thermal: armada: get rid of the ->is_valid() pointer

The implementation of armada_is_valid() is very simple and is the same
across all the versions of the IP since the ->is_valid_bit has been
introduced. Simplify the structure by getting rid of the function
pointer and calling directly the function.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/armada_thermal.c

@@ -83,9 +83,6 @@ struct armada_thermal_data {
 	void (*init)(struct platform_device *pdev,
 		     struct armada_thermal_priv *priv);
 
-	/* Test for a valid sensor value (optional) */
-	bool (*is_valid)(struct armada_thermal_priv *);
-
 	/* Formula coeficients: temp = (b - m * reg) / div */
 	s64 coef_b;
 	s64 coef_m;
@@ -267,6 +264,9 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
 {
 	u32 reg;
 
+	if (!priv->data->is_valid_bit)
+		return true;
+
 	regmap_read(priv->syscon, priv->data->syscon_status_off, &reg);
 
 	return reg & priv->data->is_valid_bit;
@@ -357,7 +357,7 @@ static int armada_get_temp_legacy(struct thermal_zone_device *thermal,
 	int ret;
 
 	/* Valid check */
-	if (priv->data->is_valid && !priv->data->is_valid(priv)) {
+	if (armada_is_valid(priv)) {
 		dev_err(priv->dev,
 			"Temperature sensor reading not valid\n");
 		return -EIO;
@@ -411,7 +411,6 @@ static const struct armada_thermal_data armadaxp_data = {
 };
 
 static const struct armada_thermal_data armada370_data = {
-	.is_valid = armada_is_valid,
 	.init = armada370_init,
 	.is_valid_bit = BIT(9),
 	.temp_shift = 10,
@@ -424,7 +423,6 @@ static const struct armada_thermal_data armada370_data = {
 };
 
 static const struct armada_thermal_data armada375_data = {
-	.is_valid = armada_is_valid,
 	.init = armada375_init,
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
@@ -438,7 +436,6 @@ static const struct armada_thermal_data armada375_data = {
 };
 
 static const struct armada_thermal_data armada380_data = {
-	.is_valid = armada_is_valid,
 	.init = armada380_init,
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
@@ -453,7 +450,6 @@ static const struct armada_thermal_data armada380_data = {
 };
 
 static const struct armada_thermal_data armada_ap806_data = {
-	.is_valid = armada_is_valid,
 	.init = armada_ap806_init,
 	.is_valid_bit = BIT(16),
 	.temp_shift = 0,
@@ -470,7 +466,6 @@ static const struct armada_thermal_data armada_ap806_data = {
 };
 
 static const struct armada_thermal_data armada_cp110_data = {
-	.is_valid = armada_is_valid,
 	.init = armada_cp110_init,
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,