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authorPatrice Chotard <patrice.chotard@st.com>2017-07-18 09:29:08 +0200
committerTom Rini <trini@konsulko.com>2017-07-26 11:28:08 -0400
commit27265cee76ee7ee779e2e26549bdedb9d38a56de (patch)
tree72f98dc6633a7711d22b264d8853bfe90060426a /drivers/serial
parent122b2d4763e82e13f9b2735624813266047ddcd5 (diff)
serial: stm32x7: add clk_get_rate() support
Replace proprietary clock_get() by clk_get_rate() The stm32x7 serial driver is now "generic" and can be used by other STM32 SoCs. Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: Vikas MANOCHA <vikas.manocha@st.com>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/serial_stm32x7.c17
-rw-r--r--drivers/serial/serial_stm32x7.h2
2 files changed, 9 insertions, 10 deletions
diff --git a/drivers/serial/serial_stm32x7.c b/drivers/serial/serial_stm32x7.c
index 05c73da2301..bf118a78cf9 100644
--- a/drivers/serial/serial_stm32x7.c
+++ b/drivers/serial/serial_stm32x7.c
@@ -19,16 +19,9 @@ static int stm32_serial_setbrg(struct udevice *dev, int baudrate)
{
struct stm32x7_serial_platdata *plat = dev->platdata;
struct stm32_usart *const usart = plat->base;
- u32 clock, int_div, mantissa, fraction, oversampling;
+ u32 int_div, mantissa, fraction, oversampling;
- 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 = DIV_ROUND_CLOSEST(clock, baudrate);
+ int_div = DIV_ROUND_CLOSEST(plat->clock_rate, baudrate);
if (int_div < 16) {
oversampling = 8;
@@ -101,6 +94,12 @@ static int stm32_serial_probe(struct udevice *dev)
}
#endif
+ plat->clock_rate = clk_get_rate(&clk);
+ if (plat->clock_rate < 0) {
+ clk_disable(&clk);
+ return plat->clock_rate;
+ };
+
/* Disable usart-> disable overrun-> enable usart */
clrbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
setbits_le32(&usart->cr3, USART_CR3_OVRDIS);
diff --git a/drivers/serial/serial_stm32x7.h b/drivers/serial/serial_stm32x7.h
index 42b05f14b52..9fe37af5cc9 100644
--- a/drivers/serial/serial_stm32x7.h
+++ b/drivers/serial/serial_stm32x7.h
@@ -25,7 +25,7 @@ struct stm32_usart {
/* Information about a serial port */
struct stm32x7_serial_platdata {
struct stm32_usart *base; /* address of registers in physical memory */
- unsigned int clock;
+ unsigned long int clock_rate;
};
#define USART_CR1_OVER8 (1 << 15)