Sat, Mar 23, 2024 at 06:29:18PM +0000, Jonathan Cameron kirjoitti:
> On Tue, 19 Mar 2024 10:28:31 -0500
> David Lechner <dlechner@xxxxxxxxxxxx> wrote:
> > On Tue, Mar 19, 2024 at 10:01 AM Andy Shevchenko
> > <andy.shevchenko@xxxxxxxxx> wrote:
> > > On Tue, Mar 19, 2024 at 4:28 PM David Lechner <dlechner@xxxxxxxxxxxx> wrote:
...
> > > > + ret = device_property_match_property_string(dev, "adi,spi-mode",
> > > > + ad7944_spi_modes,
> > > > + ARRAY_SIZE(ad7944_spi_modes));
> > > > + if (ret < 0) {
> > > > + if (ret != -EINVAL)
> > > > + return dev_err_probe(dev, ret,
> > > > + "getting adi,spi-mode property failed\n");
> > >
> > > > - adc->spi_mode = ret;
> > > > - } else {
> > >
> > > Actually we may even leave these unchanged
> > >
> > > > /* absence of adi,spi-mode property means default mode */
> > > > adc->spi_mode = AD7944_SPI_MODE_DEFAULT;
> > > > + } else {
> > > > + adc->spi_mode = ret;
> > > > }
> > >
> > > ret = device_property_match_property_string(dev, "adi,spi-mode",
> > > ad7944_spi_modes,
> > >
> > > ARRAY_SIZE(ad7944_spi_modes));
> > > if (ret >= 0) {
> > > adc->spi_mode = ret;
> > > } else if (ret != -EINVAL) {
> > > return dev_err_probe(dev, ret,
> > > "getting adi,spi-mode
> > > property failed\n");
> > > } else {
> > > /* absence of adi,spi-mode property means default mode */
> > > adc->spi_mode = AD7944_SPI_MODE_DEFAULT;
> > > }
> > >
> > > But I can admit this is not an often used approach.
> > >
> >
> > I think Jonathan prefers to have the error path first, so I would like
> > to wait and see if he has an opinion here.
> I do prefer error paths first. Thanks.
Still the above can be refactored to have one line less
ret = device_property_match_property_string(dev, "adi,spi-mode",
ad7944_spi_modes,
ARRAY_SIZE(ad7944_spi_modes));
if (ret == -EINVAL) {
/* absence of adi,spi-mode property means default mode */
adc->spi_mode = AD7944_SPI_MODE_DEFAULT;
} else if (ret < 0) {
return dev_err_probe(dev, ret, "getting adi,spi-mode property failed\n");
} else {
adc->spi_mode = ret;
}
--
With Best Regards,
Andy Shevchenko
