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thermal: armada: Add infrastructure to support generic formulas

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In order to support other similar SoC, with different sensor
coefficients, this commit adds the coeficients to the per-variant
structure, instead of having the formula hardcoded.

Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Ezequiel Garcia 2014-05-06 13:59:46 -03:00 committed by Zhang Rui
parent 66fdb7b635
commit 9484bc62ca
1 changed files with 19 additions and 1 deletions
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20
drivers/thermal/armada_thermal.c
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@ -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[] = {