hwmon: (mr75203) parse temperature coefficients from device-tree

Use thermal coefficients from the device tree if they exist.
Otherwise, use default values according to the series (5 or 6).
All coefficients can be used or only part of them.

The coefficients shall be used for fine tuning the default values since
coefficients can vary between product and product.

Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220908152449.35457-20-farbere@amazon.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index ce00349..e3960fc 100644 (file)
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -709,6 +709,15 @@ static int pvt_set_temp_coeff(struct device *dev, struct pvt_device *pvt)
 
        dev_dbg(dev, "temperature sensor series = %u\n", series);
 
+       /* Override ts-coeff-h/g/j/cal5 if they are defined. */
+       device_property_read_u32(dev, "moortec,ts-coeff-h", &ts_coeff->h);
+       device_property_read_u32(dev, "moortec,ts-coeff-g", &ts_coeff->g);
+       device_property_read_u32(dev, "moortec,ts-coeff-j", &ts_coeff->j);
+       device_property_read_u32(dev, "moortec,ts-coeff-cal5", &ts_coeff->cal5);
+
+       dev_dbg(dev, "ts-coeff: h = %u, g = %u, j = %d, cal5 = %u\n",
+               ts_coeff->h, ts_coeff->g, ts_coeff->j, ts_coeff->cal5);
+
        return 0;
 }