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

[Mark Brown]

On Wed, Jul 15, 2026 at 03:29:32PM +0200, Nuno Sá wrote:
> On Wed, Jul 15, 2026 at 02:09:19PM +0100, Mark Brown wrote:

> > 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.

You still need to work out how the ID appears in the byte stream that
gets sent to/from the device, that's way more information than just a
number and not something the byte stream SPI offers is going to cope
well with.

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