linux-kernel - Re: [PATCH v2] drm/mipi-dsi: Add OF notifier handler

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Date: Fri, 28 Jun 2024 12:31:40 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Rob Herring
 <robh@...nel.org>
Subject: Re: [PATCH v2] drm/mipi-dsi: Add OF notifier handler

Hello Chen-Yu,

+Rob

On Thu, 27 Jun 2024 15:19:03 +0800
Chen-Yu Tsai <wenst@...omium.org> wrote:

> Add OF notifier handler needed for creating/destroying MIPI DSI devices
> according to dynamic runtime changes in the DT live tree. This code is
> enabled when CONFIG_OF_DYNAMIC is selected.
> 
> This is based on existing code for I2C and SPI subsystems.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>

Thanks for copying me on this patch. Could be useful for my
hotplug-bridge work, however I'm aiming at writing code that works also
for non-DSI so we'll see. The code looks pretty fine however.

My concern however is about the usage of an OF reconfig notifier. A few
days ago Rob Herring wrote:

> a notifier is never a great design so
> maybe we can come up with something better

(https://lore.kernel.org/all/CAL_Jsq+=mGEJXsjq1UZFMJtHko_z+doiFMXnx9K7exDuznymSA@mail.gmail.com)

So maybe this is something you can clarify with him.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com