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Subject: Re: [PATCH] i2c: stm32f7: Add atomic_xfer method to driver
From:   Sean Nyekjaer <sean@geanix.com>
In-Reply-To: <ZKKZ4qUw5pKVt1T1@shikoro>
Date:   Mon, 3 Jul 2023 12:21:02 +0200
Cc:     Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>,
        Alain Volmat <alain.volmat@foss.st.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        linux-i2c@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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Message-Id: <48234852-3206-4F73-A7AD-EE6EBE83D774@geanix.com>
References: <20230509132159.4160984-1-sean@geanix.com>
 <ZJV0/cbjn1Qa62u+@shikoro> <9BEDFE6D-AE5E-46F1-A1BF-A19C6F5130F6@geanix.com>
 <ZKKZ4qUw5pKVt1T1@shikoro>
To:     Wolfram Sang <wsa@kernel.org>
Precedence: bulk


> On 3 Jul 2023, at 11.50, Wolfram Sang <wsa@kernel.org> wrote:
>=20
>=20
>>> Will DMA actually run in atomic mode?
>=20
>> Atomic is mainly(only) used for writing a single register in the PMIC
>> for the stpmic.
>=20
> And this most probably during shutdown...
>=20
>> Guess that will not trigger any DMA use.
>=20
> ... so I'd be very surprised if DMA is operational that late. I think =
we
> can rule that out independent of I2C messages to be trasnferred.
>=20

Yes, I=E2=80=99ll submit a V2 without the DMA functionality.

/Sean=