Current driver assume PWR_AVG and VI_AVG as 1 by default, and user needs
to set sample averaging via sysfs manually.
This patch parses the properties below from device tree, and setting
sample averaging during probe. Allowed input value from 1 to 128. If the
inputed value is not power of 2, the sample averaging number will be
configured with the smaller and cloest power of 2.
- adi,power-sample-average
- adi,volt-curr-sample-average
Signed-off-by: Potin Lai <potin.lai@xxxxxxxxxxxx>
---
drivers/hwmon/pmbus/adm1275.c | 36 +++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index d311e0557401..212c7f3c59b0 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -475,6 +475,7 @@ static int adm1275_probe(struct i2c_client *client)
int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
int tindex = -1;
u32 shunt;
+ u32 avg;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
@@ -756,6 +757,41 @@ static int adm1275_probe(struct i2c_client *client)
return -ENODEV;
}
+ if (data->have_power_sampling &&
+ of_property_read_u32(client->dev.of_node,
+ "adi,power-sample-average", &avg) == 0) {
+ if (avg > ADM1275_SAMPLES_AVG_MAX || avg < 1)
+ return -EINVAL;
+ dev_info(&client->dev,
+ "Setting power sample averaging number to %u",
+ BIT(ilog2(avg)));
+ ret = adm1275_write_pmon_config(data, client, true,
+ ilog2(avg));
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Setting power sample averaging failed with error %d",
+ ret);
+ return ret;
+ }
+ }
+
+ if (of_property_read_u32(client->dev.of_node,
+ "adi,volt-curr-sample-average", &avg) == 0) {
+ if (avg > ADM1275_SAMPLES_AVG_MAX || avg < 1)
+ return -EINVAL;
+ dev_info(&client->dev,
+ "Setting voltage and current sample averaging number to %u",
+ BIT(ilog2(avg)));
+ ret = adm1275_write_pmon_config(data, client, false,
+ ilog2(avg));
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Setting voltage and current sample averaging failed with error %d",
+ ret);
+ return ret;
+ }
+ }
+
if (voindex < 0)
voindex = vindex;
if (vindex >= 0) {
--
2.17.1
