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MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq 

Get the fixed-clock from the CPU0 node of the device tree.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Qing Zhang 2021-03-15 15:50:00 +08:00 committed by Thomas Bogendoerfer
parent 8e2fe0ecfb
commit 95b56e884a
1 changed files with 24 additions and 0 deletions
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24
arch/mips/loongson64/time.c
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@ -11,9 +11,33 @@
#include <asm/hpet.h>
#include <loongson.h>
#include <linux/clk.h>
#include <linux/of_clk.h>
void __init plat_time_init(void)
{
struct clk *clk;
struct device_node *np;
if (loongson_sysconf.fw_interface == LOONGSON_DTB) {
of_clk_init(NULL);
np = of_get_cpu_node(0, NULL);
if (!np) {
pr_err("Failed to get CPU node\n");
return;
}
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
return;
}
cpu_clock_freq = clk_get_rate(clk);
clk_put(clk);
}
/* setup mips r4k timer */
mips_hpt_frequency = cpu_clock_freq / 2;