Re: [PATCH v6 1/5] spi: dt-bindings: Add spi-device-addr peripheral property

[Nuno Sá]

On Wed, Jul 15, 2026 at 02:09:19PM +0100, Mark Brown wrote:
> On Wed, Jul 15, 2026 at 01:41:04PM +0200, Janani Sunil wrote:
> > Some SPI devices support sharing a single chip select across multiple
> > physical chips by encoding a device address in the SPI frame itself.
> > Add the generic spi-device-addr property for describing these hardware
> > addresses. The property is placed on the SPI peripheral node and may
> > contain multiple addresses.
> 
> This really isn't a generic SPI thing, if nothing else you need *far*
> more information in there about how exactly this would be put onto the
> bus.  If it belongs anywhere outside of the specific device's binding it
> feels like it might be regmap.

Just for some context,

For the analog chip, it can share the same CS line with another 3
identical chips. It has two pins that depending on how they are set act
as the device address (so only one replies to a given transfer -
naturally the peripheral driver needs to setup the correct transfer
and that depends on these pins setup and hence dt property). 

This property reflects that. Apparently some microchip chips are doing something
very similar so Conor proposed a generic property given that we would have at
least 3 users of it.

- Nuno Sá