[PATCH v4 0/2] spi: stm32_qspi: use QSPI bus as 8 lines communication channel

From: patrice.chotard
Date: Tue Aug 23 2022 - 03:59:35 EST


From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>

The goal of this series is to allow to use QSPI bus as a 8 lines communication
channel for specific purpose.

The QSPI block offers the possibility to communicate with 2 flashes in
parrallel using the dual flash mode, 8 data lines are then used.
Usage of cs-gpios populated and spi-tx-bus-width / spi-rx-bus-width both set to 8,
is needed to enable dual flash mode.

The addition of the legacy transfer_one_message() spi callback is also needed
as currently the stm32-qspi driver only supports spi_controller_mem_ops API.


Patrice Chotard (2):
ARM: dts: stm32: Create separate pinmux for qspi cs pin in
stm32mp15-pinctrl.dtsi
spi: stm32_qspi: Add transfer_one_message() spi callback

arch/arm/boot/dts/stm32mp15-pinctrl.dtsi | 50 ++++++----
arch/arm/boot/dts/stm32mp157c-ev1.dts | 12 ++-
drivers/spi/spi-stm32-qspi.c | 118 +++++++++++++++++++++--
3 files changed, 152 insertions(+), 28 deletions(-)

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2.25.1