lkml.org 
[lkml]   [2021]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver
On Mon, Mar 01, 2021 at 05:24:41PM +0530, Viresh Kumar wrote:
> On 01-03-21, 14:41, Jie Deng wrote:
> > +/**
> > + * struct virtio_i2c_req - the virtio I2C request structure
> > + * @out_hdr: the OUT header of the virtio I2C message
> > + * @write_buf: contains one I2C segment being written to the device
> > + * @read_buf: contains one I2C segment being read from the device
> > + * @in_hdr: the IN header of the virtio I2C message
> > + */
> > +struct virtio_i2c_req {
> > + struct virtio_i2c_out_hdr out_hdr;
> > + u8 *write_buf;
> > + u8 *read_buf;
> > + struct virtio_i2c_in_hdr in_hdr;
> > +};
>
> I am not able to appreciate the use of write/read bufs here as we
> aren't trying to read/write data in the same transaction. Why do we
> have two bufs here as well as in specs ?

I²C and SMBus support bidirectional transfers as well. I think two buffers is
the right thing to do.

--
With Best Regards,
Andy Shevchenko


\
 
 \ /
  Last update: 2021-03-01 13:15    [W:0.264 / U:0.788 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site