linux-kernel - Re: [PATCH 2/6] dt-bindings: display: msm: gmu: add optional ocmem property

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Date:   Wed, 19 Jun 2019 14:16:57 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Marek <jonathan@...ek.ca>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/6] dt-bindings: display: msm: gmu: add optional ocmem property

On Sun, Jun 16, 2019 at 7:29 AM Brian Masney <masneyb@...tation.org> wrote:
>
> Some A3xx and A4xx Adreno GPUs do not have GMEM inside the GPU core and
> must use the On Chip MEMory (OCMEM) in order to be functional. Add the
> optional ocmem property to the Adreno Graphics Management Unit bindings.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>
> ---
>  Documentation/devicetree/bindings/display/msm/gmu.txt | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/msm/gmu.txt b/Documentation/devicetree/bindings/display/msm/gmu.txt
> index 90af5b0a56a9..c746b95e95d4 100644
> --- a/Documentation/devicetree/bindings/display/msm/gmu.txt
> +++ b/Documentation/devicetree/bindings/display/msm/gmu.txt
> @@ -31,6 +31,10 @@ Required properties:
>  - iommus: phandle to the adreno iommu
>  - operating-points-v2: phandle to the OPP operating points
>
> +Optional properties:
> +- ocmem: phandle to the On Chip Memory (OCMEM) that's present on some Snapdragon
> +         SoCs. See Documentation/devicetree/bindings/soc/qcom/qcom,ocmem.yaml.

We already have a couple of similar properties. Lets standardize on
'sram' as that is what TI already uses.

Also, is the whole OCMEM allocated to the GMU? If not you should have
child nodes to subdivide the memory.

Rob