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drivers/uart: stm32f1: Add remap support for dt configured pinctrl

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On stm32f1 series, device pinctrl configuration could be modified
thanks to remapping capability.
Remapping allows to provide alternate pinctrl configuration to a
peripheral device and applies to all impacted pins.

So, specifically for stm32f1 series, apply remapping when required
before proceeding with pin configuration.
Additionally, because remapping is defined individually for each pin,
apply a function on pinctrl configuration to check remapping setting
coherency accorss pins.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2020-08-12 13:33:30 +02:00 • committed by Kumar Gala
commit 346d2ab92f
1 changed files with 40 additions and 0 deletions
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40
drivers/serial/uart_stm32.c
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@ -680,6 +680,46 @@ static int uart_stm32_init(const struct device *dev)
/* Configure dt provided device signals when available */
if (config->pinctrl_list_size != 0) {
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl)
int remap;
/* Check that remap configuration is coherent across pins */
remap = stm32_dt_pinctrl_remap_check(config->pinctrl_list,
config->pinctrl_list_size);
if (remap < 0) {
return remap;
}
/* A valid remapping configuration is provided */
/* Apply remapping before proceeding with pin configuration */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
switch ((uint32_t)UART_STRUCT(dev)) {
#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart1), okay)
case DT_REG_ADDR(DT_NODELABEL(usart1)):
if (remap == REMAP_FULL) {
LL_GPIO_AF_EnableRemap_USART1();
}
break;
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart2), okay)
case DT_REG_ADDR(DT_NODELABEL(usart2)):
if (remap == REMAP_FULL) {
LL_GPIO_AF_EnableRemap_USART2();
}
break;
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart3), okay)
case DT_REG_ADDR(DT_NODELABEL(usart3)):
if (remap == REMAP_FULL) {
LL_GPIO_AF_EnableRemap_USART3();
} else if (remap == REMAP_1) {
LL_GPIO_AF_RemapPartial_USART3();
}
break;
#endif
}
#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl) */
stm32_dt_pinctrl_configure(config->pinctrl_list,
config->pinctrl_list_size);
}