linux-kernel - Re: [PATCH] dt-bindings: Drop undocumented i.MX iomuxc-gpr bindings in examples

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Date:   Mon, 25 Apr 2022 08:58:10 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Peter Rosin <peda@...ntia.se>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: Drop undocumented i.MX iomuxc-gpr bindings
 in examples

On Fri, 22 Apr 2022, Rob Herring wrote:

> The i.MX iomuxc-gpr bindings are undocumented and a mess. Drop their use
> from the examples.
> 
> The problem with the binding beyond the just random variations is that
> the iomuxc-gpr is not a separate block, but registers within the iomuxc
> block containing random leftover controls. As a separate DT node, it
> creates nodes with overlapping memory addresses.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  Documentation/devicetree/bindings/mfd/syscon.yaml  | 8 --------
>  Documentation/devicetree/bindings/mux/reg-mux.yaml | 1 -
>  2 files changed, 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/syscon.yaml b/Documentation/devicetree/bindings/mfd/syscon.yaml
> index 13baa452cc9d..fb784045013f 100644
> --- a/Documentation/devicetree/bindings/mfd/syscon.yaml
> +++ b/Documentation/devicetree/bindings/mfd/syscon.yaml
> @@ -100,12 +100,4 @@ examples:
>          compatible = "allwinner,sun8i-h3-system-controller", "syscon";
>          reg = <0x01c00000 0x1000>;
>      };
> -
> -  - |
> -    gpr: iomuxc-gpr@...0000 {
> -        compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
> -        reg = <0x020e0000 0x38>;
> -        hwlocks = <&hwlock1 1>;
> -    };
> -
>  ...
> diff --git a/Documentation/devicetree/bindings/mux/reg-mux.yaml b/Documentation/devicetree/bindings/mux/reg-mux.yaml
> index 60d5746eb39d..df4db96b5391 100644
> --- a/Documentation/devicetree/bindings/mux/reg-mux.yaml
> +++ b/Documentation/devicetree/bindings/mux/reg-mux.yaml
> @@ -96,7 +96,6 @@ examples:
>  
>      #include <dt-bindings/mux/mux.h>
>      syscon@...0 {
> -        compatible = "fsl,imx7d-iomuxc-gpr", "fsl,imx6q-iomuxc-gpr", "syscon", "simple-mfd";
>          reg = <0x1000 0x100>;

Is leaving no compatible the correct solution here?

Do we have another (working) platform that we can use in its place?

Does it make sense to leave the "syscon" and "simple-mfd" entries?

>          mux2: mux-controller {

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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