In order to support other similar SoC, with different sensor
coeficients, this commit adds the coeficients to the per-variant
structure, instead of having the formula hardcoded.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
---
drivers/thermal/armada_thermal.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index c5db071..4de6e56 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -53,6 +53,11 @@ struct armada_thermal_data {
/* Test for a valid sensor value (optional) */
bool (*is_valid)(struct armada_thermal_priv *);
+
+ /* Formula coeficients: temp = (b + m * reg) / div */
+ unsigned long coef_b;
+ unsigned long coef_m;
+ unsigned long coef_div;
};
static void armadaxp_init_sensor(struct armada_thermal_priv *priv)
@@ -111,6 +116,7 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
{
struct armada_thermal_priv *priv = thermal->devdata;
unsigned long reg;
+ unsigned long m, b, div;
/* Valid check */
if (priv->data->is_valid && !priv->data->is_valid(priv)) {
@@ -121,7 +127,13 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
reg = readl_relaxed(priv->sensor);
reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
- *temp = (3153000000UL - (10000000UL*reg)) / 13825;
+
+ /* Get formula coeficients */
+ b = priv->data->coef_b;
+ m = priv->data->coef_m;
+ div = priv->data->coef_div;
+
+ *temp = (b - (m * reg)) / div;
return 0;
}
@@ -131,11 +143,17 @@ static struct thermal_zone_device_ops ops = {
static const struct armada_thermal_data armadaxp_data = {
.init_sensor = armadaxp_init_sensor,
+ .coef_b = 3153000000UL,
+ .coef_m = 10000000UL,
+ .coef_div = 13825,
};
static const struct armada_thermal_data armada370_data = {
.is_valid = armada_is_valid,
.init_sensor = armada370_init_sensor,
+ .coef_b = 3153000000UL,
+ .coef_m = 10000000UL,
+ .coef_div = 13825,
};
static const struct of_device_id armada_thermal_id_table[] = {
--
1.9.1
--
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