Messages in this thread | | | Date | Thu, 14 May 2020 09:27:56 +0100 | From | Russell King - ARM Linux admin <> | Subject | Re: [PATCH 2/3] drm/etnaviv: Don't ignore errors on getting clocks |
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On Thu, May 14, 2020 at 10:18:02AM +0200, Lucas Stach wrote: > Am Mittwoch, den 13.05.2020, 23:41 -0300 schrieb Fabio Estevam: > > On Wed, May 13, 2020 at 2:09 PM Fabio Estevam <festevam@gmail.com> wrote: > > > > > The binding doc Documentation/devicetree/bindings/gpu/vivante,gc.yaml > > > says that only the 'reg' clock could be optional, the others are > > > required. > > > > arch/arm/boot/dts/dove.dtsi only uses the 'core' clock. > > arch/arm/boot/dts/stm32mp157.dtsi uses 'bus' and 'core' > > > > Maybe the binding needs to be updated and it seems that using > > devm_clk_get_optional() like you propose is safe. > > The binding is correct as-is. We want to require those clocks to be > present, but the dove DT was added before the binding was finalized, so > the driver still treats the clocks as optional to not break > compatibility with old DTs. Maybe this warrants a comment in the > code...
The binding doc in mainline says:
clocks: items: - description: AXI/master interface clock - description: GPU core clock - description: Shader clock (only required if GPU has feature PIPE_3D) - description: AHB/slave interface clock (only required if GPU can gate slave interface independently) minItems: 1 maxItems: 4
clock-names: items: enum: [ bus, core, shader, reg ] minItems: 1 maxItems: 4
which looks correct to me - and means that Dove is compliant with that.
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