linux-kernel - [PATCH v2 02/18] dt-bindings: msm: dsi-controller-main: Fix power-domain constraint

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Date:   Mon,  7 Nov 2022 23:56:38 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     robdclark@...il.com, quic_abhinavk@...cinc.com,
        dmitry.baryshkov@...aro.org, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, quic_mkrishn@...cinc.com,
        linux-arm-msm@...r.kernel.org
Cc:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/18] dt-bindings: msm: dsi-controller-main: Fix power-domain constraint

power-domain is required for the sc7180 dispcc GDSC but not every qcom SoC
has a similar dependency for example the aqp8064.

Most Qcom SoC's using mdss-dsi-ctrl seem to have the ability to
power-collapse the MDP without collapsing DSI.

For example the qcom vendor kernel commit for apq8084, msm8226, msm8916, msm8974

https://review.carbonrom.org/plugins/gitiles/CarbonROM/android_kernel_oneplus_msm8994/+/7b5c011a770daa2811778937ed646237a28a8694

"ARM: dts: msm: add mdss gdsc supply to dsi controller device

 It is possible for the DSI controller to be active when MDP is
 power collapsed. DSI controller needs to have it's own vote for
 mdss gdsc to ensure that gdsc remains on in such cases."

This however doesn't appear to be the case for the apq8064 so we shouldn't
be marking power-domain as required in yaml checks.

Fixes: 4dbe55c97741 ("dt-bindings: msm: dsi: add yaml schemas for DSI bindings")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Rob Clark <robdclark@...il.com>
Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Sean Paul <sean@...rly.run>
Cc: David Airlie <airlied@...il.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: linux-arm-msm@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 .../devicetree/bindings/display/msm/dsi-controller-main.yaml     | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
index 27ebfd5ffb22f..cf782c5f5bdb0 100644
--- a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
+++ b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
@@ -134,7 +134,6 @@ required:
   - phys
   - assigned-clocks
   - assigned-clock-parents
-  - power-domains
   - ports
 
 additionalProperties: false
-- 
2.38.1