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drivers: uart: npcx: extend the UART baudrate support

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1. support the baudrate = 3MHz.
2. add baudrate = 115200 setting when UART source clock = 25/30/48/50 MHz.

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
This commit is contained in:
Jun Lin 2024-04-24 10:31:54 +08:00 committed by Alberto Escolar
parent 08fedb4a80
commit 458b219879
1 changed files with 26 additions and 3 deletions
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29
drivers/serial/uart_npcx.c
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@ -119,14 +119,37 @@ static void uart_npcx_pm_policy_state_lock_put(struct uart_npcx_data *data,
/* UART local functions */
static int uart_set_npcx_baud_rate(struct uart_reg *const inst, int baud_rate, int src_clk)
{
/* Fix baud rate to 115200 so far */
/*
* Support two baud rate setting so far:
* - 115200
* - 3000000
*/
if (baud_rate == 115200) {
if (src_clk == 15000000) {
if (src_clk == MHZ(15)) {
inst->UPSR = 0x38;
inst->UBAUD = 0x01;
} else if (src_clk == 20000000) {
} else if (src_clk == MHZ(20)) {
inst->UPSR = 0x08;
inst->UBAUD = 0x0a;
} else if (src_clk == MHZ(25)) {
inst->UPSR = 0x10;
inst->UBAUD = 0x08;
} else if (src_clk == MHZ(30)) {
inst->UPSR = 0x10;
inst->UBAUD = 0x0a;
} else if (src_clk == MHZ(48)) {
inst->UPSR = 0x08;
inst->UBAUD = 0x19;
} else if (src_clk == MHZ(50)) {
inst->UPSR = 0x08;
inst->UBAUD = 0x1a;
} else {
return -EINVAL;
}
} else if (baud_rate == MHZ(3)) {
if (src_clk == MHZ(48)) {
inst->UPSR = 0x08;
inst->UBAUD = 0x0;
} else {
return -EINVAL;
}