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Message-ID: <20251215161706.2ea3wtu3xlwcxxar@pengutronix.de>
Date: Mon, 15 Dec 2025 17:17:06 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Liu Ying <victor.liu@....com>, krzk+dt@...nel.org
Cc: Rob Herring <robh@...nel.org>, 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>, Peng Fan <peng.fan@....com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
devicetree@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v7 1/3] dt-bindings: soc: imx93-media-blk-ctrl: Add PDFC
subnode to schema and example
Hi Liu,
On 25-12-08, Liu Ying wrote:
> Hi Marco,
>
> On 12/02/2025, Marco Felsch wrote:
> > From: Liu Ying <victor.liu@....com>
> >
> > i.MX93 SoC mediamix blk-ctrl contains one DISPLAY_MUX register which
> > configures parallel display format by using the "PARALLEL_DISP_FORMAT"
> > field. Document the Parallel Display Format Configuration(PDFC) subnode
> > and add the subnode to example.
> >
> > Signed-off-by: Liu Ying <victor.liu@....com>
> > [m.felsch@...gutronix.de: port to v6.18-rc1]
> > [m.felsch@...gutronix.de: add bus-width]
> > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > ---
> > .../bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml | 92 ++++++++++++++++++++++
> > 1 file changed, 92 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 34aea58094e55365a2f9c86092f637e533f954ff..6e2d86d9341c75108b492bcbabc8a560d8e707cd 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
> > @@ -26,6 +26,12 @@ properties:
> > reg:
> > maxItems: 1
> >
> > + '#address-cells':
> > + const: 1
> > +
> > + '#size-cells':
> > + const: 1
> > +
> > '#power-domain-cells':
> > const: 1
> >
> > @@ -40,6 +46,60 @@ properties:
> > minItems: 8
> > maxItems: 10
> >
> > + bridge@60:
>
> The dependency patch series mentioned in cover letter has two links in it's
> cover letter. Reading the patch sets pointed by the two links, we may find
> Krzysztof's comments - the child nodes of the blk-ctrl should be completely
> documented.
Thanks for pointing this out.
@Krzysztof
Requesting to add everything seems not feasible if everything added
should be tested too.
I don't see why everything should be added in one step, since the base
.dtsi isn't added in one step too.
The different devices (parallel-out bridge, DSI bridge, LVDS bridge,
CSI) logically don't belong together, ableit all device use the same
syscon as parent.
Regards,
Marco
> > + type: object
> > + additionalProperties: false
> > +
> > + properties:
> > + compatible:
> > + const: nxp,imx93-pdfc
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + ports:
> > + $ref: /schemas/graph.yaml#/properties/ports
> > +
> > + properties:
> > + port@0:
> > + $ref: /schemas/graph.yaml#/properties/port
> > + description: Input port node to receive pixel data.
> > +
> > + port@1:
> > + $ref: /schemas/graph.yaml#/$defs/port-base
> > + unevaluatedProperties: false
> > + description: Output port node to downstream pixel data receivers.
> > +
> > + properties:
> > + endpoint:
> > + $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > + unevaluatedProperties: false
> > +
> > + properties:
> > + bus-width:
>
> In v1-v5, I thought the output bus format can be determined by the sink
> device(a panel or a bridge) hence properties like bus-width were not needed.
> But, if this property is really needed, then reference video-interfaces.yaml
> since bus-width is documented there. Should we reference bus-type defined
> in video-interfaces.yaml too?
>
> > + enum: [ 16, 18, 24 ]
>
> The PARALLEL_DISP_FORMAT field of DISPLAY_MUX register says this IP supports
> below formats. It seems that the enum here may tell RGB888, RGB666 and RGB565.
> How can we tell RGB555, YCbCr 24 bits and YUV444 then?
>
> 000b RGB888 -> RGB888
> 001b RGB888 -> RGB666
> 010b RGB565 -> RGB565
> 011b RGB555 -> RGB555
> 100b YUV -> YCbCr 24 bits
> 101b YUV -> YUV444
>
> > + description:
> > + Specify the physical parallel bus width.
> > +
> > + This property is optional if the display bus-width
> > + matches the SoC bus-width, e.g. a 18-bit RGB666 (display)
> > + is connected and all 18-bit data lanes are muxed to the
>
> Per video-interfaces.yaml, s/data lanes/data lines/. "data lanes" is a
> value for MIPI DSI/CSI, afaik.
>
> > + parallel-output pads.
>
> How about just saying that this property is optional and by default it's 24?
>
> > +
> > + This property must be set to 18 to cut only the LSBs
> > + instead of the MSBs in case a 24-bit RGB888 display is
> > + connected and only the lower 18-bit data lanes are muxed
> > + to the parallel-output pads.
>
> The __lower__ 18-bit? Isn't it the __MSB__ 6bit in each color component?
>
> > +
> > + required:
> > + - port@0
> > + - port@1
> > +
> > + required:
> > + - compatible
> > + - reg
> > + - ports
> > +
> > allOf:
> > - if:
> > properties:
> > @@ -81,9 +141,12 @@ allOf:
> > - const: isi
> > - const: csi
> > - const: dsi
> > +
> > required:
> > - compatible
> > - reg
> > + - '#address-cells'
> > + - '#size-cells'
> > - power-domains
> > - clocks
> > - clock-names
> > @@ -112,4 +175,33 @@ examples:
> > clock-names = "apb", "axi", "nic", "disp", "cam",
> > "pxp", "lcdif", "isi", "csi", "dsi";
> > #power-domain-cells = <1>;
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > +
> > + bridge@60 {
> > + compatible = "nxp,imx93-pdfc";
> > + reg = <0x60 0x4>;
> > +
> > + ports {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > +
> > + pdfc_from_lcdif: endpoint {
> > + remote-endpoint = <&lcdif_to_pdfc>;
> > + };
> > + };
> > +
> > + port@1 {
> > + reg = <1>;
> > +
> > + pdfc_to_panel: endpoint {
> > + remote-endpoint = <&panel_from_pdfc>;
> > + bus-width = <18>;
> > + };
> > + };
> > + };
> > + };
> > };
> >
>
>
> --
> Regards,
> Liu Ying
>
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