Miquel Raynal <miquel.raynal@bootlin.com> says: Mark pointed out that the DTR capability was not correctly enabled since I had to set the extra ctlr->dtr_caps flag. For testing, I commented out the spi-mem ops/caps and figured out DTR variants were still not picked up. This was due to the spi-mem fallback implementation of ->exec_op() not forwarding the DTR flag. Link: https://patch.msgid.link/20260904-perso-ma35d1-master-v1-0-b6936e8c6fa1@bootlin.com