linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc7280: Add gpu support

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Message-ID: <CAE-0n5211NZx43Q0UwHJATYYV7zXPH3WWx66808rEmOgSBDQyg@mail.gmail.com>
Date:   Thu, 29 Jul 2021 12:02:14 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Akhil P Oommen <akhilpo@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS 
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        dri-devel@...ts.freedesktop.org,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm@...r.kernel.org
Cc:     Jonathan Marek <jonathan@...ek.ca>, linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Andy Gross <agross@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sc7280: Add gpu support

Quoting Akhil P Oommen (2021-07-29 11:57:23)
> On 7/29/2021 10:46 PM, Stephen Boyd wrote:
> > Quoting Akhil P Oommen (2021-07-28 00:17:45)
> >> On 7/27/2021 5:46 AM, Stephen Boyd wrote:
> >>> Quoting Akhil P Oommen (2021-07-24 10:29:00)
> >>>> Add the necessary dt nodes for gpu support in sc7280.
> >>>>
> >>>> Signed-off-by: Akhil P Oommen <akhilpo@...eaurora.org>
> >>>> ---
> >>>> This patch has dependency on the GPUCC bindings patch here:
> >>>> https://patchwork.kernel.org/project/linux-arm-msm/patch/1619519590-3019-4-git-send-email-tdas@codeaurora.org/
> >>>
> >>> To avoid the dependency the plain numbers can be used.
> >>
> >> But, won't that reduce readability and make things prone to error?
> >
> > The numbers are not supposed to change so maybe it reduces readability
> > but I don't see how it is prone to error.
>
> I cross check GPU's clock list whenever there is a system level issue
> like NoC errors. So it is convenient to have the clock names here, at
> least for me. But, I will budge if it is not easy to manage the dependency.

To clarify my statement, the defines can be used eventually once the
header file is part of the same tree. A duplicate patch between clk and
qcom trees is fine or pulling in the clk branch works too.

>
> >
> >> If
> >> the other patch doesn't get picked up soon, we should try this option.
> >> We like to get this patch merged in v5.15.
> >
> > The clk binding is already picked up but Bjorn would need to merge it
> > into the qcom tree to use it. I don't know what the plan is there.
> >
>
> Bjorn, could you please advise here?
>
> -Akhil.