linux-kernel - Re: [PATCH 1/2] regmap: add regmap_might

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Date:   Fri, 30 Apr 2021 16:19:09 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH 1/2] regmap: add regmap_might_sleep()

On Fri, Apr 30, 2021 at 03:06:44PM +0200, Michael Walle wrote:

> Sometimes a driver needs to know if the underlying regmap could sleep.
> For example, consider the gpio-regmap driver which needs to fill the
> gpiochip->can_sleep property.

Whatever is creating the regmap really ought to know what device it's
dealing with...

> It might be possible to pass this information via the
> gpio_regmap_config, but this has the following drawbacks. First, that
> property is redundant and both places might contratict each other. And
> secondly, the driver might not even know the type of the regmap because
> it just gets an opaque pointer by querying the device tree.

If it's a generic GPIO driver from a code correctness point of view it's
always got a risk of sleeping...

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