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

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Date: Wed, 26 Jun 2024 09:14:02 +0300
From: Alexandru Ardelean <aardelean@...libre.com>
To: Marcelo Schmitt <marcelo.schmitt@...log.com>
Cc: 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, 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: Re: [PATCH v5 4/7] spi: spi-axi-spi-engine: Add support for MOSI idle configuration

On Wed, Jun 26, 2024 at 12:55 AM Marcelo Schmitt
<marcelo.schmitt@...log.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@...log.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
>
>