linux-kernel - Re: [PATCH v7 1/3] dt-bindings: soc: imx93-media-blk-ctrl: Add PDFC subnode to schema and example

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <033450ab-f14d-4bf7-b7ee-aaffd014820d@lunn.ch>
Date: Fri, 19 Dec 2025 16:49:27 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, Liu Ying <victor.liu@....com>,
	krzk+dt@...nel.org, Rob Herring <robh@...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

> We discussed the ranges/reg usage internally as well with the following
> outcome:
> 
> - Situation
> 
>   With i.MX8M SoCs NXP introduced MIX domains. Each domain has a so
>   called BLK-CTRL IP. There is no common register layout for the
>   BLK-CTRL IPs. In addition to this, the register fields within one
>   register may not related to the same IP. Please see my below example:
>   
>   The DISP_MUX register configures the DPI output routed to physical
>   SoC pads as well as the internal MIPI-DSI DPI behavior. This PDFC
>   bridge binding is only interested in the first part, not the 2nd.
> 
>   In other words, the BLK-CTRL IP can be seen as a bunch of loose
>   register fields.

Why do hardware engineers keep on insisting on doing this. And why
don't software engineers when asked to review the proposed registers
push back and say No?

I know this is out of you hands, but it is something we should
encourage software engineers at SoC vendors to do. Otherwise we will
have to continually live with such a mess.

     Andrew