Re: [PATCH v4 3/7] MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq
From: Sergei Shtylyov <hidden>
Date: 2021-03-10 08:51:28
Also in:
linux-devicetree, lkml
Hello! On 10.03.2021 10:56, Qing Zhang wrote:
quoted hunk ↗ jump to hunk
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> --- v3-v4: Standard submission of information Add return after error 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..2d84f9b20a9b 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 = NULL;
You don't seem to need this initializer.
+ 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;