spi: spi-gpio: Add support for MOSI idle state configuration
Implement MOSI idle low and MOSI idle high to better support peripherals that request specific MOSI behavior. Acked-by: Nuno Sa <nuno.sa@analog.com> Reviewed-by: David Lechner <dlechner@baylibre.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/629c55a10005ba26825c3a6a19184372ef81b3e1.1720810545.git.marcelo.schmitt@analog.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -236,6 +236,14 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
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}
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}
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static void spi_gpio_set_mosi_idle(struct spi_device *spi)
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{
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struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
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gpiod_set_value_cansleep(spi_gpio->mosi,
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!!(spi->mode & SPI_MOSI_IDLE_HIGH));
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}
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static int spi_gpio_setup(struct spi_device *spi)
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{
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struct gpio_desc *cs;
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@ -389,7 +397,8 @@ static int spi_gpio_probe(struct platform_device *pdev)
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host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
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host->mode_bits = SPI_3WIRE | SPI_3WIRE_HIZ | SPI_CPHA | SPI_CPOL |
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SPI_CS_HIGH | SPI_LSB_FIRST;
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SPI_CS_HIGH | SPI_LSB_FIRST | SPI_MOSI_IDLE_LOW |
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SPI_MOSI_IDLE_HIGH;
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if (!spi_gpio->mosi) {
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/* HW configuration without MOSI pin
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*
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@ -414,6 +423,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
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host->flags |= SPI_CONTROLLER_GPIO_SS;
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bb->chipselect = spi_gpio_chipselect;
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bb->set_line_direction = spi_gpio_set_direction;
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bb->set_mosi_idle = spi_gpio_set_mosi_idle;
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if (host->flags & SPI_CONTROLLER_NO_TX) {
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bb->txrx_word[SPI_MODE_0] = spi_gpio_spec_txrx_word_mode0;
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