refactor(st): configure UART baudrate

Add the possibility to configure console UART baudrate, it can be passed
as a command line parameter with STM32MP_UART_BAUDRATE. The default value
remains 115200.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: I000df70c10b2b4dac1449556596f9820c36cf243

docs/plat/stm32mp1.rst

@@ -127,6 +127,8 @@ Other configuration flags:
   | Default: stm32mp157c-ev1.dtb
 - | ``STM32MP_EARLY_CONSOLE``: to enable early traces before clock driver is setup.
   | Default: 0 (disabled)
+- | ``STM32MP_UART_BAUDRATE``: to select UART baud rate.
+  | Default: 115200
 - | ``STM32_TF_VERSION``: to manage BL2 monotonic counter.
   | Default: 0
 

plat/st/common/stm32mp_common.c

@@ -210,7 +210,7 @@ static void set_console(uintptr_t base, uint32_t clk_rate)
 	unsigned int console_flags;
 
 	if (console_stm32_register(base, clk_rate,
-				   STM32MP_UART_BAUDRATE, &console) == 0) {
+				   (uint32_t)STM32MP_UART_BAUDRATE, &console) == 0) {
 		panic();
 	}
 

plat/st/stm32mp1/platform.mk

@@ -10,6 +10,7 @@ BL2_AT_EL3		:=	1
 USE_COHERENT_MEM	:=	0
 
 STM32MP_EARLY_CONSOLE	?=	0
+STM32MP_UART_BAUDRATE	?=	115200
 
 # Allow TF-A to concatenate BL2 & BL32 binaries in a single file,
 # share DTB file between BL2 and BL32
@@ -172,6 +173,7 @@ $(eval $(call assert_numerics,\
 		PLAT_PARTITION_MAX_ENTRIES \
 		STM32_TF_A_COPIES \
 		STM32_TF_VERSION \
+		STM32MP_UART_BAUDRATE \
 )))
 
 $(eval $(call add_defines,\
@@ -189,6 +191,7 @@ $(eval $(call add_defines,\
 		STM32MP_SDMMC \
 		STM32MP_SPI_NAND \
 		STM32MP_SPI_NOR \
+		STM32MP_UART_BAUDRATE \
 		STM32MP_UART_PROGRAMMER \
 		STM32MP_USB_PROGRAMMER \
 		STM32MP_USE_STM32IMAGE \

plat/st/stm32mp1/stm32mp1_def.h

@@ -202,7 +202,6 @@ enum ddr_type {
 #define USART6_BASE			U(0x44003000)
 #define UART7_BASE			U(0x40018000)
 #define UART8_BASE			U(0x40019000)
-#define STM32MP_UART_BAUDRATE		U(115200)
 
 /* For UART crash console */
 #define STM32MP_DEBUG_USART_BASE	UART4_BASE