Re: [Patch v6] dt-bindings: media: s5p-mfc: convert bindings to json-schema

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 01/03/2023 04:51, Aakarsh Jain wrote:
> Convert s5p-mfc bindings to DT schema format using json-schema.
> 
> Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> ---
> changes since v5:
> kept compatible strings under enum
> sorted compatible strings
> added iommu maxItems:2
> Added indentation with 4 spaces in dts example
> 
> changes since v4:
> Removed items from oneOf section
> dropped black line
> defined the iommus names items as
> items:
> -const left
> -const right
> 
> changes since v3:
> fixed dt-schema warnings and errors while running make dtbs_check and make dt_binding_check for ARMv7
> Since, obsolete properties are not part of dt-node so we are not including these properties in dt-schema.
> 
> changes since v2:
> changed Commit message from Adds to Convert
> Removed text "This file has moved to samsung,s5p-mfc.yaml" from s5p-mfc.txt
> fixed dt-schema warnings and errors while running make dtbs_check and make dt_binding_check
> 
> changes since v1:
> fixed dt-schema warnings and errors while running make dtbs_check and make dt_binding_check
> Removed description.
> Listed items.
> Added allOf:if:then for restricting two items to specific compatible
> 
> This patch is independent from the previous MFC v12 patch series for HW3 support.
> 
>  .../devicetree/bindings/media/s5p-mfc.txt     |  78 ---------
>  .../bindings/media/samsung,s5p-mfc.yaml       | 151 ++++++++++++++++++
>  2 files changed, 151 insertions(+), 78 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/s5p-mfc.txt b/Documentation/devicetree/bindings/media/s5p-mfc.txt
> index 8eb90c043d5d..e69de29bb2d1 100644
> --- a/Documentation/devicetree/bindings/media/s5p-mfc.txt
> +++ b/Documentation/devicetree/bindings/media/s5p-mfc.txt
> @@ -1,78 +0,0 @@
> -* Samsung Multi Format Codec (MFC)
> -
> -Multi Format Codec (MFC) is the IP present in Samsung SoCs which
> -supports high resolution decoding and encoding functionalities.
> -The MFC device driver is a v4l2 driver which can encode/decode
> -video raw/elementary streams and has support for all popular
> -video codecs.
> -
> -Required properties:
> -  - compatible : value should be either one among the following
> -	(a) "samsung,mfc-v5" for MFC v5 present in Exynos4 SoCs
> -	(b) "samsung,mfc-v6" for MFC v6 present in Exynos5 SoCs
> -	(c) "samsung,exynos3250-mfc", "samsung,mfc-v7" for MFC v7
> -	     present in Exynos3250 SoC
> -	(d) "samsung,mfc-v7" for MFC v7 present in Exynos5420 SoC
> -	(e) "samsung,mfc-v8" for MFC v8 present in Exynos5800 SoC
> -	(f) "samsung,exynos5433-mfc" for MFC v8 present in Exynos5433 SoC
> -	(g) "samsung,mfc-v10" for MFC v10 present in Exynos7880 SoC
> -
> -  - reg : Physical base address of the IP registers and length of memory
> -	  mapped region.
> -
> -  - interrupts : MFC interrupt number to the CPU.
> -  - clocks : from common clock binding: handle to mfc clock.
> -  - clock-names : from common clock binding: must contain "mfc",
> -		  corresponding to entry in the clocks property.
> -
> -Optional properties:
> -  - power-domains : power-domain property defined with a phandle
> -			   to respective power domain.
> -  - memory-region : from reserved memory binding: phandles to two reserved
> -	memory regions, first is for "left" mfc memory bus interfaces,
> -	second if for the "right" mfc memory bus, used when no SYSMMU
> -	support is available; used only by MFC v5 present in Exynos4 SoCs
> -
> -Obsolete properties:
> -  - samsung,mfc-r, samsung,mfc-l : support removed, please use memory-region
> -	property instead
> -
> -
> -Example:
> -SoC specific DT entry:
> -
> -mfc: codec@13400000 {
> -	compatible = "samsung,mfc-v5";
> -	reg = <0x13400000 0x10000>;
> -	interrupts = <0 94 0>;
> -	power-domains = <&pd_mfc>;
> -	clocks = <&clock 273>;
> -	clock-names = "mfc";
> -};
> -
> -Reserved memory specific DT entry for given board (see reserved memory binding
> -for more information):
> -
> -reserved-memory {
> -	#address-cells = <1>;
> -	#size-cells = <1>;
> -	ranges;
> -
> -	mfc_left: region@51000000 {
> -		compatible = "shared-dma-pool";
> -		no-map;
> -		reg = <0x51000000 0x800000>;
> -	};
> -
> -	mfc_right: region@43000000 {
> -		compatible = "shared-dma-pool";
> -		no-map;
> -		reg = <0x43000000 0x800000>;
> -	};
> -};
> -
> -Board specific DT entry:
> -
> -codec@13400000 {
> -	memory-region = <&mfc_left>, <&mfc_right>;
> -};
> diff --git a/Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml b/Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml
> index 000000000000..da48d0493cdd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/samsung,s5p-mfc.yaml
> @@ -0,0 +1,151 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/samsung,s5p-mfc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung Exynos Multi Format Codec (MFC)
> +
> +maintainers:
> +  - Marek Szyprowski <m.szyprowski@samsung.com>
> +  - Aakarsh Jain <aakarsh.jain@samsung.com>
> +
> +description:
> +  Multi Format Codec (MFC) is the IP present in Samsung SoCs which
> +  supports high resolution decoding and encoding functionalities.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - samsung,exynos5433-mfc        # Exynos5433
> +          - samsung,mfc-v5                # Exynos4
> +          - samsung,mfc-v6                # Exynos5
> +          - samsung,mfc-v7                # Exynos5420
> +          - samsung,mfc-v8                # Exynos5800
> +          - samsung,mfc-v10               # Exynos7880
> +      - items:
> +          - enum:
> +              - samsung,exynos3250-mfc    # Exynos3250
> +          - const: samsung,mfc-v7         # Fall back for Exynos3250
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 3
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 3
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  iommus:
> +    minItems: 1
> +    maxItems: 2
> +
> +  iommu-names:
> +    items:
> +      - const: left
> +      - const: right

That's confusing now... The iommu-names above says it requires two
iommus, but your iommus property says one item is enough. You need here
minItems: 1... but then why one IOMMU (for such variants) is always
"left"? Probably then the meaning of first IOMMU changes, right? If
that's correct, then I propose to leave it as minItems:1/maxItems:2
without defining the items here and...

> +
> +  power-domains:
> +    maxItems: 1
> +
> +  memory-region:
> +    minItems: 1
> +    maxItems: 2
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +
> +additionalProperties: false
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - samsung,mfc-v5
> +              - samsung,exynos3250-mfc
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 2
> +        clock-names:
> +          items:
> +            - const: mfc
> +            - const: sclk_mfc

iommus:
  maxItems: 1
iommu-names: false

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - samsung,mfc-v6
> +              - samsung,mfc-v8
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +        clock-names:
> +          items:
> +            - const: mfc
> +        iommus:
> +          maxItems: 2

... and here:
iommu-names:
  items:
    - const: left
    - const: right

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - samsung,exynos5433-mfc
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 3
> +        clock-names:
> +          items:
> +            - const: pclk
> +            - const: aclk
> +            - const: aclk_xiu
> +        iommus:
> +          maxItems: 2

the same here

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - samsung,mfc-v7
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 1
> +          maxItems: 2

iommus:
  maxItems: 1
iommu-names: false


Best regards,
Krzysztof