linux-kernel - Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

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Date:   Tue, 29 Jun 2021 13:11:20 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Jie Deng <jie.deng@...el.com>, linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, jasowang@...hat.com,
        andriy.shevchenko@...ux.intel.com, conghui.chen@...el.com,
        arnd@...db.de, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com, Sergey.Semin@...kalelectronics.ru,
        rppt@...nel.org, loic.poulain@...aro.org, tali.perry1@...il.com,
        u.kleine-koenig@...gutronix.de, bjorn.andersson@...aro.org,
        yu1.wang@...el.com, shuo.a.liu@...el.com, stefanha@...hat.com,
        pbonzini@...hat.com
Subject: Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver


> The case when ``length of \field{write_buf}''=0, and at the same time,
> ``length of \field{read_buf}''=0 is called not-a-read-write request
> and result for such a request is I2C device specific.

Obviously, I don't know much about the specs and their wording. Still I
wonder if we can't call it a zero length transfer? This is allowed by
the I2C standard and SMBus has even a proper name for it (SMBUS_QUICK).
From my point of view, I would not say it is device specific because
devices are expected to ACK such a message.


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