feat(st-uart): add initialization with the device tree
Add the pincontrol configuration and clock enable in UART driver
with information found in the device tree.
This patch avoids an issue on STM32MP13x platform because the UART
configuration is reset by the ROM code for UART serial boot
(STM32MP_UART_PROGRAMMER=1).
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I575fd0e1026b857059abcfd4a3166eb3a239e1fd
diff --git a/drivers/st/uart/stm32_uart.c b/drivers/st/uart/stm32_uart.c
index 08bd77b..63970c7 100644
--- a/drivers/st/uart/stm32_uart.c
+++ b/drivers/st/uart/stm32_uart.c
@@ -9,7 +9,9 @@
#include <string.h>
#include <common/bl_common.h>
+#include <drivers/clk.h>
#include <drivers/delay_timer.h>
+#include <drivers/st/stm32_gpio.h>
#include <drivers/st/stm32_uart.h>
#include <drivers/st/stm32_uart_regs.h>
#include <drivers/st/stm32mp_clkfunc.h>
@@ -300,12 +302,14 @@
* @param init: UART initialization parameter.
* @retval UART status.
*/
-
int stm32_uart_init(struct stm32_uart_handle_s *huart,
uintptr_t base_addr,
const struct stm32_uart_init_s *init)
{
int ret;
+ int uart_node;
+ int clk;
+ void *fdt = NULL;
if (huart == NULL || init == NULL || base_addr == 0U) {
return -EINVAL;
@@ -313,6 +317,32 @@
huart->base = base_addr;
+ /* Search UART instance in DT */
+ if (fdt_get_address(&fdt) == 0) {
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ if (fdt == NULL) {
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ uart_node = dt_match_instance_by_compatible(DT_UART_COMPAT, base_addr);
+ if (uart_node == -FDT_ERR_NOTFOUND) {
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ /* Pinctrl initialization */
+ if (dt_set_pinctrl_config(uart_node) != 0) {
+ return -FDT_ERR_BADVALUE;
+ }
+
+ /* Clock initialization */
+ clk = fdt_get_clock_id(uart_node);
+ if (clk < 0) {
+ return -FDT_ERR_NOTFOUND;
+ }
+ clk_enable(clk);
+
/* Disable the peripheral */
stm32_uart_stop(huart->base);