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lib: utils/serial: support 'reg-offset' property

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reg-offset property is used for offset to apply to the mapbase
from the start of the registers in 8250 UART. In Linux kernel,
it has been handled in 8250 UART driver.

dt-bindings:
<linux>/Documentation/devicetree/bindings/serial/8250.yaml

Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Zong Li
2022-04-15 02:24:20 +00:00
committed by Anup Patel
parent 3383d6a4d1
commit 5c5cbb53a4
10 changed files with 23 additions and 8 deletions
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7
lib/utils/fdt/fdt_helper.c
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@@ -21,6 +21,7 @@
#define DEFAULT_UART_BAUD 115200
#define DEFAULT_UART_REG_SHIFT 0
#define DEFAULT_UART_REG_IO_WIDTH 1
#define DEFAULT_UART_REG_OFFSET 0
#define DEFAULT_SIFIVE_UART_FREQ 0
#define DEFAULT_SIFIVE_UART_BAUD 115200
@@ -449,6 +450,12 @@ int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
else
uart->reg_io_width = DEFAULT_UART_REG_IO_WIDTH;
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-offset", &len);
if (len > 0 && val)
uart->reg_offset = fdt32_to_cpu(*val);
else
uart->reg_offset = DEFAULT_UART_REG_OFFSET;
return 0;
}