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lib: utils: Add fdt_parse_uart8250_node() function

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We add fdt_parse_uart8250_node() function which will allow us
to parse a particular DT node as UART 8250 node. This will be
useful in parsing the node pointed by stdout-path.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-04-25 18:33:54 +05:30
committed by Anup Patel
parent 01a8c8eebb
commit 0a0093b0bc
2 changed files with 26 additions and 14 deletions
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37
lib/utils/fdt/fdt_helper.c
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@@ -58,21 +58,15 @@ static int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
return 0;
}
int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
const char *compatible)
int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{
int nodeoffset, len, rc;
fdt32_t *val;
int len, rc;
const fdt32_t *val;
unsigned long reg_addr, reg_size;
/**
* TODO: We don't know how to handle multiple nodes with the same
* compatible sring. Just return the first node for now.
*/
nodeoffset = fdt_node_offset_by_compatible(fdt, -1, compatible);
if (nodeoffset < 0)
return nodeoffset;
if (nodeoffset < 0 || !uart || !fdt)
return SBI_ENODEV;
rc = fdt_get_node_addr_size(fdt, nodeoffset, &reg_addr, &reg_size);
if (rc < 0 || !reg_addr || !reg_size)
@@ -80,8 +74,8 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
uart->addr = reg_addr;
/**
* UART address is mandaotry. clock-frequency and current-speed may not
* be present. Don't return error.
* UART address is mandaotry. clock-frequency and current-speed
* may not be present. Don't return error.
*/
val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len);
if (len > 0 && val)
@@ -110,6 +104,21 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
return 0;
}
int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
const char *compatible)
{
int nodeoffset;
if (!compatible || !uart || !fdt)
return SBI_ENODEV;
nodeoffset = fdt_node_offset_by_compatible(fdt, -1, compatible);
if (nodeoffset < 0)
return nodeoffset;
return fdt_parse_uart8250_node(fdt, nodeoffset, uart);
}
int fdt_parse_plic(void *fdt, struct platform_plic_data *plic,
const char *compatible)
{