On 26/08/2022 11:54, Serge Semin wrote: > On Tue, Aug 23, 2022 at 11:12:28AM +0300, Krzysztof Kozlowski wrote: >> On 22/08/2022 22:19, Serge Semin wrote: >>> Baikal-T1 DDR controller is based on the DW uMCTL2 DDRC IP-core v2.51a >>> with up to DDR3 protocol capability and 32-bit data bus + 8-bit ECC. There >>> are individual IRQs for each ECC and DFI events.The dedicated scrubber >> > >> Missing space before "The". > > Ok. Thanks. > >> >>> clock source is absent since it's fully synchronous to the core clock. >> > >> You need allOf:if-then restricting this per variant. > > I really don't like the allOf-if-if-etc pattern because it gets to be > very bulky if all the vendor-specific and generic platform > peculiarities are placed in there. I am more keen of having a > generic DT-schema which would be then allOf-ed by the vendor-specific > device bindings. What do you think I'd provide such design in this > case too? Sure, it would work. > > But I'll need to move the compatible property definition to the > "select" property. Like this: > > Documentation/devicetree/bindings/memory-controllers/snps,dw-umctl2-ddrc.yaml: > +[...] > +# Please create a separate DT-schema for your DW uMCTL2 DDR controller > +# and make sure it's assigned with the vendor-specific compatible string. > +select: > + properties: > + compatible: > + oneOf: > + - deprecated: true > + description: Synopsys DW uMCTL2 DDR controller v3.80a > + const: snps,ddrc-3.80a > + - description: Synopsys DW uMCTL2 DDR controller > + const: snps,dw-umctl2-ddrc > + - description: Xilinx ZynqMP DDR controller v2.40a > + const: xlnx,zynqmp-ddrc-2.40a > + required: > + - compatible Not entirely. If you need select, then add it with compatibles, but all descriptions and deprecated are staying in properties. > + > +properties: > + compatible: true > +[...] > +required: > + - compatible > + - reg > + - interrupts > + > +additionalProperties: true > > After that the "snps,dw-umctl2-ddrc.yaml" schema can be referenced in the > allOf composition. Like this: > > Documentation/devicetree/bindings/memory-controllers/baikal,bt1-ddrc.yaml: > +[...] > +allOf: > + - $ref: /schemas/memory-controllers/snps,dw-umctl2-ddrc.yaml# > +[...] > > At the same time the generic DT-schema will be used to evaluate the > "snps,ddrc-3.80a", "snps,dw-umctl2-ddrc" and "xlnx,zynqmp-ddrc-2.40a" > device nodes as before. What do you think about that? > > One big positive side of this that even though the generic schema > can't define the IRQ/resets/clocks phandlers order because various > platforms may have different external signals setup, the > vendor-specific schema can and should. So I'll be able to describe the > Baikal-T1 DDRC specific properties (clocks, clock-names, interrupts, > interrupt-names, etc) in much more details including the reference > signals order what you asked in the previous patch review. It's ok. You need then second schema for your device, because something must end with additional/unevaluatedProperties false. Best regards, Krzysztof
