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[2003:c7:874f:2f00:49cd:ad30:8052:4d03]) by smtp.gmail.com with ESMTPSA id hx8-20020a170906846800b00965e839f56bsm4543023ejc.182.2023.05.11.16.14.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 May 2023 16:14:07 -0700 (PDT) From: Boerge Struempfel X-Google-Original-From: Boerge Struempfel Cc: boerge.struempfel@gmail.com, bstruempfel@ultratronik.de, andy.shevchenko@gmail.com, Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/4] spi: Add option to keep the MOSI line low, when it is idle Date: Fri, 12 May 2023 01:13:13 +0200 Message-Id: <20230511231317.158214-1-bstruempfel@ultratronik.de> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230511135632.78344-1-bstruempfel@ultratronik.de> References: <20230511135632.78344-1-bstruempfel@ultratronik.de> MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Some spi controller like the imx spi controller switch the mosi line to high, whenever they are idle. This may not be desired in all use cases. For example neopixel leds can get confused and flicker due to misinterpreting the idle state. Therefore, we introduce a new spi-mode bit, with which the idle behaviour can be overwritten on a per device basis. Changes from V1: - Added patch, introducing the new devicetree binding flag - Split the generic spi part of the patch from the imx-spi specific part - Replaced SPI_CPOL and SPI_CPHA by the combined SPI_MODE_X_MASK bit in the imx-spi.c modebits. - Added the SPI_MOSI_IDLE_LOW bit to spidev Boerge Struempfel (4): spi: dt-bindings: Introduce spi-mosi-idle-low flag spi: add SPI_MOSI_IDLE_LOW mode bit spi: spi-imx: add support for SPI_MOSI_IDLE_LOW mode bit spi: spidev: add SPI_MOSI_IDLE_LOW mode bit .../devicetree/bindings/spi/spi-peripheral-props.yaml | 6 ++++++ drivers/spi/spi-imx.c | 9 ++++++++- drivers/spi/spi.c | 2 ++ drivers/spi/spidev.c | 2 +- include/uapi/linux/spi/spi.h | 3 ++- 5 files changed, 19 insertions(+), 3 deletions(-)