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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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4
include/sbi_utils/serial/uart8250.h
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@@ -12,7 +12,9 @@
#include <sbi/sbi_types.h>
#define UART_CAP_UUE BIT(0) /* Check UUE capability for XScale PXA UARTs */
int uart8250_init(unsigned long base, u32 in_freq, u32 baudrate, u32 reg_shift,
u32 reg_width, u32 reg_offset);
u32 reg_width, u32 reg_offset, u32 caps);
#endif