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@xxxxxxxxxxxxxx>
---
Changes since implicit v1 ("cpufreq: imx6q/thermal: imx: move CPU cooling device from thermal to cpufreq",
id:20171115092332.9320-1-bst@xxxxxxxxxxxxxx):
- create cooling device in imx_thermal in case no #cooling-cells
property is available instead of removing it (DT stability)
- fix indentation
---
drivers/cpufreq/imx6q-cpufreq.c | 38 +++++++++++++++++++++++++++++++++
drivers/thermal/imx_thermal.c | 29 +++++++++++++++++++++----
2 files changed, 63 insertions(+), 4 deletions(-)
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 83cf631fc9bc..47995beed3ac 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -9,6 +9,7 @@
#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/of.h>
@@ -50,6 +51,7 @@ 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;
@@ -191,6 +193,33 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
return 0;
}
+static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
+{
+ struct device_node *np = of_node_get(cpu_dev->of_node);
+ u32 capacitance = 0;
+
+ if (WARN_ON(!np))
+ return;
+
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ of_property_read_u32(np, "dynamic-power-coefficient",
+ &capacitance);
+
+ cdev = of_cpufreq_power_cooling_register(np, policy,
+ capacitance, NULL);
+
+ if (IS_ERR(cdev)) {
+ dev_err(cpu_dev,
+ "running cpufreq without cooling device: %ld\n",
+ PTR_ERR(cdev));
+
+ cdev = NULL;
+ }
+ }
+
+ of_node_put(np);
+}
+
static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
{
int ret;
@@ -202,13 +231,22 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
return ret;
}
+static int imx6q_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_cooling_unregister(cdev);
+
+ return 0;
+}
+
static struct cpufreq_driver imx6q_cpufreq_driver = {
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.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,
};
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 334d98be03b9..d701298f3fd1 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -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 +645,28 @@ 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 *cpu_dev = get_cpu_device(0);
+ struct device_node *np = of_node_get(cpu_dev->of_node);
+ 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 +747,10 @@ 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;
}
--
2.17.1
--
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