On Thu, Feb 27, 2020 at 05:11:47PM +0100, Boris Brezillon wrote:

Pratyush Yadav [off-list ref] wrote:

quoted

Allow spi devices to express DTR receive and transmit capabilities via
the properties "spi-rx-dtr" and "spi-tx-dtr".

Is the RX/TX granularity really useful?

It's what we do for other properties, and if this is anything like the
other things adding extra wiring you can't assume that the ability to
use the feature for TX implies RX.