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

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Date:   Tue, 23 Aug 2022 09:58:48 +0200
From:   <patrice.chotard@...s.st.com>
To:     Mark Brown <broonie@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     <linux-spi@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <christophe.kerello@...s.st.com>,
        <patrice.chotard@...s.st.com>
Subject: [PATCH v4 0/2] spi: stm32_qspi: use QSPI bus as 8 lines communication channel

From: Patrice Chotard <patrice.chotard@...s.st.com>

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(-)

-- 
2.25.1