linux-kernel - Re: [PATCH v2 1/4] dt-bindings: drm/msm/gpu: document second interconnect

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Date:   Wed, 11 Dec 2019 23:14:22 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     robdclark@...il.com, sean@...rly.run, robh+dt@...nel.org,
        airlied@...ux.ie, daniel@...ll.ch, jcrouse@...eaurora.org,
        dianders@...omium.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: drm/msm/gpu: document second
 interconnect

On Thu 21 Nov 17:26 PST 2019, Brian Masney wrote:

> Some A3xx and all A4xx Adreno GPUs do not have GMEM inside the GPU core
> and must use the On Chip MEMory (OCMEM) in order to be functional.
> There's a separate interconnect path that needs to be setup to OCMEM.
> Let's document this second interconnect path that's available. Since
> there's now two available interconnects, let's add the
> interconnect-names property.
> 
> Signed-off-by: Brian Masney <masneyb@...tation.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  Documentation/devicetree/bindings/display/msm/gpu.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt b/Documentation/devicetree/bindings/display/msm/gpu.txt
> index 2b8fd26c43b0..3e6cd3f64a78 100644
> --- a/Documentation/devicetree/bindings/display/msm/gpu.txt
> +++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
> @@ -23,7 +23,10 @@ Required properties:
>  - iommus: optional phandle to an adreno iommu instance
>  - operating-points-v2: optional phandle to the OPP operating points
>  - interconnects: optional phandle to an interconnect provider.  See
> -  ../interconnect/interconnect.txt for details.
> +  ../interconnect/interconnect.txt for details. Some A3xx and all A4xx platforms
> +  will have two paths; all others will have one path.
> +- interconnect-names: The names of the interconnect paths that correspond to the
> +  interconnects property. Values must be gfx-mem and ocmem.
>  - qcom,gmu: For GMU attached devices a phandle to the GMU device that will
>    control the power for the GPU. Applicable targets:
>      - qcom,adreno-630.2
> @@ -76,6 +79,7 @@ Example a6xx (with GMU):
>  		operating-points-v2 = <&gpu_opp_table>;
>  
>  		interconnects = <&rsc_hlos MASTER_GFX3D &rsc_hlos SLAVE_EBI1>;
> +		interconnect-names = "gfx-mem";
>  
>  		qcom,gmu = <&gmu>;
>  
> -- 
> 2.21.0
>