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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <libfdt.h>
#include <sbi/sbi_error.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/serial/fdt_serial.h>
/* List of FDT serial drivers generated at compile time */
extern const struct fdt_driver *const fdt_serial_drivers[];
int fdt_serial_init(const void *fdt)
{
const void *prop;
int noff = -1, len, coff, rc;
/* Find offset of node pointed to by stdout-path */
coff = fdt_path_offset(fdt, "/chosen");
if (-1 < coff) {
prop = fdt_getprop(fdt, coff, "stdout-path", &len);
if (prop && len) {
const char *sep, *start = prop;
/* The device path may be followed by ':' */
sep = strchr(start, ':');
if (sep)
noff = fdt_path_offset_namelen(fdt, prop,
sep - start);
else
noff = fdt_path_offset(fdt, prop);
}
}
/* First check DT node pointed by stdout-path */
if (-1 < noff) {
rc = fdt_driver_init_by_offset(fdt, noff, fdt_serial_drivers);
if (rc != SBI_ENODEV)
return rc;
}
/* Lastly check all DT nodes */
return fdt_driver_init_one(fdt, fdt_serial_drivers);
}
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