On Tue, 14 Apr 2020 20:54:49 +0300
Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
> On Tue, Apr 14, 2020 at 8:06 PM Manivannan Sadhasivam <mani@xxxxxxxxxx> wrote:
> > On Tue, Apr 14, 2020 at 07:42:24PM +0300, Andy Shevchenko wrote:
> > > On Tue, Apr 14, 2020 at 6:34 PM <mani@xxxxxxxxxx> wrote:
>
> ...
>
> > > > + reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
> > > > + GPIOD_OUT_LOW);
> > > > + if (IS_ERR(reset_gpio)) {
> > >
> > > > + dev_err(&client->dev, "Failed to acquire reset gpio\n");
> > >
> > > If it's a deferred probe, it would spam the log.
> > >
> >
> > Hmm. But error is an error isn't it? Would you recommend doing a debug print
> > or completely removing the logging?
>
> I would remove completely, but better to wait for Jonathan to comment.
> Maybe he prefers something like
> if (err != EPROBE_DEFER)
> dev_err()
Not fussed. Either drop it or do the check for defer - one I leave up to the
author.
>
> > > > + return PTR_ERR(reset_gpio);
> > > > + }
> > >
> > > ...
> > >
> > > > + static const u8 reset_seq[] = {
> > > > + 0xFF, 0x11, 0xE5, 0x72, 0x8A,
> > > > + };
> > >
> > > I would suggest to comment above from where you got this and the
> > > meaning of the numbers.
> > >
> >
> > The datasheet doesn't specify the meaning of these values. But will add a
> > comment.
>
> Thanks!
>
> > Btw, just noticed that 0xFF is not needed and only 4 values are
> > sufficient for SW reset.
>
> Better to do exactly what datasheet suggests (in case it's not clear
> or deductible what is going on).
>
