devicetree: spi: stm32h7: Allow to enable SPI FIFO from DT

Allow to enable/disable the STM32 SPI FIFO usage from
devicetree.

Signed-off-by: Daniel Gaston Ochoa <dgastonochoa@gmail.com>

drivers/spi/spi_ll_stm32.c

@@ -1146,7 +1146,9 @@ static void spi_stm32_irq_config_func_##id(const struct device *dev)		\
 #define SPI_DMA_STATUS_SEM(id)
 #endif
 
-
+#define SPI_SUPPORTS_FIFO(id)	DT_INST_NODE_HAS_PROP(id, fifo_enable)
+#define SPI_GET_FIFO_PROP(id)	DT_INST_PROP(id, fifo_enable)
+#define SPI_FIFO_ENABLED(id)	COND_CODE_1(SPI_SUPPORTS_FIFO(id), (SPI_GET_FIFO_PROP(id)), (0))
 
 #define STM32_SPI_INIT(id)						\
 STM32_SPI_IRQ_HANDLER_DECL(id);						\
@@ -1161,6 +1163,7 @@ static const struct spi_stm32_config spi_stm32_cfg_##id = {		\
 	.pclken = pclken_##id,						\
 	.pclk_len = DT_INST_NUM_CLOCKS(id),				\
 	.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(id),			\
+	.fifo_enabled = SPI_FIFO_ENABLED(id),				\
 	STM32_SPI_IRQ_HANDLER_FUNC(id)					\
 	IF_ENABLED(DT_HAS_COMPAT_STATUS_OKAY(st_stm32_spi_subghz),	\
 		(.use_subghzspi_nss =					\

drivers/spi/spi_ll_stm32.h

@@ -34,6 +34,7 @@ struct spi_stm32_config {
 #endif
 	size_t pclk_len;
 	const struct stm32_pclken *pclken;
+	bool fifo_enabled;
 };
 
 #ifdef CONFIG_SPI_STM32_DMA

dts/bindings/spi/st,stm32h7-spi.yaml

@@ -27,3 +27,7 @@ properties:
     description: |
       (Master SS Idleness) minimum clock inserted between
       start and first data transaction.
+
+  fifo-enable:
+    type: boolean
+    description: Enable the SPI FIFO usage for performance improvement.