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author | 2020-02-22 08:08:49 +0800 | |
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committer | 2020-03-12 11:40:57 +0100 | |
commit | 34471abfc8fedcebf7c45a5e37ef383b8bb16de3 (patch) | |
tree | 7f83aabd1fa4ebbe3e672c8996d25614b959932d /drivers/thermal | |
parent | dt-bindings: fsl: scu: add thermal binding (diff) | |
download | linux-34471abfc8fedcebf7c45a5e37ef383b8bb16de3.tar.gz linux-34471abfc8fedcebf7c45a5e37ef383b8bb16de3.tar.bz2 linux-34471abfc8fedcebf7c45a5e37ef383b8bb16de3.zip |
thermal: of-thermal: add API for getting sensor ID from DT
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>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1582330132-13461-2-git-send-email-Anson.Huang@nxp.com
Diffstat (limited to 'drivers/thermal')
-rw-r--r-- | drivers/thermal/of-thermal.c | 62 |
1 files changed, 46 insertions, 16 deletions
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c index ef0baa954ff0..874a47d6923f 100644 --- a/drivers/thermal/of-thermal.c +++ b/drivers/thermal/of-thermal.c @@ -449,6 +449,50 @@ 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) + pr_warn("%pOFn: too many cells in sensor specifier %d\n", + sensor_specs.np, sensor_specs.args_count); + + *id = sensor_specs.args_count ? sensor_specs.args[0] : 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 +543,22 @@ 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); |