linux-kernel - [PATCH v3 3/7] thermal: core: Add late init hook to cooling device ops

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Date:   Wed, 16 Oct 2019 15:37:17 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     edubezval@...il.com, rui.zhang@...el.com, ulf.hansson@...aro.org,
        daniel.lezcano@...aro.org, bjorn.andersson@...aro.org,
        agross@...nel.org
Cc:     amit.kucheria@...durent.com, mark.rutland@....com,
        rjw@...ysocki.net, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/7] thermal: core: Add late init hook to cooling device ops

Add a hook in thermal_cooling_device_ops to be called after
the cooling device has been initialized and registered
but before binding it to a thermal zone.

In this patch series it is used to hook up a power domain
to the device pointer of cooling device.

It can be used for any other relevant late initializations
of a cooling device as well.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---
 drivers/thermal/thermal_core.c | 13 +++++++++++++
 include/linux/thermal.h        |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 886e8fa..c2ecb73 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -994,6 +994,19 @@ __thermal_cooling_device_register(struct device_node *np,
 	list_add(&cdev->node, &thermal_cdev_list);
 	mutex_unlock(&thermal_list_lock);
 
+	/* Call into cdev late initialization if defined */
+	if (cdev->ops->late_init) {
+		result = cdev->ops->late_init(cdev);
+		if (result) {
+			ida_simple_remove(&thermal_cdev_ida, cdev->id);
+			put_device(&cdev->device);
+			mutex_lock(&thermal_list_lock);
+			list_del(&cdev->node);
+			mutex_unlock(&thermal_list_lock);
+			return ERR_PTR(result);
+		}
+	}
+
 	/* Update binding information for 'this' new cdev */
 	bind_cdev(cdev);
 
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index e45659c..e94b3de 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -125,6 +125,7 @@ struct thermal_cooling_device_ops {
 			   struct thermal_zone_device *, unsigned long, u32 *);
 	int (*power2state)(struct thermal_cooling_device *,
 			   struct thermal_zone_device *, u32, unsigned long *);
+	int (*late_init)(struct thermal_cooling_device *);
 };
 
 struct thermal_cooling_device {
-- 
2.1.4