[PATCH v2 7/7] LoongArch: Parsing CPU-related information from DTS

[Binbin Zhou <zhoubinbin@loongson.cn>]

Generally, we can get cpu-related information, such as model name, from
/proc/cpuinfo. for DT-based systems, we need to parse the relevant
information from DTS.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Hongliang Wang <wanghongliang@loongson.cn>
---
 arch/loongarch/kernel/env.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
index 6b3bfb0092e6..0191fe20b535 100644
--- a/arch/loongarch/kernel/env.c
+++ b/arch/loongarch/kernel/env.c
@@ -5,13 +5,16 @@
  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  */
 #include <linux/acpi.h>
+#include <linux/clk.h>
 #include <linux/efi.h>
 #include <linux/export.h>
 #include <linux/memblock.h>
+#include <linux/of_clk.h>
 #include <asm/early_ioremap.h>
 #include <asm/bootinfo.h>
 #include <asm/loongson.h>
 #include <asm/setup.h>
+#include <asm/time.h>
 
 u64 efi_system_table;
 struct loongson_system_configuration loongson_sysconf;
@@ -34,9 +37,39 @@ void __init init_environ(void)
 	efi_system_table = fw_arg2;
 }
 
+static int __init fdt_cpu_clk_init(void)
+{
+	struct clk *clk;
+	struct device_node *np;
+
+	np = of_get_cpu_node(0, NULL);
+	if (!np)
+		return -ENODEV;
+
+	clk = of_clk_get(np, 0);
+	if (IS_ERR(clk))
+		return -ENODEV;
+
+	cpu_clock_freq = clk_get_rate(clk);
+	clk_put(clk);
+
+	return 0;
+}
+late_initcall(fdt_cpu_clk_init);
+
 static int __init init_cpu_fullname(void)
 {
 	int cpu;
+	char *prop;
+	struct device_node *root;
+
+	/* Parsing cpuname from DTS model property */
+	root = of_find_node_by_path("/");
+	if (root) {
+		of_property_read_string(root, "model", (const char **)&prop);
+		if (prop)
+			loongson_sysconf.cpuname = strsep(&prop, " ");
+	}
 
 	if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
 		for (cpu = 0; cpu < NR_CPUS; cpu++)
-- 
2.39.3