linux-kernel - Re: [V5 04/10] dt-bindings: timestamp: Add nvidia,gpio-controller

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Date:   Wed, 12 Apr 2023 09:29:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dipen Patel <dipenp@...dia.com>
Cc:     thierry.reding@...il.com, jonathanh@...dia.com,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-gpio@...r.kernel.org, linus.walleij@...aro.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        timestamp@...ts.linux.dev, krzysztof.kozlowski+dt@...aro.org,
        brgl@...ev.pl, corbet@....net, gregkh@...uxfoundation.org
Subject: Re: [V5 04/10] dt-bindings: timestamp: Add nvidia,gpio-controller

On Thu, Apr 06, 2023 at 10:18:31AM -0700, Dipen Patel wrote:
> The tegra always-on (AON) GPIO HTE/GTE provider depends on the AON
> GPIO controller where it needs to do namespace conversion between GPIO
> line number (belonging to AON GPIO controller instance) and the GTE
> slice bits. The patch introduces nvidia,gpio-controller property to
> represent that dependency.
> 
> Signed-off-by: Dipen Patel <dipenp@...dia.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  .../timestamp/nvidia,tegra194-hte.yaml        | 36 ++++++++++++++++---
>  1 file changed, 31 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml b/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
> index 855dad3f2023..66eaa3fab8cc 100644
> --- a/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
> +++ b/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
> @@ -51,6 +51,12 @@ properties:
>        LIC instance has 11 slices and Tegra234 LIC has 17 slices.
>      enum: [3, 11, 17]
>  
> +  nvidia,gpio-controller:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      The phandle to AON gpio controller instance. This is required to handle
> +      namespace conversion between GPIO and GTE.
> +
>    '#timestamp-cells':
>      description:
>        This represents number of line id arguments as specified by the
> @@ -59,6 +65,12 @@ properties:
>        mentioned in the nvidia GPIO device tree binding document.
>      const: 1
>  
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#timestamp-cells"
> +
>  allOf:
>    - if:
>        properties:
> @@ -94,11 +106,15 @@ allOf:
>          nvidia,slices:
>            const: 17
>  
> -required:
> -  - compatible
> -  - reg
> -  - interrupts
> -  - "#timestamp-cells"
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - nvidia,tegra234-gte-aon
> +    then:
> +      required:
> +        - nvidia,gpio-controller

Adding a new required property is an ABI break. But you just added this 
in patch 2. If this is required as part of nvidia,tegra234-gte-aon 
support, then it should all be 1 patch.

>  
>  additionalProperties: false
>  
> @@ -112,6 +128,16 @@ examples:
>                #timestamp-cells = <1>;
>      };
>  
> +  - |
> +    tegra234_hte_aon: timestamp@...0000 {
> +              compatible = "nvidia,tegra234-gte-aon";
> +              reg = <0xc1e0000 0x10000>;
> +              interrupts = <0 13 0x4>;
> +              nvidia,int-threshold = <1>;
> +              nvidia,gpio-controller = <&gpio_aon>;
> +              #timestamp-cells = <1>;
> +    };
> +

Really need a whole other example for 1 property?

>    - |
>      tegra_hte_lic: timestamp@...0000 {
>                compatible = "nvidia,tegra194-gte-lic";
> -- 
> 2.17.1
>