linux-kernel - Re: [PATCH v7 09/34] i2c: tegra: Use reset_control

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Message-ID: <20200917123626.GN3515672@ulmo>
Date:   Thu, 17 Sep 2020 14:36:26 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 09/34] i2c: tegra: Use reset_control_reset()

On Wed, Sep 09, 2020 at 01:39:41AM +0300, Dmitry Osipenko wrote:
> Use a single reset_control_reset() instead of assert/deasset couple in
> order to make code cleaner a tad. Note that the reset_control_reset()
> uses 1 microsecond delay instead of 2 that was used previously, but this
> shouldn't matter because one microsecond is a default reset time for most
> of Tegra peripherals and TRM doesn't mention anything special in regards
> to I2C controller's reset propagation time.
> 
> In addition don't ignore potential error of the reset control by emitting
> a noisy warning if it fails, which will indicate an existence of a severe
> problem, while still allow machine to boot up.
> 
> Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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