linux-kernel - Re: [PATCH v1 05/10] cpufreq: imx6q: Use auto-registration of thermal cooling device

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Message-ID: <20190117044906.jomvwecvjrkgsuak@vireshk-i7>
Date:   Thu, 17 Jan 2019 10:19:06 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        edubezval@...il.com, swboyd@...omium.org, dianders@...omium.org,
        mka@...omium.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Anson Huang <anson.huang@....com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v1 05/10] cpufreq: imx6q: Use auto-registration of
 thermal cooling device

On 14-01-19, 22:04, Amit Kucheria wrote:
> Use the CPUFREQ_AUTO_REGISTER_COOLING_DEV flag to allow cpufreq core to
> automatically register as a thermal cooling device.
> 
> This allows removal of boiler plate code from the driver.
> 
> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> ---
>  drivers/cpufreq/imx6q-cpufreq.c | 18 ++----------------
>  1 file changed, 2 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
> index 9fedf627e000..ffb00291f48e 100644
> --- a/drivers/cpufreq/imx6q-cpufreq.c
> +++ b/drivers/cpufreq/imx6q-cpufreq.c
> @@ -9,7 +9,6 @@
>  #include <linux/clk.h>
>  #include <linux/cpu.h>
>  #include <linux/cpufreq.h>
> -#include <linux/cpu_cooling.h>
>  #include <linux/err.h>
>  #include <linux/module.h>
>  #include <linux/nvmem-consumer.h>
> @@ -52,7 +51,6 @@ static struct clk_bulk_data clks[] = {
>  };
>  
>  static struct device *cpu_dev;
> -static struct thermal_cooling_device *cdev;
>  static bool free_opp;
>  static struct cpufreq_frequency_table *freq_table;
>  static unsigned int max_freq;
> @@ -193,16 +191,6 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
>  	return 0;
>  }
>  
> -static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
> -{
> -	cdev = of_cpufreq_cooling_register(policy);
> -
> -	if (!cdev)
> -		dev_err(cpu_dev,
> -			"running cpufreq without cooling device: %ld\n",
> -			PTR_ERR(cdev));
> -}
> -
>  static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
>  {
>  	int ret;
> @@ -216,20 +204,18 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
>  
>  static int imx6q_cpufreq_exit(struct cpufreq_policy *policy)
>  {
> -	cpufreq_cooling_unregister(cdev);
> -
>  	return 0;
>  }

Remove the empty routine as well.

>  static struct cpufreq_driver imx6q_cpufreq_driver = {
> -	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
> +	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
> +		 CPUFREQ_AUTO_REGISTER_COOLING_DEV,
>  	.verify = cpufreq_generic_frequency_table_verify,
>  	.target_index = imx6q_set_target,
>  	.get = cpufreq_generic_get,
>  	.init = imx6q_cpufreq_init,
>  	.exit = imx6q_cpufreq_exit,
>  	.name = "imx6q-cpufreq",
> -	.ready = imx6q_cpufreq_ready,
>  	.attr = cpufreq_generic_attr,
>  	.suspend = cpufreq_generic_suspend,
>  };
> -- 
> 2.17.1

-- 
viresh