[PATCH v5 4/7] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

Marcelo Schmitt
2024-06-25T21:55:13Z

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

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

diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 0aa31d745734..5a88d31ca758 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
@@ -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_HIGH;
+ if (spi->mode & SPI_MOSI_IDLE_LOW)
+ config &= ~SPI_ENGINE_CONFIG_SDO_IDLE_HIGH;

return config;
}
@@ -646,6 +651,9 @@ static int spi_engine_probe(struct platform_device *pdev)

host->dev.of_node = pdev->dev.of_node;
host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE;
+ if (ADI_AXI_PCORE_VER_MAJOR(version) >= 1 &&
+ ADI_AXI_PCORE_VER_MINOR(version) >= 3)
+ host->mode_bits |= 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