From: Anson.Huang@nxp.com
To: robh+dt@kernel.org, mark.rutland@arm.com, corbet@lwn.net,
shawnguo@kernel.org, s.hauer@pengutronix.de,
kernel@pengutronix.de, festevam@gmail.com,
catalin.marinas@arm.com, will.deacon@arm.com,
rui.zhang@intel.com, edubezval@gmail.com,
daniel.lezcano@linaro.org, aisheng.dong@nxp.com,
ulf.hansson@linaro.org, peng.fan@nxp.com,
mchehab+samsung@kernel.org, linux@roeck-us.net,
daniel.baluta@nxp.com, maxime.ripard@bootlin.com,
horms+renesas@verge.net.au, olof@lixom.net,
jagan@amarulasolutions.com, bjorn.andersson@linaro.org,
leonard.crestez@nxp.com, dinguyen@kernel.org,
enric.balletbo@collabora.com, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org
Cc: Linux-imx@nxp.com
Subject: [PATCH V15 2/5] thermal: of-thermal: add API for getting sensor ID from DT
Date: Tue, 18 Jun 2019 10:18:17 +0800 [thread overview]
Message-ID: <20190618021820.14885-2-Anson.Huang@nxp.com> (raw)
In-Reply-To: <20190618021820.14885-1-Anson.Huang@nxp.com>
From: Anson Huang <Anson.Huang@nxp.com>
This patch adds new API thermal_zone_of_get_sensor_id() to
provide the feature of getting sensor ID from DT thermal
zone's node. It's useful for thermal driver to register the
specific thermal zone devices from DT in a common way.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
---
Changes since V14:
- improve the commit message, document and comment, no code change.
---
Documentation/thermal/sysfs-api.txt | 8 +++++
drivers/thermal/of-thermal.c | 65 ++++++++++++++++++++++++++++---------
include/linux/thermal.h | 10 ++++++
3 files changed, 67 insertions(+), 16 deletions(-)
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index c3fa500..5d3f84e 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -159,6 +159,14 @@ temperature) and throttle appropriate devices.
for the thermal zone device, which might be useful for platform
drivers for temperature calculations.
+1.1.9 int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
+ struct device_node *sensor_np,
+ u32 *id)
+
+ This interface is used to get the sensor id from the given thermal
+ zone in DT, which might be useful for thermal drivers to register
+ specific thermal zone device in a common way.
+
1.2 thermal cooling device interface
1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
void *devdata, struct thermal_cooling_device_ops *)
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index dc5093b..2422cc4 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -449,6 +449,53 @@ thermal_zone_of_add_sensor(struct device_node *zone,
}
/**
+ * thermal_zone_of_get_sensor_id - get sensor ID from a DT thermal zone
+ * @tz_np: a valid thermal zone device node.
+ * @sensor_np: a sensor node of a valid sensor device.
+ * @id: the sensor ID returned if success.
+ *
+ * This function will get sensor ID from a given thermal zone node and
+ * the sensor node must match the temperature provider @sensor_np.
+ *
+ * Return: 0 on success, proper error code otherwise.
+ */
+
+int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
+ struct device_node *sensor_np,
+ u32 *id)
+{
+ struct of_phandle_args sensor_specs;
+ int ret;
+
+ ret = of_parse_phandle_with_args(tz_np,
+ "thermal-sensors",
+ "#thermal-sensor-cells",
+ 0,
+ &sensor_specs);
+ if (ret)
+ return ret;
+
+ if (sensor_specs.np != sensor_np) {
+ of_node_put(sensor_specs.np);
+ return -ENODEV;
+ }
+
+ if (sensor_specs.args_count >= 1) {
+ *id = sensor_specs.args[0];
+ WARN(sensor_specs.args_count > 1,
+ "%pOFn: too many cells in sensor specifier %d\n",
+ sensor_specs.np, sensor_specs.args_count);
+ } else {
+ *id = 0;
+ }
+
+ of_node_put(sensor_specs.np);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_of_get_sensor_id);
+
+/**
* thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
* @dev: a valid struct device pointer of a sensor device. Must contain
* a valid .of_node, for the sensor node.
@@ -499,36 +546,22 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
sensor_np = of_node_get(dev->of_node);
for_each_available_child_of_node(np, child) {
- struct of_phandle_args sensor_specs;
int ret, id;
/* For now, thermal framework supports only 1 sensor per zone */
- ret = of_parse_phandle_with_args(child, "thermal-sensors",
- "#thermal-sensor-cells",
- 0, &sensor_specs);
+ ret = thermal_zone_of_get_sensor_id(child, sensor_np, &id);
if (ret)
continue;
- if (sensor_specs.args_count >= 1) {
- id = sensor_specs.args[0];
- WARN(sensor_specs.args_count > 1,
- "%pOFn: too many cells in sensor specifier %d\n",
- sensor_specs.np, sensor_specs.args_count);
- } else {
- id = 0;
- }
-
- if (sensor_specs.np == sensor_np && id == sensor_id) {
+ if (id == sensor_id) {
tzd = thermal_zone_of_add_sensor(child, sensor_np,
data, ops);
if (!IS_ERR(tzd))
tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
- of_node_put(sensor_specs.np);
of_node_put(child);
goto exit;
}
- of_node_put(sensor_specs.np);
}
exit:
of_node_put(sensor_np);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 15a4ca5..5edffe6 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -375,6 +375,9 @@ struct thermal_trip {
/* Function declarations */
#ifdef CONFIG_THERMAL_OF
+int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
+ struct device_node *sensor_np,
+ u32 *id);
struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops);
@@ -386,6 +389,13 @@ struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
#else
+
+static int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
+ struct device_node *sensor_np,
+ u32 *id)
+{
+ return -ENOENT;
+}
static inline struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops)
--
2.7.4
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next prev parent reply other threads:[~2019-06-18 2:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 2:18 [PATCH V15 1/5] dt-bindings: fsl: scu: add thermal binding Anson.Huang
2019-06-18 2:18 ` Anson.Huang [this message]
2019-06-18 2:18 ` [PATCH V15 3/5] thermal: imx_sc: add i.MX system controller thermal support Anson.Huang
2019-06-18 2:18 ` [PATCH V15 4/5] defconfig: arm64: " Anson.Huang
2019-06-18 2:18 ` [PATCH V15 5/5] arm64: dts: imx: add i.MX8QXP " Anson.Huang
2019-06-24 8:04 ` [PATCH V15 1/5] dt-bindings: fsl: scu: add thermal binding Anson Huang
2019-07-24 3:16 ` Anson Huang
2019-08-28 9:14 ` Zhang Rui
2019-08-28 9:20 ` Anson Huang
2019-10-23 2:37 ` Anson Huang
2020-02-19 14:21 ` Anson Huang
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