linux-kernel - Re: [PATCH v10 4/6] pwm: Make it possible to apply PWM changes in atomic context

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Message-ID: <eluxhmgxx7iwaou3t3hlqa6zvy4wpfdzcunke3kuaqtho7vjnc@cpqbb6cdsewu>
Date: Wed, 20 Dec 2023 11:31:53 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Sean Young <sean@...s.org>
Cc: linux-media@...r.kernel.org, linux-pwm@...r.kernel.org, 
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 4/6] pwm: Make it possible to apply PWM changes in
 atomic context

On Tue, Dec 19, 2023 at 04:30:27PM +0000, Sean Young wrote:
> Some PWM devices require sleeping, for example if the pwm device is
> connected over I2C. However, many PWM devices could be used from atomic
> context, e.g. memory mapped PWM. This is useful for, for example, the
> pwm-ir-tx driver which requires precise timing. Sleeping causes havoc
> with the generated IR signal.
> 
> Since not all PWM devices can support atomic context, we also add a
> pwm_might_sleep() function to check if is not supported.
> 
> Signed-off-by: Sean Young <sean@...s.org>

Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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