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cpufreq: imx6q/thermal: imx: register cooling device depending on OF

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The cooling device should be part of the i.MX cpufreq driver, but it
cannot be removed for the sake of DT stability. So turn the cooling
device registration into a separate function and perform the
registration only if the CPU OF node does not have the #cooling-cells
property.

Use of_cpufreq_power_cooling_register in imx_thermal code to link the
cooling device to the device tree node provided.

This makes it possible to bind the cpufreq cooling device to a custom
thermal zone via a cooling-maps entry like:

	cooling-maps {
		map0 {
			trip = <&board_alert>;
			cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};

Assuming a cpu node exists with label "cpu0" and #cooling-cells
property.

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bastian Stender
2018-06-08 11:06:39 +02:00
committed by Rafael J. Wysocki
parent 1111b7836c
commit a1d0015423
2 changed files with 45 additions and 4 deletions
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28
drivers/thermal/imx_thermal.c
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@@ -3,6 +3,7 @@
// Copyright 2013 Freescale Semiconductor, Inc.
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/delay.h>
@@ -644,6 +645,27 @@ static const struct of_device_id of_imx_thermal_match[] = {
};
MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
/*
* Create cooling device in case no #cooling-cells property is available in
* CPU node
*/
static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
{
struct device_node *np = of_get_cpu_node(data->policy->cpu, NULL);
int ret;
if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
data->cdev = cpufreq_cooling_register(data->policy);
if (IS_ERR(data->cdev)) {
ret = PTR_ERR(data->cdev);
cpufreq_cpu_put(data->policy);
return ret;
}
}
return 0;
}
static int imx_thermal_probe(struct platform_device *pdev)
{
struct imx_thermal_data *data;
@@ -724,12 +746,10 @@ static int imx_thermal_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
}
data->cdev = cpufreq_cooling_register(data->policy);
if (IS_ERR(data->cdev)) {
ret = PTR_ERR(data->cdev);
ret = imx_thermal_register_legacy_cooling(data);
if (ret) {
dev_err(&pdev->dev,
"failed to register cpufreq cooling device: %d\n", ret);
cpufreq_cpu_put(data->policy);
return ret;
}