[PATCH v5 3/7] MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq
From: Qing Zhang <hidden>
Date: 2021-03-15 07:51:11
Also in:
linux-mips, lkml
Subsystem:
mips, mips/loongson64 architecture, the rest · Maintainers:
Thomas Bogendoerfer, Huacai Chen, Jiaxun Yang, Linus Torvalds
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 <redacted> Tested-by: Ming Wang <redacted> --- v4-v5: - Delete clk initializer arch/mips/loongson64/time.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/arch/mips/loongson64/time.c b/arch/mips/loongson64/time.c
index 91e842b58365..f6d2c1e30570 100644
--- a/arch/mips/loongson64/time.c
+++ b/arch/mips/loongson64/time.c@@ -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;
--
2.20.1