[PATCH] dt-bindings: dma: fsl-mxs-dma: Convert MXS DMA to DT schema

[Krzysztof Kozlowski]

On 18/12/2022 00:12, Marek Vasut wrote:
> On 12/17/22 12:05, Krzysztof Kozlowski wrote:
> 
> [...]
> 
>>> +allOf:
>>> +  - $ref: dma-controller.yaml#
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          not:
>>
>> I think "not:" goes just after "if:". Please double check that it's correct.
>>
>> Anyway it is easier to have this without negation and you already
>> enumerate all variants (here and below).
> 
> About this part, I don't think that works. See this:
> 
> $ git grep -A 15 'imx2[38]-dma-apb[hx]' arch/ | grep 
> '\(imx2[38]-dma-apb[hx]\|dma-channels\)'
> arch/arm/boot/dts/imx23.dtsi: compatible = "fsl,imx23-dma-apbh";
> arch/arm/boot/dts/imx23.dtsi- dma-channels = <8>;
> arch/arm/boot/dts/imx23.dtsi: compatible = "fsl,imx23-dma-apbx";
> arch/arm/boot/dts/imx23.dtsi- dma-channels = <16>;
> arch/arm/boot/dts/imx28.dtsi: compatible = "fsl,imx28-dma-apbh";
> arch/arm/boot/dts/imx28.dtsi- dma-channels = <16>;
> arch/arm/boot/dts/imx28.dtsi: compatible = "fsl,imx28-dma-apbx";
> arch/arm/boot/dts/imx28.dtsi- dma-channels = <16>;
> arch/arm/boot/dts/imx6qdl.dtsi: compatible = "fsl,imx6q-dma-apbh", 
> "fsl,imx28-dma-apbh";
> arch/arm/boot/dts/imx6qdl.dtsi- dma-channels = <4>;
> arch/arm/boot/dts/imx6sx.dtsi: compatible = "fsl,imx6sx-dma-apbh", 
> "fsl,imx28-dma-apbh";
> arch/arm/boot/dts/imx6sx.dtsi- dma-channels = <4>;
> arch/arm/boot/dts/imx6ul.dtsi: compatible = "fsl,imx6q-dma-apbh", 
> "fsl,imx28-dma-apbh";
> arch/arm/boot/dts/imx6ul.dtsi- dma-channels = <4>;
> arch/arm/boot/dts/imx7s.dtsi: compatible = "fsl,imx7d-dma-apbh", 
> "fsl,imx28-dma-apbh";
> arch/arm/boot/dts/imx7s.dtsi- dma-channels = <4>;
> arch/arm64/boot/dts/freescale/imx8mm.dtsi: compatible = 
> "fsl,imx7d-dma-apbh", "fsl,imx28-dma-apbh";
> arch/arm64/boot/dts/freescale/imx8mm.dtsi- dma-channels = <4>;
> arch/arm64/boot/dts/freescale/imx8mn.dtsi: compatible = 
> "fsl,imx7d-dma-apbh", "fsl,imx28-dma-apbh";
> arch/arm64/boot/dts/freescale/imx8mn.dtsi- dma-channels = <4>;
> 
> So I think what we have to do to validate that, is, say
> 
> default: 4
> 
> if does not match on 6q/6sx/7d/23-apbx/28-abbh/28-apbx then 8
> 
> if does not match on 6q/6sx/7d/23-apbh then 16
> 
> But if there is a better way to validate the above, please do tell.

Then your existing if:then: is also not correct because you require for
fsl,imx28-dma-apbh (as it is not in second if:then:) const:16. Just
don't require it.

Best regards,
Krzysztof