linux-kernel - Re: [PATCH] mmc: mmc_spi: Use proper debounce time for CD GPIO

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Message-ID: <20191108205311.GD23750@amd>
Date:   Fri, 8 Nov 2019 21:53:11 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pavel Machek <pavel@...x.de>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: mmc_spi: Use proper debounce time for CD GPIO

On Fri 2019-11-08 17:09:00, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> According to the comment, board files used to specify 1 ms for the
> debounce time. gpiod_set_debounce() needs the debounce time to be
> specified in units of microseconds, so make sure to multiply the value
> by 1000.
> 
> Note that, according to the git log, the board files actually did
> specify 1 us for bounce times, but that seems really low. Device tree
> bindings for this type of GPIO typically specify the debounce times in
> milliseconds, so setting this default value to 1 ms seems like it would
> be somewhat safer.
> 
> Signed-off-by: Thierry Reding <treding@...dia.com>

Acked-by: Pavel Machek <pavel@...x.de>

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