Messages in this thread Patch in this message | | | From | Qing Zhang <> | Subject | [PATCH v4 3/7] MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq | Date | Wed, 10 Mar 2021 15:56:35 +0800 |
| |
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> ---
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; + 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
| |