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drivers: spi: esp32: add option to handle lines state

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SPI driver is current working for common SPI devices.
However, addressable LED like WS2812 requires MOSI line to be
default LOW during initialization. This PR adds such option.
This has no effect on common SPI operation.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
This commit is contained in:
Sylvio Alves 2023-05-24 11:18:52 -03:00 committed by Chris Friedt
parent 628e3142e5
commit d7bcac091c
3 changed files with 19 additions and 0 deletions
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13
drivers/spi/spi_esp32_spim.c
View file

@ -265,6 +265,7 @@ static int IRAM_ATTR spi_esp32_configure(const struct device *dev,
struct spi_context *ctx = &data->ctx;
spi_hal_context_t *hal = &data->hal;
spi_hal_dev_config_t *hal_dev = &data->dev_config;
spi_dev_t *hw = hal->hw;
int freq;
if (spi_context_configured(ctx, spi_cfg)) {
@ -347,6 +348,17 @@ static int IRAM_ATTR spi_esp32_configure(const struct device *dev,
spi_hal_setup_device(hal, hal_dev);
/* Workaround to handle default state of MISO and MOSI lines */
#ifndef CONFIG_SOC_ESP32
if (cfg->line_idle_low) {
hw->ctrl.d_pol = 0;
hw->ctrl.q_pol = 0;
} else {
hw->ctrl.d_pol = 1;
hw->ctrl.q_pol = 1;
}
#endif
/*
* Workaround for ESP32S3 and ESP32C3 SoC. This dummy transaction is needed to sync CLK and
* software controlled CS when SPI is in mode 3
@ -505,6 +517,7 @@ static const struct spi_driver_api spi_api = {
.dma_host = DT_INST_PROP(idx, dma_host), \
.cs_setup = DT_INST_PROP_OR(idx, cs_setup_time, 0), \
.cs_hold = DT_INST_PROP_OR(idx, cs_hold_time, 0), \
.line_idle_low = DT_INST_PROP(idx, line_idle_low), \
}; \
\
DEVICE_DT_INST_DEFINE(idx, &spi_esp32_init, \

1
drivers/spi/spi_esp32_spim.h
View file

@ -38,6 +38,7 @@ struct spi_esp32_config {
int dma_host;
int cs_setup;
int cs_hold;
bool line_idle_low;
};
struct spi_esp32_data {

5
dts/bindings/spi/espressif,esp32-spi.yaml
View file

@ -76,3 +76,8 @@ properties:
description: |
Chip select hold time setting, see TRF for SOC for details of
timing applied.
line-idle-low:
type: boolean
description: |
Default MISO and MOSI pins GPIO level when idle. Defaults to high by default.