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// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) "psci-of: " fmt
#include <common.h>
#include <of.h>
#include <asm/psci.h>
#include <linux/arm-smccc.h>
int of_psci_fixup(struct device_node *root, unsigned long psci_version)
{
struct device_node *psci;
int ret;
const char *compat;
struct device_node *cpus, *cpu;
psci = of_create_node(root, "/psci");
if (!psci)
return -EINVAL;
if (psci_version >= ARM_PSCI_VER_1_0) {
compat = "arm,psci-1.0";
} else if (psci_version >= ARM_PSCI_VER_0_2) {
compat = "arm,psci-0.2";
} else {
pr_err("Unsupported PSCI version %ld\n", psci_version);
return -EINVAL;
}
cpus = of_find_node_by_path_from(root, "/cpus");
if (!cpus) {
pr_err("Cannot find /cpus node, PSCI fixup aborting\n");
return -EINVAL;
}
cpu = cpus;
while (1) {
cpu = of_find_node_by_type(cpu, "cpu");
if (!cpu)
break;
of_property_write_string(cpu, "enable-method", "psci");
pr_debug("Fixed %s\n", cpu->full_name);
}
ret = of_property_write_string(psci, "compatible", compat);
if (ret)
return ret;
ret = of_property_write_string(psci, "method", "smc");
if (ret)
return ret;
return 0;
}
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