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: <2215802.irdbgypaU6@steina-w>
Date: Tue, 25 Feb 2025 16:08:20 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Rob Herring <robh@...nel.org>
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

Am Dienstag, 25. Februar 2025, 15:52:54 CET schrieb Rob Herring:
> ********************
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> ********************
> 
> 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.

Thanks for pointing out. Because system-controller@...10000 is not
a simple-bus I assume this needs explicit ranges, as you pointed out in
your comment on Patch 4, no?

Best regards,
Alexander

> > +
> > +      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>;
> > +                  };
> > +              };
> > +          };
> > +        };
> >      };
> 


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