linux-kernel - Re: [PATCH v2 2/6] dt-bindings: soc: imx93-media-blk-ctrl: Add LDB subnode into schema and example

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Message-ID: <20250225145254.GA2361434-robh@kernel.org>
Date: Tue, 25 Feb 2025 08:52:54 -0600
From: Rob Herring <robh@...nel.org>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Abel Vesa <abelvesa@...nel.org>,
	Peng Fan <peng.fan@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux@...tq-group.com,
	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: soc: imx93-media-blk-ctrl: Add LDB
 subnode into schema and example

On Mon, Feb 24, 2025 at 03:28:23PM +0100, Alexander Stein wrote:
> Document the LDB bridge subnode and add the subnode into the example.
> For the subnode to work, the block control must scan its subnodes and
> bind drivers to them, do not misuse either simple-bus or simple-mfd
> here.
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
>  .../soc/imx/fsl,imx93-media-blk-ctrl.yaml     | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> index b3554e7f9e76d..d914dea6ecbb5 100644
> --- a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> @@ -24,6 +24,14 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  ranges: true
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
>    '#power-domain-cells':
>      const: 1
>  
> @@ -46,9 +54,20 @@ properties:
>        - const: csi
>        - const: dsi
>  
> +  bridge@20:
> +    type: object
> +    additionalProperties: true
> +    properties:
> +      compatible:
> +        contains:
> +          const: fsl,imx93-ldb
> +
>  required:
>    - compatible
>    - reg
> +  - ranges
> +  - '#address-cells'
> +  - '#size-cells'
>    - power-domains
>    - clocks
>    - clock-names
> @@ -77,4 +96,36 @@ examples:
>                 clock-names = "apb", "axi", "nic", "disp", "cam",
>                               "pxp", "lcdif", "isi", "csi", "dsi";
>        #power-domain-cells = <1>;
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +      ranges;

Given the address below is 0x20, this looks wrong unless the parent 
address is 0.

> +
> +      bridge@20 {
> +          compatible = "fsl,imx93-ldb";
> +          reg = <0x20 0x4>, <0x24 0x4>;
> +          reg-names = "ldb", "lvds";
> +          clocks = <&clk IMX93_CLK_LVDS_GATE>;
> +          clock-names = "ldb";
> +
> +          ports {
> +              #address-cells = <1>;
> +              #size-cells = <0>;
> +
> +              port@0 {
> +                  reg = <0>;
> +
> +                  ldb_from_lcdif2: endpoint {
> +                      remote-endpoint = <&lcdif2_to_ldb>;
> +                  };
> +              };
> +
> +              port@1 {
> +                  reg = <1>;
> +
> +                  ldb_lvds: endpoint {
> +                      remote-endpoint = <&ldb_to_panel>;
> +                  };
> +              };
> +          };
> +        };
>      };
> -- 
> 2.43.0
>