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drivers: Update Flexcomm Serial driver for clock control

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Use the clock API to get the serial clock frequency

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
This commit is contained in:
Mahesh Mahadevan 2020-08-25 16:04:38 -05:00 • committed by Kumar Gala
commit 3eb3b58bb4
1 changed files with 17 additions and 4 deletions
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21
drivers/serial/uart_mcux_flexcomm.c
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@ -17,14 +17,15 @@
#include <errno.h>
#include <device.h>
#include <drivers/uart.h>
#include <drivers/clock_control.h>
#include <fsl_usart.h>
#include <fsl_clock.h>
#include <soc.h>
#include <fsl_device_registers.h>
struct mcux_flexcomm_config {
USART_Type *base;
uint32_t clock_source;
char *clock_name;
clock_control_subsys_t clock_subsys;
uint32_t baud_rate;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
void (*irq_config_func)(const struct device *dev);
@ -247,8 +248,18 @@ static int mcux_flexcomm_init(const struct device *dev)
const struct mcux_flexcomm_config *config = dev->config;
usart_config_t usart_config;
uint32_t clock_freq;
const struct device *clock_dev;
clock_freq = CLOCK_GetFlexCommClkFreq(config->clock_source);
/* Get the clock frequency */
clock_dev = device_get_binding(config->clock_name);
if (clock_dev == NULL) {
return -EINVAL;
}
if (clock_control_get_rate(clock_dev, config->clock_subsys,
&clock_freq)) {
return -EINVAL;
}
USART_GetDefaultConfig(&usart_config);
usart_config.enableTx = true;
@ -312,7 +323,9 @@ static const struct uart_driver_api mcux_flexcomm_driver_api = {
#define UART_MCUX_FLEXCOMM_DECLARE_CFG(n, IRQ_FUNC_INIT) \
static const struct mcux_flexcomm_config mcux_flexcomm_##n##_config = { \
.base = (USART_Type *)DT_INST_REG_ADDR(n), \
.clock_source = 0, \
.clock_name = DT_INST_CLOCKS_LABEL(n), \
.clock_subsys = \
(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
.baud_rate = DT_INST_PROP(n, current_speed), \
IRQ_FUNC_INIT \
}