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serial: serial_stm32: Add reset support

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In some cases, UART is configured by early boot stage.
To be sure of the initial state of UART and to avoid
spurious chars on console, reset the serial block before
configuring it.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrice Chotard 2018-12-04 14:11:36 +01:00 committed by Tom Rini
parent 655c6d997d
commit f828fa4d82
1 changed files with 9 additions and 0 deletions
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9
drivers/serial/serial_stm32.c
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@ -7,6 +7,7 @@
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <reset.h>
#include <serial.h>
#include <watchdog.h>
#include <asm/io.h>
@ -171,6 +172,7 @@ static int stm32_serial_probe(struct udevice *dev)
{
struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
struct clk clk;
struct reset_ctl reset;
int ret;
plat->uart_info = (struct stm32_uart_info *)dev_get_driver_data(dev);
@ -185,6 +187,13 @@ static int stm32_serial_probe(struct udevice *dev)
return ret;
}
ret = reset_get_by_index(dev, 0, &reset);
if (!ret) {
reset_assert(&reset);
udelay(2);
reset_deassert(&reset);
}
plat->clock_rate = clk_get_rate(&clk);
if (plat->clock_rate < 0) {
clk_disable(&clk);