linux-kernel - [PATCH v6 4/7] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

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Date: Sat, 29 Jun 2024 16:06:03 -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>, <corbet@....net>,
        <marcelo.schmitt1@...il.com>
CC: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 4/7] 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.

Acked-by: Nuno Sa <nuno.sa@...log.com>
Reviewed-by: David Lechner <dlechner@...libre.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
 drivers/spi/spi-axi-spi-engine.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 03588fac9215..9e8f2108e279 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_HIGH		BIT(3)
 
 #define SPI_ENGINE_INST_TRANSFER		0x0
 #define SPI_ENGINE_INST_ASSERT			0x1
@@ -137,6 +138,10 @@ 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_HIGH;
+	if (spi->mode & SPI_MOSI_IDLE_LOW)
+		config &= ~SPI_ENGINE_CONFIG_SDO_IDLE_HIGH;
 
 	return config;
 }
@@ -682,9 +687,13 @@ static int spi_engine_probe(struct platform_device *pdev)
 	host->num_chipselect = 8;
 
 	/* Some features depend of the IP core version. */
-	if (ADI_AXI_PCORE_VER_MINOR(version) >= 2) {
-		host->mode_bits |= SPI_CS_HIGH;
-		host->setup = spi_engine_setup;
+	if (ADI_AXI_PCORE_VER_MAJOR(version) >= 1) {
+		if (ADI_AXI_PCORE_VER_MINOR(version) >= 2) {
+			host->mode_bits |= SPI_CS_HIGH;
+			host->setup = spi_engine_setup;
+		}
+		if (ADI_AXI_PCORE_VER_MINOR(version) >= 3)
+			host->mode_bits |= SPI_MOSI_IDLE_LOW | SPI_MOSI_IDLE_HIGH;
 	}
 
 	if (host->max_speed_hz == 0)
-- 
2.43.0