linux-kernel - Re: [PATCH RFC v4 05/15] spi: dt-bindings: add PWM SPI offload trigger

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Message-ID: <20241031-croon-boss-3b30ff9e9333@spud>
Date: Thu, 31 Oct 2024 18:16:10 +0000
From: Conor Dooley <conor@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>
Cc: David Lechner <dlechner@...libre.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nuno Sá <nuno.sa@...log.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	David Jander <david@...tonic.nl>,
	Martin Sperl <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH RFC v4 05/15] spi: dt-bindings: add PWM SPI offload
 trigger

On Sat, Oct 26, 2024 at 04:18:37PM +0100, Jonathan Cameron wrote:
> On Wed, 23 Oct 2024 15:59:12 -0500
> David Lechner <dlechner@...libre.com> wrote:
> 
> > Add a new binding for using a PWM signal as a trigger for SPI offloads.
> 
> I don't have a better suggestion for this, but it does smell rather like
> other bridge binding (iio-hwmon for example) where we have had push back on
> representing something that doesn't really exist but is just a way to
> tie two bits of hardware together. Those kind of exist because we snuck
> them in a long time back when no one was paying attention.

I dunno. iio-hwmon to me is a particularly strange one, because it is
the exact same device being used in different subsystems. Like that
voltage monitoring device with 10000 compatibles that I CCed you and
Peter on the other day feels like it should really in your subsytem. A
"hwmon" isn't a class of device at all.

This however, I think is more like pwm-clock (or clk-pwm, they both
exist and are opposites) where the node is used to change the type of
device rather than the subsystem using it.

> So this one may need more explanation and justification and I'd definitely
> like some DT maintainer review on this at a fairly early stage!

Ye, /shrug. Maybe the others have dissenting opinions. I'd like to hear
from them, but I don't personally have a problem with this.

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