[PATCH v2 07/23] thermal: armada: use the resource managed registration helper alternative

Miquel Raynal
2018-06-25T15:12:23Z

Current use of thermal_zone_device_register() triggers a warning at boot
and should be replaced by devm_thermal_zone_of_sensor_register(). This
allows better handling of multiple thermal zones for later multi-sensors
support.

Also change the driver data to embed a new structure to make the
difference between legacy data (which needs to be cleaned) and
syscon-related data.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/thermal/armada_thermal.c | 128 ++++++++++++++++++++++++++++++++-------
1 file changed, 107 insertions(+), 21 deletions(-)

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index be346c6afde2..8a734264ecdd 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -64,6 +64,7 @@ struct armada_thermal_data;

/* Marvell EBU Thermal Sensor Dev Structure */
struct armada_thermal_priv {
+ struct device *dev;
struct regmap *syscon;
char zone_name[THERMAL_NAME_LENGTH];
struct armada_thermal_data *data;
@@ -95,6 +96,26 @@ struct armada_thermal_data {
unsigned int syscon_status_off;
};

+struct armada_drvdata {
+ enum drvtype {
+ LEGACY,
+ SYSCON
+ } type;
+ union {
+ struct armada_thermal_priv *priv;
+ struct thermal_zone_device *tz;
+ } data;
+};
+
+/*
+ * struct armada_thermal_sensor - hold the information of one thermal sensor
+ * @thermal: pointer to the local private structure
+ * @tzd: pointer to the thermal zone device
+ */
+struct armada_thermal_sensor {
+ struct armada_thermal_priv *priv;
+};
+
static void armadaxp_init(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
@@ -243,16 +264,14 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
return reg & priv->data->is_valid_bit;
}

-static int armada_get_temp(struct thermal_zone_device *thermal,
- int *temp)
+static int armada_read_sensor(struct armada_thermal_priv *priv, long *temp)
{
- struct armada_thermal_priv *priv = thermal->devdata;
u32 reg, div;
s64 sample, b, m;

/* Valid check */
if (priv->data->is_valid && !priv->data->is_valid(priv)) {
- dev_err(&thermal->device,
+ dev_err(priv->dev,
"Temperature sensor reading not valid\n");
return -EIO;
}
@@ -278,7 +297,39 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
return 0;
}

-static struct thermal_zone_device_ops ops = {
+static int armada_get_temp_legacy(struct thermal_zone_device *thermal,
+ int *temp)
+{
+ struct armada_thermal_priv *priv = thermal->devdata;
+ long temperature;
+ int ret;
+
+ /* Do the actual reading */
+ ret = armada_read_sensor(priv, &temperature);
+ *temp = temperature;
+
+ return ret;
+}
+
+static struct thermal_zone_device_ops legacy_ops = {
+ .get_temp = armada_get_temp_legacy,
+};
+
+static int armada_get_temp(void *_sensor, int *temp)
+{
+ struct armada_thermal_sensor *sensor = _sensor;
+ struct armada_thermal_priv *priv = sensor->priv;
+ long temperature;
+ int ret;
+
+ /* Do the actual reading */
+ ret = armada_read_sensor(priv, &temperature);
+ *temp = temperature;
+
+ return ret;
+}
+
+static struct thermal_zone_of_device_ops of_ops = {
.get_temp = armada_get_temp,
};

@@ -480,7 +531,9 @@ static void armada_set_sane_name(struct platform_device *pdev,

static int armada_thermal_probe(struct platform_device *pdev)
{
- struct thermal_zone_device *thermal;
+ struct thermal_zone_device *tz;
+ struct armada_thermal_sensor *sensors;
+ struct armada_drvdata *drvdata;
const struct of_device_id *match;
struct armada_thermal_priv *priv;
int ret;
@@ -493,11 +546,13 @@ static int armada_thermal_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;

+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
priv->data = (struct armada_thermal_data *)match->data;

- /* Ensure device name is correct for the thermal core */
- armada_set_sane_name(pdev, priv);
-
/*
* Legacy DT bindings only described "control1" register (also referred
* as "control MSB" on old documentation). Then, bindings moved to cover
@@ -510,35 +565,66 @@ static int armada_thermal_probe(struct platform_device *pdev)
* is to define an overall system controller and put the thermal node
* into it, which requires the use of regmaps across all the driver.
*/
- if (IS_ERR(syscon_node_to_regmap(pdev->dev.parent->of_node)))
+ if (IS_ERR(syscon_node_to_regmap(pdev->dev.parent->of_node))) {
+ /* Ensure device name is correct for the thermal core */
+ armada_set_sane_name(pdev, priv);
+
ret = armada_thermal_probe_legacy(pdev, priv);
- else
- ret = armada_thermal_probe_syscon(pdev, priv);
+ if (ret)
+ return ret;

+ priv->data->init(pdev, priv);
+
+ tz = thermal_zone_device_register(priv->zone_name, 0, 0, priv,
+ &legacy_ops, NULL, 0, 0);
+ if (IS_ERR(tz)) {
+ dev_err(&pdev->dev,
+ "Failed to register thermal zone device\n");
+ return PTR_ERR(tz);
+ }
+
+ drvdata->type = LEGACY;
+ drvdata->data.tz = tz;
+ platform_set_drvdata(pdev, drvdata);
+
+ return 0;
+ }
+
+ ret = armada_thermal_probe_syscon(pdev, priv);
if (ret)
return ret;

priv->data->init(pdev, priv);

- thermal = thermal_zone_device_register(priv->zone_name, 0, 0, priv,
- &ops, NULL, 0, 0);
- if (IS_ERR(thermal)) {
+ sensors = devm_kzalloc(&pdev->dev, sizeof(struct armada_thermal_sensor),
+ GFP_KERNEL);
+ if (!sensors)
+ return -ENOMEM;
+
+ sensors->priv = priv;
+
+ tz = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, sensors,
+ &of_ops);
+ if (IS_ERR(tz)) {
dev_err(&pdev->dev,
- "Failed to register thermal zone device\n");
- return PTR_ERR(thermal);
+ "Failed to register thermal sensor (err: %ld)\n",
+ PTR_ERR(tz));
+ return PTR_ERR(tz);
}

- platform_set_drvdata(pdev, thermal);
+ drvdata->type = SYSCON;
+ drvdata->data.priv = priv;
+ platform_set_drvdata(pdev, drvdata);

return 0;
}

static int armada_thermal_exit(struct platform_device *pdev)
{
- struct thermal_zone_device *armada_thermal =
- platform_get_drvdata(pdev);
+ struct armada_drvdata *drvdata = platform_get_drvdata(pdev);

- thermal_zone_device_unregister(armada_thermal);
+ if (drvdata->type == LEGACY)
+ thermal_zone_device_unregister(drvdata->data.tz);

return 0;
}
--
2.14.1