linux-kernel - [PATCH v3 4/6] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

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Date: Tue, 4 Jun 2024 19:43:26 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <broonie@...nel.org>, <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <jic23@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <nuno.sa@...log.com>, <dlechner@...libre.com>,
        <marcelo.schmitt1@...il.com>
CC: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 4/6] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

Implement MOSI idle low and MOSI idle high to better support peripherals
that request specific MOSI behavior.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
 drivers/spi/spi-axi-spi-engine.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 0aa31d745734..549f03069d0e 100644
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -41,6 +41,7 @@
 #define SPI_ENGINE_CONFIG_CPHA			BIT(0)
 #define SPI_ENGINE_CONFIG_CPOL			BIT(1)
 #define SPI_ENGINE_CONFIG_3WIRE			BIT(2)
+#define SPI_ENGINE_CONFIG_SDO_IDLE		BIT(3)
 
 #define SPI_ENGINE_INST_TRANSFER		0x0
 #define SPI_ENGINE_INST_ASSERT			0x1
@@ -132,6 +133,10 @@ static unsigned int spi_engine_get_config(struct spi_device *spi)
 		config |= SPI_ENGINE_CONFIG_CPHA;
 	if (spi->mode & SPI_3WIRE)
 		config |= SPI_ENGINE_CONFIG_3WIRE;
+	if (spi->mode & SPI_MOSI_IDLE_HIGH)
+		config |= SPI_ENGINE_CONFIG_SDO_IDLE;
+	if (spi->mode & SPI_MOSI_IDLE_LOW)
+		config &= ~SPI_ENGINE_CONFIG_SDO_IDLE;
 
 	return config;
 }
@@ -645,7 +650,8 @@ static int spi_engine_probe(struct platform_device *pdev)
 		return ret;
 
 	host->dev.of_node = pdev->dev.of_node;
-	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE;
+	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE | SPI_MOSI_IDLE_LOW
+			  | SPI_MOSI_IDLE_HIGH;
 	host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
 	host->max_speed_hz = clk_get_rate(spi_engine->ref_clk) / 2;
 	host->transfer_one_message = spi_engine_transfer_one_message;
-- 
2.43.0