Modify the equation and coefficients to convert the digital output to temperature according to series 5 of the Moortec Embedded Temperature Sensor (METS) datasheet: T = G + H * (n / cal5 - 0.5) + J * F The G, H and J coefficients are multiplied by 1000 to get the temperature in milli-Celsius. Signed-off-by: Eliav Farber <farbere@xxxxxxxxxx> --- drivers/hwmon/mr75203.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c index 8d8883301ff5..59e2dc8fa333 100644 --- a/drivers/hwmon/mr75203.c +++ b/drivers/hwmon/mr75203.c @@ -100,9 +100,10 @@ #define PVT_POLL_DELAY_US 20 #define PVT_POLL_TIMEOUT_US 20000 -#define PVT_H_CONST 100000 -#define PVT_CAL5_CONST 2047 -#define PVT_G_CONST 40000 +#define PVT_H_CONST 60000 +#define PVT_G_CONST 200000 +#define PVT_J_CONST -100 +#define PVT_CAL5_CONST 4094 #define PVT_CONV_BITS 10 #define PVT_N_CONST 90 #define PVT_R_CONST 245805 @@ -156,7 +157,6 @@ static int pvt_read_temp(struct device *dev, u32 attr, int channel, long *val) struct regmap *t_map = pvt->t_map; u32 stat, nbs; int ret; - u64 tmp; switch (attr) { case hwmon_temp_input: @@ -174,12 +174,13 @@ static int pvt_read_temp(struct device *dev, u32 attr, int channel, long *val) nbs &= SAMPLE_DATA_MSK; /* - * Convert the register value to - * degrees centigrade temperature + * Convert the register value to degrees centigrade temperature: + * T = G + H * (n / cal5 - 0.5) + J * F */ - tmp = nbs * PVT_H_CONST; - do_div(tmp, PVT_CAL5_CONST); - *val = tmp - PVT_G_CONST - pvt->ip_freq; + *val = PVT_G_CONST; + *val += PVT_H_CONST * nbs / PVT_CAL5_CONST; + *val -= PVT_H_CONST / 2; + *val += PVT_J_CONST * pvt->ip_freq / HZ_PER_MHZ; return 0; default: @@ -311,7 +312,7 @@ static int pvt_init(struct pvt_device *pvt) (key >> 1) << CLK_SYNTH_HI_SFT | (key >> 1) << CLK_SYNTH_HOLD_SFT | CLK_SYNTH_EN; - pvt->ip_freq = sys_freq * 100 / (key + 2); + pvt->ip_freq = clk_get_rate(pvt->clk) / (key + 2); if (t_num) { ret = regmap_write(t_map, SDIF_SMPL_CTRL, 0x0); -- 2.37.1