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lib: utils: Improve fdt_parse_uart8250() API 

The information parsed by fdt_parse_uart8250() API is not complete.
We need to parse reg-shift and reg-io-width for UART 8520 as well.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel 2020-04-24 15:21:34 +05:30 committed by Anup Patel
parent e6c1345f89
commit 01a8c8eebb
2 changed files with 23 additions and 0 deletions
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2
include/sbi_utils/fdt/fdt_helper.h
View File

@ -14,6 +14,8 @@ struct platform_uart_data {
unsigned long addr;
unsigned long freq;
unsigned long baud;
unsigned long reg_shift;
unsigned long reg_io_width;
};
struct platform_plic_data {

21
lib/utils/fdt/fdt_helper.c
View File

@ -13,6 +13,11 @@
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
#define DEFAULT_UART_FREQ 0
#define DEFAULT_UART_BAUD 115200
#define DEFAULT_UART_REG_SHIFT 0
#define DEFAULT_UART_REG_IO_WIDTH 1
static int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
unsigned long *size)
{
@ -81,10 +86,26 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len);
if (len > 0 && val)
uart->freq = fdt32_to_cpu(*val);
else
uart->freq = DEFAULT_UART_FREQ;
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "current-speed", &len);
if (len > 0 && val)
uart->baud = fdt32_to_cpu(*val);
else
uart->baud = DEFAULT_UART_BAUD;
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-shift", &len);
if (len > 0 && val)
uart->reg_shift = fdt32_to_cpu(*val);
else
uart->reg_shift = DEFAULT_UART_REG_SHIFT;
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-io-width", &len);
if (len > 0 && val)
uart->reg_io_width = fdt32_to_cpu(*val);
else
uart->reg_io_width = DEFAULT_UART_REG_IO_WIDTH;
return 0;
}