dt-bindings: display/msm: qcom,mdp5: drop lut clock

[PATCH] dt-bindings: display/msm: qcom,mdp5: drop lut clock

Posted by Dmitry Baryshkov 1 month, 3 weeks ago

None of MDP5 platforms have a LUT clock on the display-controller, it
was added by the mistake. Drop it, fixing DT warnings on MSM8976 /
MSM8956 platforms. Technically it's an ABI break, but no other platforms
are affected.

Fixes: 385c8ac763b3 ("dt-bindings: display/msm: convert MDP5 schema to YAML format")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
index e153f8d26e7aaec64656570bbec700794651c10f..2735c78b0b67af8c004350f40ca9700c563b75f8 100644
--- a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
+++ b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
@@ -60,7 +60,6 @@ properties:
           - const: bus
           - const: core
           - const: vsync
-          - const: lut
           - const: tbu
           - const: tbu_rt
         # MSM8996 has additional iommu clock

---
base-commit: a933d3dc1968fcfb0ab72879ec304b1971ed1b9a
change-id: 20250809-msm8976-no-lut-4b5100bcfb35

Best regards,
-- 
With best wishes
Dmitry

Re: [PATCH] dt-bindings: display/msm: qcom,mdp5: drop lut clock

Posted by Rob Herring (Arm) 1 month, 2 weeks ago

On Sat, 09 Aug 2025 11:36:54 +0300, Dmitry Baryshkov wrote:
> None of MDP5 platforms have a LUT clock on the display-controller, it
> was added by the mistake. Drop it, fixing DT warnings on MSM8976 /
> MSM8956 platforms. Technically it's an ABI break, but no other platforms
> are affected.
> 
> Fixes: 385c8ac763b3 ("dt-bindings: display/msm: convert MDP5 schema to YAML format")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml | 1 -
>  1 file changed, 1 deletion(-)
> 

Acked-by: Rob Herring (Arm) <robh@kernel.org>

Re: [PATCH] dt-bindings: display/msm: qcom,mdp5: drop lut clock

Posted by Konrad Dybcio 1 month, 3 weeks ago

On 8/9/25 10:36 AM, Dmitry Baryshkov wrote:
> None of MDP5 platforms have a LUT clock on the display-controller, it

8974 and friends seem to bind it to the GDSC

although on msm-3.4:

arch/arm/mach-msm/clock-8974.c
4197:static struct branch_clk mdss_mdp_lut_clk = {
4203:           .dbg_name = "mdss_mdp_lut_clk",
4205:           CLK_INIT(mdss_mdp_lut_clk.c),
4609:   {&mdss_mdp_lut_clk.c,                   MMSS_BASE, 0x0015},
5118:   CLK_LOOKUP("lut_clk", mdss_mdp_lut_clk.c, "mdp.0"),
5387:   CLK_LOOKUP("lut_clk", mdss_mdp_lut_clk.c, "fd8c2304.qcom,gdsc"

Konrad

> was added by the mistake. Drop it, fixing DT warnings on MSM8976 /
> MSM8956 platforms. Technically it's an ABI break, but no other platforms
> are affected.
> 
> Fixes: 385c8ac763b3 ("dt-bindings: display/msm: convert MDP5 schema to YAML format")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> index e153f8d26e7aaec64656570bbec700794651c10f..2735c78b0b67af8c004350f40ca9700c563b75f8 100644
> --- a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> @@ -60,7 +60,6 @@ properties:
>            - const: bus
>            - const: core
>            - const: vsync
> -          - const: lut
>            - const: tbu
>            - const: tbu_rt
>          # MSM8996 has additional iommu clock
> 
> ---
> base-commit: a933d3dc1968fcfb0ab72879ec304b1971ed1b9a
> change-id: 20250809-msm8976-no-lut-4b5100bcfb35
> 
> Best regards,

Re: [PATCH] dt-bindings: display/msm: qcom,mdp5: drop lut clock

Posted by Dmitry Baryshkov 1 month, 3 weeks ago

On Tue, Aug 12, 2025 at 12:27:14PM +0200, Konrad Dybcio wrote:
> On 8/9/25 10:36 AM, Dmitry Baryshkov wrote:
> > None of MDP5 platforms have a LUT clock on the display-controller, it
> 
> 8974 and friends seem to bind it to the GDSC
> 
> although on msm-3.4:
> 
> arch/arm/mach-msm/clock-8974.c
> 4197:static struct branch_clk mdss_mdp_lut_clk = {
> 4203:           .dbg_name = "mdss_mdp_lut_clk",
> 4205:           CLK_INIT(mdss_mdp_lut_clk.c),
> 4609:   {&mdss_mdp_lut_clk.c,                   MMSS_BASE, 0x0015},
> 5118:   CLK_LOOKUP("lut_clk", mdss_mdp_lut_clk.c, "mdp.0"),
> 5387:   CLK_LOOKUP("lut_clk", mdss_mdp_lut_clk.c, "fd8c2304.qcom,gdsc"

At least it's not used on upstream (nor could I find relevant docs in
the HPG).

> 
> Konrad
> 
> > was added by the mistake. Drop it, fixing DT warnings on MSM8976 /
> > MSM8956 platforms. Technically it's an ABI break, but no other platforms
> > are affected.
> > 
> > Fixes: 385c8ac763b3 ("dt-bindings: display/msm: convert MDP5 schema to YAML format")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> > ---
> >  Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> > index e153f8d26e7aaec64656570bbec700794651c10f..2735c78b0b67af8c004350f40ca9700c563b75f8 100644
> > --- a/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> > +++ b/Documentation/devicetree/bindings/display/msm/qcom,mdp5.yaml
> > @@ -60,7 +60,6 @@ properties:
> >            - const: bus
> >            - const: core
> >            - const: vsync
> > -          - const: lut
> >            - const: tbu
> >            - const: tbu_rt
> >          # MSM8996 has additional iommu clock
> > 
> > ---
> > base-commit: a933d3dc1968fcfb0ab72879ec304b1971ed1b9a
> > change-id: 20250809-msm8976-no-lut-4b5100bcfb35
> > 
> > Best regards,

-- 
With best wishes
Dmitry