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spi: spi-gpio: Add support for MOSI idle state configuration

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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>
This commit is contained in:
Marcelo Schmitt 2024-07-12 16:21:23 -03:00 committed by Mark Brown
parent 320f669309
commit 927d382c7e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 1 deletions
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12
drivers/spi/spi-gpio.c
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@ -236,6 +236,14 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
}
}
static void spi_gpio_set_mosi_idle(struct spi_device *spi)
{
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
gpiod_set_value_cansleep(spi_gpio->mosi,
!!(spi->mode & SPI_MOSI_IDLE_HIGH));
}
static int spi_gpio_setup(struct spi_device *spi)
{
struct gpio_desc *cs;
@ -389,7 +397,8 @@ static int spi_gpio_probe(struct platform_device *pdev)
host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
host->mode_bits = SPI_3WIRE | SPI_3WIRE_HIZ | SPI_CPHA | SPI_CPOL |
SPI_CS_HIGH | SPI_LSB_FIRST;
SPI_CS_HIGH | SPI_LSB_FIRST | SPI_MOSI_IDLE_LOW |
SPI_MOSI_IDLE_HIGH;
if (!spi_gpio->mosi) {
/* HW configuration without MOSI pin
*
@ -414,6 +423,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
host->flags |= SPI_CONTROLLER_GPIO_SS;
bb->chipselect = spi_gpio_chipselect;
bb->set_line_direction = spi_gpio_set_direction;
bb->set_mosi_idle = spi_gpio_set_mosi_idle;
if (host->flags & SPI_CONTROLLER_NO_TX) {
bb->txrx_word[SPI_MODE_0] = spi_gpio_spec_txrx_word_mode0;