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

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Message-ID: <20250620-finer-yoyo-0bcae988a299@spud>
Date: Fri, 20 Jun 2025 14:28:23 +0100
From: Conor Dooley <conor@...nel.org>
To: linux-spi@...r.kernel.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] spi: microchip-core-qspi: Add regular transfers

From: Conor Dooley <conor.dooley@...rochip.com>

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@...rochip.com>
CC: Daire McNamara <daire.mcnamara@...rochip.com>
CC: Mark Brown <broonie@...nel.org>
CC: linux-spi@...r.kernel.org
CC: linux-kernel@...r.kernel.org

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