stm32: clk: Add 200MHz clock configuration for stm32f746 discovery board
This patch adds 200MHz clock configuration for stm32f746 discovery board.
This patch is based on STM32F4 and emcraft's[1].
[1]: https://github.com/EmcraftSystems/u-boot
Signed-off-by: Toshifumi NISHINAGA <tnishinaga.dev@gmail.com>
diff --git a/drivers/serial/serial_stm32x7.c b/drivers/serial/serial_stm32x7.c
index cfbfab7..592c0bd 100644
--- a/drivers/serial/serial_stm32x7.c
+++ b/drivers/serial/serial_stm32x7.c
@@ -9,6 +9,7 @@
#include <dm.h>
#include <asm/io.h>
#include <serial.h>
+#include <asm/arch/stm32.h>
#include <dm/platform_data/serial_stm32x7.h>
#include "serial_stm32x7.h"
@@ -18,7 +19,20 @@
{
struct stm32x7_serial_platdata *plat = dev->platdata;
struct stm32_usart *const usart = plat->base;
- writel(plat->clock/baudrate, &usart->brr);
+ u32 clock, int_div, frac_div, tmp;
+
+ if (((u32)usart & STM32_BUS_MASK) == APB1_PERIPH_BASE)
+ clock = clock_get(CLOCK_APB1);
+ else if (((u32)usart & STM32_BUS_MASK) == APB2_PERIPH_BASE)
+ clock = clock_get(CLOCK_APB2);
+ else
+ return -EINVAL;
+
+ int_div = (25 * clock) / (4 * baudrate);
+ tmp = ((int_div / 100) << USART_BRR_M_SHIFT) & USART_BRR_M_MASK;
+ frac_div = int_div - (100 * (tmp >> USART_BRR_M_SHIFT));
+ tmp |= (((frac_div * 16) + 50) / 100) & USART_BRR_F_MASK;
+ writel(tmp, &usart->brr);
return 0;
}