drivers: uart: atmel_sam: Added reset after error check

[IVandeVeire]

Following the sam4s datasheet, the OVRE, PARE and FRAME flags should be cleared after a uart error occured. This is done writing a 1 to the RSTSTA bit in the UART_CR.

[pdgendt]

Tested on SAM4S custom board, @nandojve any objections?

[nandojve]

I need check all SoC before accept. If there is no regression it is fine for me.

[pdgendt]

I need check all SoC before accept. If there is no regression it is fine for me.

@nandojve I've checked datasheets for sam3x/sam4e/sam4s/same70 that they all have this flag, as these include the driver in the device tree.

Also the uart_sam_configure function already sets the bit, so I guess it should be fine?

zephyr/drivers/serial/uart_sam.c

Lines 179 to 181 in 5876cc5

	uart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX
	| UART_CR_RXDIS | UART_CR_TXDIS
	| UART_CR_RSTSTA;

[nandojve]

I need check all SoC before accept. If there is no regression it is fine for me.

@nandojve I've checked datasheets for sam3x/sam4e/sam4s/same70 that they all have this flag, as these include the driver in the device tree.

Also the uart_sam_configure function already sets the bit, so I guess it should be fine?

It is missing sam4l on your list.

[pdgendt]

It is missing sam4l on your list.

It does not have a compatible = "atmel,sam-uart";

https://github.com/zephyrproject-rtos/zephyr/blob/5876cc53d45201b0f7f185ae9f16c1e992422166/dts/arm/atmel/sam4l.dtsi