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drivers: spi: esp32xx: add support for dedicated CS

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Currently the driver only support software controlled CS
defined by cs-gpios property.
This commit enables the possibility of using dedicated CS
by setting the pins on pinctrl and omitting the cs-gpios
property.

Signed-off-by: Lucas Tamborrino <lucas.tamborrino@espressif.com>
This commit is contained in:
Lucas Tamborrino 2023-02-27 16:31:22 -03:00 committed by Carles Cufí
parent 9015f23b75
commit 7f4dadee3a
1 changed files with 15 additions and 2 deletions
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17
drivers/spi/spi_esp32_spim.c
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@ -107,6 +107,10 @@ static int IRAM_ATTR spi_esp32_transfer(const struct device *dev)
hal_trans->tx_bitlen = bit_len;
hal_trans->rx_bitlen = bit_len;
/* keep cs line active ultil last transmission */
hal_trans->cs_keep_active =
(!ctx->num_cs_gpios && (ctx->rx_count > 1 || ctx->tx_count > 1));
/* configure SPI */
spi_hal_setup_trans(hal, hal_dev, hal_trans);
spi_hal_prepare_data(hal, hal_dev, hal_trans);
@ -324,8 +328,7 @@ static int IRAM_ATTR spi_esp32_configure(const struct device *dev,
data->trans_config.line_mode.addr_lines = 1;
data->trans_config.line_mode.cmd_lines = 1;
/* keep cs line after transmission not supported */
data->trans_config.cs_keep_active = 0;
hal_dev->cs_setup = 1;
/* SPI mode */
hal_dev->mode = 0;
@ -339,6 +342,16 @@ static int IRAM_ATTR spi_esp32_configure(const struct device *dev,
spi_hal_setup_device(hal, hal_dev);
/*
* Workaround for ESP32S3 and ESP32C3 SoC. This dummy transaction is needed to sync CLK and
* software controlled CS when SPI is in mode 3
*/
#if defined(CONFIG_SOC_ESP32S3) || defined(CONFIG_SOC_ESP32C3)
if (ctx->num_cs_gpios && (hal_dev->mode & (SPI_MODE_CPOL | SPI_MODE_CPHA))) {
spi_esp32_transfer(dev);
}
#endif
return 0;
}