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drivers: spi: mchp_mss: Add reset support

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Add support to reset the device through a reset controller.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
This commit is contained in:
Sebastian Huber 2025-06-18 04:04:50 +02:00 committed by Daniel DeGrasse
parent 9832973bec
commit 269773fff4
2 changed files with 19 additions and 1 deletions
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18
drivers/spi/spi_mchp_mss.c
View File

@ -16,6 +16,13 @@
LOG_MODULE_REGISTER(mss_spi, CONFIG_SPI_LOG_LEVEL);
/* Is MSS SPI module 'resets' line property defined */
#define MSS_SPI_RESET_ENABLED DT_ANY_INST_HAS_PROP_STATUS_OKAY(resets)
#if MSS_SPI_RESET_ENABLED
#include <zephyr/drivers/reset.h>
#endif
#include "spi_context.h"
/* MSS SPI Register offsets */
@ -102,6 +109,9 @@ struct mss_spi_config {
mm_reg_t base;
uint8_t clk_gen;
int clock_freq;
#if MSS_SPI_RESET_ENABLED
struct reset_dt_spec reset_spec;
#endif
};
struct mss_spi_transfer {
@ -426,6 +436,12 @@ static int mss_spi_init(const struct device *dev)
int ret = 0;
uint32_t control = 0;
#if MSS_SPI_RESET_ENABLED
if (cfg->reset_spec.dev != NULL) {
(void)reset_line_deassert_dt(&cfg->reset_spec);
}
#endif
/* Remove SPI from Reset */
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control &= ~MSS_SPI_CONTROL_RESET;
@ -470,6 +486,8 @@ static DEVICE_API(spi, mss_spi_driver_api) = {
static const struct mss_spi_config mss_spi_config_##n = { \
.base = DT_INST_REG_ADDR(n), \
.clock_freq = DT_INST_PROP(n, clock_frequency), \
IF_ENABLED(DT_INST_NODE_HAS_PROP(n, resets), \
(.reset_spec = RESET_DT_SPEC_INST_GET(n),)) \
}; \
\
static struct mss_spi_data mss_spi_data_##n = { \

2
dts/bindings/spi/microchip,mpfs-spi.yaml
View File

@ -5,7 +5,7 @@ description: Microchip Polarfire SOC SPI controller
compatible: "microchip,mpfs-spi"
include: spi-controller.yaml
include: [spi-controller.yaml, reset-device.yaml]
properties:
reg: