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lib: utils/serial: Add PXA UARTs support

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The PXA variant of the uart8250 adds the UART Unit Enable bit (UUE) that
needs to be set to enable the XScale PXA UART. And it is required for
some RISC-V SoCs like the Spacemit K1 that implement the PXA UART.

This introduces the "intel,xscale-uart" compatible to handle setting the
UUE bit.

Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250327-pxa-uart-support-v2-1-c4400c1fcd0b@pigmoral.tech
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Junhui Liu
2025-03-27 14:48:18 +08:00
committed by Anup Patel
parent 3ac49712e3
commit 8fe835303c
6 changed files with 24 additions and 8 deletions
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7
lib/utils/serial/fdt_serial_uart8250.c
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@@ -14,8 +14,9 @@
static int serial_uart8250_init(const void *fdt, int nodeoff,
const struct fdt_match *match)
{
int rc;
struct platform_uart_data uart = { 0 };
ulong caps = (ulong)match->data;
int rc;
rc = fdt_parse_uart_node(fdt, nodeoff, &uart);
if (rc)
@@ -23,13 +24,15 @@ static int serial_uart8250_init(const void *fdt, int nodeoff,
return uart8250_init(uart.addr, uart.freq, uart.baud,
uart.reg_shift, uart.reg_io_width,
uart.reg_offset);
uart.reg_offset, caps);
}
static const struct fdt_match serial_uart8250_match[] = {
{ .compatible = "ns16550" },
{ .compatible = "ns16550a" },
{ .compatible = "snps,dw-apb-uart" },
{ .compatible = "intel,xscale-uart",
.data = (void *)UART_CAP_UUE },
{ },
};