Re: [PATCH v7 3/7] iio: adc: mcp3564: Add support for spi-device-addr

[Marius.Cristea]

On Wed, 2026-07-22 at 17:45 +0100, Conor Dooley wrote:
> On Wed, Jul 22, 2026 at 09:54:15AM +0200, Janani Sunil wrote:
> > Read the generic spi-device-addr property when determining the
> > hardware
> > device address. Fall back to the deprecated microchip,hw-device-
> > address
> > property to preserve compatibility with existing device trees.
> > 
> > The device address remains 1 when neither property is present.
> > 
> > Signed-off-by: Janani Sunil <janani.sunil@xxxxxxxxxx>
> > ---
> >  drivers/iio/adc/mcp3564.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/adc/mcp3564.c b/drivers/iio/adc/mcp3564.c
> > index 36675563829e..71deb05e878e 100644
> > --- a/drivers/iio/adc/mcp3564.c
> > +++ b/drivers/iio/adc/mcp3564.c
> > @@ -1122,7 +1122,9 @@ static int mcp3564_config(struct iio_dev
> > *indio_dev, bool *use_internal_vref_att
> >  	 * addresses are available when multiple devices are
> > present on the same
> >  	 * SPI bus with only one Chip Select line for all devices.
> >  	 */
> > -	device_property_read_u32(dev, "microchip,hw-device-
> > address", &tmp);
> > +	ret = device_property_read_u32(dev, "spi-device-addr",
> > &tmp);
> > +	if (ret)
> > +		device_property_read_u32(dev, "microchip,hw-
> > device-address", &tmp);
> 
> Same on this one, shouldn't it check the return value so that the
> below
> check of temp > 3 doesn't just pass with the default value of tmp?
> 

Default hardware address is 0x01, unless a special order with custom
hardware address is made. I think is safe to try to communicate with
the default HW address.

> >  
> >  	if (tmp > 3) {
> >  		dev_err_probe(dev, tmp,
> > 
> > -- 
> > 2.43.0
> >