linux-kernel - Re: [PATCH 2/3] i2c: owl: Add support for atomic transfers

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Message-ID: <20201103205718.GC1583@kunai>
Date:   Tue, 3 Nov 2020 21:57:18 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...il.com>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andreas Färber <afaerber@...e.de>,
        Peter Rosin <peda@...ntia.se>, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-actions@...ts.infradead.org
Subject: Re: [PATCH 2/3] i2c: owl: Add support for atomic transfers

On Fri, Oct 09, 2020 at 12:44:40AM +0300, Cristian Ciocaltea wrote:
> Atomic transfers are required to properly power off a machine through
> an I2C controlled PMIC, such as the Actions Semi ATC260x series.
> 
> System shutdown may happen with interrupts being disabled and, as a
> consequence, the kernel may hang if the driver does not support atomic
> transfers.
> 
> This functionality is essentially implemented by polling the FIFO
> Status register until either Command Execute Completed or NACK Error
> bits are set.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>

Applied to for-next, thanks!


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