[PATCH v2 0/3] spi: microchip-core-qspi: Add regular transfers

From: Conor Dooley
Date: Fri Jun 20 2025 - 09:31:03 EST


From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

Hey,

This is a v2 of a patchset I sent about this time last year, adding the
regular transfer_one_message op to the microchip-core-qspi driver. In that
v1 Mark expressed his dislike for that op, so v2 is using
prepare/unprepare/transfer_one instead. The unprepare implementation still
contains the 750 us delay that the driver had back in v1. I've heard a
suggestion internally as to why this is needed, but it was unsubstantiated,
so I still have no justification for it. I held off on sending a v2 because
of a lack of explanation for the delay, but I don't wanna hold off forever
for something I might never understand.

Cheers,
Conor.

v1: https://lore.kernel.org/linux-spi/20240612-brigade-shell-1f626e7e592f@spud/

CC: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
CC: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>
CC: Mark Brown <broonie@xxxxxxxxxx>
CC: linux-spi@xxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx

Conor Dooley (2):
spi: microchip-core-qspi: set min_speed_hz during probe
spi: microchip-core-qspi: remove unused param from
mchp_coreqspi_write_op()

Cyril Jean (1):
spi: microchip-core-qspi: Add regular transfers

drivers/spi/spi-microchip-core-qspi.c | 226 +++++++++++++++++++++++---
1 file changed, 204 insertions(+), 22 deletions(-)

--
2.45.2