Register the qoriq cpufreq driver as a cooling device, based on the thermal device tree framework. When temperature crosses the passive trip point cpufreq is used to throttle CPUs.
Signed-off-by: Jia Hongtao <hongtao....@freescale.com> Reviewed-by: Scott Wood <scottw...@freescale.com> --- This patch depends on following patches from Scott Wood: http://patchwork.ozlabs.org/patch/519803/ http://patchwork.ozlabs.org/patch/519804/ drivers/cpufreq/qoriq-cpufreq.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/qoriq-cpufreq.c b/drivers/cpufreq/qoriq-cpufreq.c index 4f53fa2..cb1bc3c 100644 --- a/drivers/cpufreq/qoriq-cpufreq.c +++ b/drivers/cpufreq/qoriq-cpufreq.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/cpufreq.h> +#include <linux/cpu_cooling.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> @@ -33,6 +34,7 @@ struct cpu_data { struct clk **pclk; struct cpufreq_frequency_table *table; + struct thermal_cooling_device *cdev; }; /* @@ -292,7 +294,11 @@ static const struct of_device_id node_matches[] __initconst = { static int __init qoriq_cpufreq_init(void) { int ret; - struct device_node *np; + struct device_node *np; + struct device_node *cpu_np; + unsigned int cpu_id; + struct cpufreq_policy cpu_policy; + struct cpu_data *cpud; const struct of_device_id *match; const struct soc_data *data; @@ -309,6 +315,22 @@ static int __init qoriq_cpufreq_init(void) return -ENODEV; ret = cpufreq_register_driver(&qoriq_cpufreq_driver); + + /* Register CPU cooling device for QorIQ platform */ + for_each_node_with_property(cpu_np, "#cooling-cells") { + of_property_read_u32(cpu_np, "reg", &cpu_id); + cpufreq_get_policy(&cpu_policy, cpu_id); + + cpud = cpu_policy.driver_data; + cpud->cdev = of_cpufreq_cooling_register(cpu_np, + cpu_policy.related_cpus); + if (IS_ERR(cpud->cdev) && ERR_PTR(cpud->cdev) != -ENOSYS) + pr_err("Failed to register cooling device cpu%d: %ld\n", + cpu_id, PTR_ERR(cpud->cdev)); + } + + of_node_put(cpu_np); + if (!ret) pr_info("Freescale QorIQ CPU frequency scaling driver\n"); -- 2.1.0.27.g96db324 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
