linux-kernel - Re: [PATCH 03/12] i2c: core: introduce callbacks for atomic transfers

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Date:   Mon, 15 Apr 2019 23:57:48 +0200
From:   Stefan Lengfeld <contact@...fanchrist.eu>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Peter Rosin <peda@...ntia.se>, linux-omap@...r.kernel.org,
        linux-tegra@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 03/12] i2c: core: introduce callbacks for atomic transfers

Hi Wolfram,

On Wed, Apr 03, 2019 at 02:40:10PM +0200, Wolfram Sang wrote:
> We had the request to access devices very late when interrupts are not
> available anymore multiple times now. Mostly to prepare shutdown or
> reboot. Allow adapters to specify a specific callback for this case.
> Note that we fall back to the generic {master|smbus}_xfer callback if
> this new atomic one is not present. This is intentional to preserve the
> previous behaviour and avoid regressions. Because there are drivers not
> using interrupts or because it might have worked "accidently" before.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Tested-by: Stefan Lengfeld <contact@...fanchrist.eu>

Kind regards,
Stefan