linux-kernel - Re: [PATCH v9 1/3] dt-bindings: soc: imx93-media-blk-ctrl: Add PDFC subnode to schema and example

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Message-ID: <20260121093953.2cfojrlflim7xfba@pengutronix.de>
Date: Wed, 21 Jan 2026 10:39:53 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
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>, Peng Fan <peng.fan@....com>,
	Liu Ying <victor.liu@....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>,
	luca.ceresoli@...tlin.com, 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 v9 1/3] dt-bindings: soc: imx93-media-blk-ctrl: Add PDFC
 subnode to schema and example

Hi Rob,

On 26-01-20, Rob Herring wrote:
> On Thu, Jan 15, 2026 at 04:24:51PM +0100, 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 | 78 ++++++++++++++++++++++
> >  1 file changed, 78 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..d828c2e82965c7a4cd69a67136047d83c96b0a35 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
> > @@ -40,6 +40,58 @@ properties:
> >      minItems: 8
> >      maxItems: 10
> >  
> > +  dpi-bridge:
> > +    type: object
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      compatible:
> > +        enum:
> > +          - nxp,imx91-pdfc
> > +          - nxp,imx93-pdfc
> 
> Looks like there's a register for this at 0x60. That should be a 'reg' 
> entry in the DT.

We discussed the usage of 'reg' here [1]. In short: This single
hw-register contains not only bits for the parallel output configuration
but also for the mipi-dsi configuration. So there should be no 'reg'
usage and instead let the syscon and driver do the correct handling.

Regards,
  Marco

[1] https://lore.kernel.org/all/PAXPR04MB84599D676EC1E3879694579688B2A@PAXPR04MB8459.eurprd04.prod.outlook.com/#t