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Subject[PATCH v4 8/8] PM / devfreq: exynos-bus: Register cooling device
Date
This patch registers the Exynos Bus-Frequency scaling device
as a cooling device of thermal management.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/devfreq/exynos-bus.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index c25658b26598..1c7521b65c2f 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -15,6 +15,7 @@
#include <linux/clk.h>
#include <linux/devfreq.h>
#include <linux/devfreq-event.h>
+#include <linux/devfreq_cooling.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
@@ -41,6 +42,8 @@ struct exynos_bus {
struct clk *clk;
unsigned int voltage_tolerance;
unsigned int ratio;
+
+ struct thermal_cooling_device *cdev;
};

/*
@@ -468,6 +471,19 @@ static int exynos_bus_probe(struct platform_device *pdev)
goto err;
}

+ /*
+ * Register devfreq cooling device if thermal DT code
+ * takes care of matching them.
+ */
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ bus->cdev = of_devfreq_cooling_register(np, bus->devfreq);
+ if (IS_ERR(bus->cdev)) {
+ dev_err(dev, "running exynos-bus without cooling device\n");
+ bus->cdev = NULL;
+ }
+ }
+ of_node_put(np);
+
goto out;
passive:
/* Initialize the struct profile and governor data for passive device */
@@ -514,6 +530,16 @@ static int exynos_bus_probe(struct platform_device *pdev)
return ret;
}

+static int exynos_bus_remove(struct platform_device *pdev)
+{
+ struct exynos_bus *bus = platform_get_drvdata(pdev);
+
+ if (bus->cdev)
+ devfreq_cooling_unregister(bus->cdev);
+
+ return 0;
+}
+
#ifdef CONFIG_PM_SLEEP
static int exynos_bus_resume(struct device *dev)
{
@@ -556,6 +582,7 @@ static int exynos_bus_suspend(struct device *dev)

static struct platform_driver exynos_bus_platdrv = {
.probe = exynos_bus_probe,
+ .remove = exynos_bus_remove,
.driver = {
.name = "exynos-bus",
.pm = &exynos_bus_pm,
--
1.9.1
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