree/bindings/power/opp.txt
>>> +  for details.
>>
>> Is this going to be sufficient vs. operating-points-v2? Or should it be
>> a power domain with OPPs?
>
> In principle, switching to operating-points-v2 should be very
> straightforward.  I have smoke-tested the driver with an
> operating-points-v2 table and a phandle to it inside the gpu node
> in place of operating-points and it seems to be working fine.  At
> least it parsed the OPPs and got initialised correctly.
>
> My understanding is that operating-points (v1) are not deprecated
> so we could keep the bindings as-is, but please let me know
> otherwise and I can try to address that in my next patch version.
> In the documentation, it should only be the case of replacing
> operating-points with operating-points-v2.

While the opp bindings documentation doesn't mention anything
about operating-points being deprecated, the code and comments in
of.c are pretty clear about this:

	/*
	 * OPPs have two version of bindings now. The older one is deprecated,
	 * try for the new binding first.
	 */

So I shall use operating-points-v2 in my patch v4.

Thanks,
Guillaume