Subject: Re: [PATCH v2 08/11] dt-bindings: arm: samsung: Convert Exynos System Registers bindings to json-schema

From: Rob Herring <[email-masked]>
Date: Wed, 18 Sep 2019 07:36:54 -0500

On Sat, Sep 07, 2019 at 11:20:04AM +0200, Krzysztof Kozlowski wrote:
> Convert Samsung Exynos System Registers (SYSREG) bindings to DT schema
> format using json-schema.
> 
> Signed-off-by: Krzysztof Kozlowski <[email-masked]>
> 
> ---
> 
> Example somehow fails:
> Documentation/devicetree/bindings/arm/samsung/pmu.example.dt.yaml:
> system-controller@10040000: compatible:0: 'samsung,exynos5250-pmu' is
> not one of ['samsung,exynos4-sysreg', 'samsung,exynos5-sysreg']
> 
> It seems that PMU schema is applied to sysreq nodes (and vice-versa).
> ---
>  .../bindings/arm/samsung/sysreg.txt           | 19 -----------
>  .../bindings/arm/samsung/sysreg.yaml          | 33 +++++++++++++++++++
>  2 files changed, 33 insertions(+), 19 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/arm/samsung/sysreg.txt
>  create mode 100644 Documentation/devicetree/bindings/arm/samsung/sysreg.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt b/Documentation/devicetree/bindings/arm/samsung/sysreg.txt
> deleted file mode 100644
> index 4fced6e9d5e4..000000000000
> --- a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt
> +++ /dev/null
> @@ -1,19 +0,0 @@
> -SAMSUNG S5P/Exynos SoC series System Registers (SYSREG)
> -
> -Properties:
> - - compatible : should contain two values. First value must be one from following list:
> -		- "samsung,exynos4-sysreg" - for Exynos4 based SoCs,
> -		- "samsung,exynos5-sysreg" - for Exynos5 based SoCs.
> -		second value must be always "syscon".
> - - reg : offset and length of the register set.
> -
> -Example:
> -	syscon@10010000 {
> -		compatible = "samsung,exynos4-sysreg", "syscon";
> -		reg = <0x10010000 0x400>;
> -	};
> -
> -	syscon@10050000 {
> -		compatible = "samsung,exynos5-sysreg", "syscon";
> -		reg = <0x10050000 0x5000>;
> -	};
> diff --git a/Documentation/devicetree/bindings/arm/samsung/sysreg.yaml b/Documentation/devicetree/bindings/arm/samsung/sysreg.yaml
> new file mode 100644
> index 000000000000..a3d44646e441
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/samsung/sysreg.yaml
> @@ -0,0 +1,33 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/samsung/sysreg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung S5P/Exynos SoC series System Registers (SYSREG)
> +
> +maintainers:
> +  - Krzysztof Kozlowski <[email-masked]>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - samsung,exynos4-sysreg
> +          - samsung,exynos5-sysreg
> +      - const: syscon

The problem is this will by default match any node with 'syscon'. You 
have to add a custom 'select' entry. See the LVDS panel bindings for an 
example.

I'd like to kill off 'syscon'...

> +
> +  reg:
> +    maxItems: 1
> +
> +examples:
> +  - |
> +    syscon@10010000 {
> +      compatible = "samsung,exynos4-sysreg", "syscon";
> +      reg = <0x10010000 0x400>;
> +    };
> +
> +    syscon@10050000 {
> +      compatible = "samsung,exynos5-sysreg", "syscon";
> +      reg = <0x10050000 0x5000>;
> +    };
> -- 
> 2.17.1
> 

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