On 6/4/24 5:43 PM, Marcelo Schmitt wrote: > Implement MOSI idle low and MOSI idle high to better support peripherals > that request specific MOSI behavior. > > Signed-off-by: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx> > --- > 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; I think we need a version check instead of setting the flags unconditionally here since older versions of the AXI SPI Engine won't support this feature.
