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

Alexandru Ardelean
2024-06-26T06:14:16Z

On Wed, Jun 26, 2024 at 12:55 AM Marcelo Schmitt
<marcelo.schmitt@analog.com> wrote:
>
> Implement MOSI idle low and MOSI idle high to better support peripherals
> that request specific MOSI behavior.
>

One minor nitpick.
Feel free to ignore, if there won't be a re-spin.

> 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;

There's a second space after the assignment.
host->mode_bits |=<2 spaces here>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
>
>