[RFC] commands: i2c_write: enable raw write to address

[Sascha Hauer]

On Fri, Feb 09, 2018 at 02:22:24PM +0300, Antony Pavlov wrote:
> On Fri, 9 Feb 2018 09:36:36 +0100
> Sascha Hauer <s.hauer at pengutronix.de> wrote:
> 
> > Hi Antony,
> > 
> > On Thu, Feb 08, 2018 at 10:48:56AM +0300, Antony Pavlov wrote:
> > > Sometimes for communication with a simple I2C devices
> > > (e.g. PCF8574 or TM1650) it's necessary to send only
> > > one data byte into the I2C device.
> > > Current i2c_write command makes this impossible because
> > > you can't just pass 'device address' and 'register number'
> > > (or 'device address' and 'one data byte') to the command.
> > > You always have to pass all three parameters:
> > > 'device address', 'register number' and 'data'.
> > > 
> > > This commit fixes the problem.
> > > 
> > > Sample usage:
> > > 
> > >   barebox at barebox sandbox:/ i2c_write -a 0x24 0x01
> > > 
> > > Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
> > > ---
> > >  commands/i2c.c | 8 ++++++--
> > >  1 file changed, 6 insertions(+), 2 deletions(-)
> > 
> > Looks good to me.
> > 
> > I applied this one despite the [RFC] tag. If for some reason you want to
> > resend this, feel free to do so, but otherwise consider this applied.
> 
> Thanks!
> 
> The patch is short, it's understandable and it fixes the problem.
> I prefere to apply this patch as is.
> 
> I see some inconsistency in drivers/i2c/i2c.c.
> We have i2c_master_send() and i2c_write_reg() functions.
> These functions are intended to make similar work but they are
> written in very different style. I suppose that we can rewrite
> i2c_master_send() (e.g. drop FIXME) and make i2c_write_reg()
> work on top of i2c_master_send(). Any comments?

Rewrite i2c_master_send()? Do you mean rewrite i2c_write_reg() instead?

Sascha

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