Re: [PATCH] virtio: i2c: Allow buffer less transactions

[Viresh Kumar <viresh.kumar@linaro.org>]

On 23-07-21, 10:56, Viresh Kumar wrote:
> The I2C protocol allows requests with no data, like the SMBus Quick
> command, where the command is inferred based on the read/write flag
> itself.
> 
> In order to allow such a request, allocate another bit,
> VIRTIO_I2C_FLAGS_M_RD(1), in the flags to pass the request type, as read
> or write. This was earlier done using the read/write permission to the
> buffer itself.
> 
> This still won't work well if multiple buffers are passed for the same
> request, i.e. the write-read requests, as the VIRTIO_I2C_FLAGS_M_RD flag
> can only be used with a single buffer.
> 
> Coming back to it, there is no need to send multiple buffers with a
> single request. All we need, is a way to group several requests
> together, which we can already do based on the
> VIRTIO_I2C_FLAGS_FAIL_NEXT flag.
> 
> Remove support for multiple buffers within a single request.
> 
> Since we are at very early stage of development currently, we can do
> these modifications without addition of new features or versioning of
> the protocol.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---

Gentle reminder!

-- 
viresh