* [PATCH v6 1/2] hwmon: (mr75203) modify the temperature equation according to series 5 datasheet
2022-09-21 12:18 [PATCH v6 0/2] Variety of fixes and new features for mr75203 driver Eliav Farber
@ 2022-09-21 12:18 ` Eliav Farber
2022-09-21 13:02 ` Sudip Mukherjee
2022-09-21 12:18 ` [PATCH v6 2/2] hwmon: (mr75203) add support for series 6 temperature equation Eliav Farber
1 sibling, 1 reply; 5+ messages in thread
From: Eliav Farber @ 2022-09-21 12:18 UTC (permalink / raw)
To: jdelvare, linux, linux-hwmon, linux-kernel, andriy.shevchenko,
sudipm.mukherjee
Cc: farbere, hhhawa, jonnyc, Andy Shevchenko, kernel test robot
Modify the equation and coefficients used 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
Where:
*) G = 60, H = 200, cal5 = 4094, J = -0.1.
*) F = frequency clock in MHz.
*) n is the digital output.
In code, the G, H and J coefficients are multiplied by a factor of 1000
to get the temperature in milli-Celsius.
Final result is clamped in case it exceeds min/max thresholds.
Change is done since it is unclear where the current equation and
coefficients came from.
Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
---
V5 -> V4:
- fix undefined reference to `__divdi3'
V4 -> V3:
- Change 'not clear' to 'unclear' in commit message.
- Add _mC prefix to temperature mix/max defines.
- Add SERIES5 to coefficient defines.
V3 -> V2:
- Protect from overflow.
- Add temperature clamping.
- Add better documentation.
drivers/hwmon/mr75203.c | 33 +++++++++++++++++++++++++--------
1 file changed, 25 insertions(+), 8 deletions(-)
diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index 8a6ae72fed20..fb262fd2b511 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -102,13 +102,19 @@
#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_CONV_BITS 10
#define PVT_N_CONST 90
#define PVT_R_CONST 245805
+#define PVT_TEMP_MIN_mC -40000
+#define PVT_TEMP_MAX_mC 125000
+
+/* Temperature coefficients for series 5 */
+#define PVT_SERIES5_H_CONST 200000
+#define PVT_SERIES5_G_CONST 60000
+#define PVT_SERIES5_J_CONST -100
+#define PVT_SERIES5_CAL5_CONST 4094
+
#define PRE_SCALER_X1 1
#define PRE_SCALER_X2 2
@@ -174,13 +180,26 @@ static umode_t pvt_is_visible(const void *data, enum hwmon_sensor_types type,
return 0;
}
+static long pvt_calc_temp(struct pvt_device *pvt, u32 nbs)
+{
+ /*
+ * Convert the register value to degrees centigrade temperature:
+ * T = G + H * (n / cal5 - 0.5) + J * F
+ */
+ s64 tmp = PVT_SERIES5_G_CONST +
+ div_s64(PVT_SERIES5_H_CONST * (s64)nbs, PVT_SERIES5_CAL5_CONST) -
+ PVT_SERIES5_H_CONST / 2 +
+ div_s64(PVT_SERIES5_J_CONST * (s64)pvt->ip_freq, HZ_PER_MHZ);
+
+ return clamp_val(tmp, PVT_TEMP_MIN_mC, PVT_TEMP_MAX_mC);
+}
+
static int pvt_read_temp(struct device *dev, u32 attr, int channel, long *val)
{
struct pvt_device *pvt = dev_get_drvdata(dev);
struct regmap *t_map = pvt->t_map;
u32 stat, nbs;
int ret;
- u64 tmp;
switch (attr) {
case hwmon_temp_input:
@@ -201,9 +220,7 @@ static int pvt_read_temp(struct device *dev, u32 attr, int channel, long *val)
* Convert the register value to
* degrees centigrade temperature
*/
- tmp = nbs * PVT_H_CONST;
- do_div(tmp, PVT_CAL5_CONST);
- *val = tmp - PVT_G_CONST - pvt->ip_freq;
+ *val = pvt_calc_temp(pvt, nbs);
return 0;
default:
@@ -337,7 +354,7 @@ 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
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v6 2/2] hwmon: (mr75203) add support for series 6 temperature equation
2022-09-21 12:18 [PATCH v6 0/2] Variety of fixes and new features for mr75203 driver Eliav Farber
2022-09-21 12:18 ` [PATCH v6 1/2] hwmon: (mr75203) modify the temperature equation according to series 5 datasheet Eliav Farber
@ 2022-09-21 12:18 ` Eliav Farber
2022-09-21 13:03 ` Sudip Mukherjee
1 sibling, 1 reply; 5+ messages in thread
From: Eliav Farber @ 2022-09-21 12:18 UTC (permalink / raw)
To: jdelvare, linux, linux-hwmon, linux-kernel, andriy.shevchenko,
sudipm.mukherjee
Cc: farbere, hhhawa, jonnyc, Andy Shevchenko, kernel test robot
The current equation used in code is aligned to series 5:
T = G + H * (n / cal5 - 0.5) + J * F
Where:
G = 60, H = 200, cal5 = 4094, J = -0.1, F = frequency clock in MHz
Series 6 has a slightly different equation:
T = G + H * (n / cal5 - 0.5)
and a different set of coefficients:
G = 57.4, H = 249.4, cal5 = 4096
This change supports equation and coefficients for both series.
(for series 6, J is set to 0).
The series is determined according to “moortec,ts-series” property in
the device tree.
If absent, series 5 is assumed to be the default.
Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
---
V5 -> V4:
- fix undefined reference to `__divdi3'
V4 -> V3:
- Replace of_property_read_u32() with device_property_read_u32().
- Use switch-case instead of if-else.
V3 -> V2:
- New patch to support temperature sensor series 6 instead of having to
set all 4 coefficients.
drivers/hwmon/mr75203.c | 66 ++++++++++++++++++++++++++++++++++++++---
1 file changed, 62 insertions(+), 4 deletions(-)
diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index fb262fd2b511..f17050e11328 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -115,6 +115,15 @@
#define PVT_SERIES5_J_CONST -100
#define PVT_SERIES5_CAL5_CONST 4094
+/* Temperature coefficients for series 6 */
+#define PVT_SERIES6_H_CONST 249400
+#define PVT_SERIES6_G_CONST 57400
+#define PVT_SERIES6_J_CONST 0
+#define PVT_SERIES6_CAL5_CONST 4096
+
+#define TEMPERATURE_SENSOR_SERIES_5 5
+#define TEMPERATURE_SENSOR_SERIES_6 6
+
#define PRE_SCALER_X1 1
#define PRE_SCALER_X2 2
@@ -147,6 +156,13 @@ struct voltage_channels {
u8 max;
};
+struct temp_coeff {
+ u32 h;
+ u32 g;
+ u32 cal5;
+ s32 j;
+};
+
struct pvt_device {
struct regmap *c_map;
struct regmap *t_map;
@@ -156,6 +172,7 @@ struct pvt_device {
struct reset_control *rst;
struct voltage_device *vd;
struct voltage_channels vm_channels;
+ struct temp_coeff ts_coeff;
u32 t_num;
u32 p_num;
u32 v_num;
@@ -186,10 +203,12 @@ static long pvt_calc_temp(struct pvt_device *pvt, u32 nbs)
* Convert the register value to degrees centigrade temperature:
* T = G + H * (n / cal5 - 0.5) + J * F
*/
- s64 tmp = PVT_SERIES5_G_CONST +
- div_s64(PVT_SERIES5_H_CONST * (s64)nbs, PVT_SERIES5_CAL5_CONST) -
- PVT_SERIES5_H_CONST / 2 +
- div_s64(PVT_SERIES5_J_CONST * (s64)pvt->ip_freq, HZ_PER_MHZ);
+ struct temp_coeff *ts_coeff = &pvt->ts_coeff;
+
+ s64 tmp = ts_coeff->g +
+ div_s64(ts_coeff->h * (s64)nbs, ts_coeff->cal5) -
+ ts_coeff->h / 2 +
+ div_s64(ts_coeff->j * (s64)pvt->ip_freq, HZ_PER_MHZ);
return clamp_val(tmp, PVT_TEMP_MIN_mC, PVT_TEMP_MAX_mC);
}
@@ -668,6 +687,41 @@ static int pvt_get_pre_scaler(struct device *dev, struct pvt_device *pvt)
return ret;
}
+static int pvt_set_temp_coeff(struct device *dev, struct pvt_device *pvt)
+{
+ struct temp_coeff *ts_coeff = &pvt->ts_coeff;
+ u32 series;
+ int ret;
+
+ /* Incase ts-series property is not defined, use default 5. */
+ ret = device_property_read_u32(dev, "moortec,ts-series", &series);
+ if (ret)
+ series = TEMPERATURE_SENSOR_SERIES_5;
+
+ switch (series) {
+ case TEMPERATURE_SENSOR_SERIES_5:
+ ts_coeff->h = PVT_SERIES5_H_CONST;
+ ts_coeff->g = PVT_SERIES5_G_CONST;
+ ts_coeff->j = PVT_SERIES5_J_CONST;
+ ts_coeff->cal5 = PVT_SERIES5_CAL5_CONST;
+ break;
+ case TEMPERATURE_SENSOR_SERIES_6:
+ ts_coeff->h = PVT_SERIES6_H_CONST;
+ ts_coeff->g = PVT_SERIES6_G_CONST;
+ ts_coeff->j = PVT_SERIES6_J_CONST;
+ ts_coeff->cal5 = PVT_SERIES6_CAL5_CONST;
+ break;
+ default:
+ dev_err(dev, "invalid temperature sensor series (%u)\n",
+ series);
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "temperature sensor series = %u\n", series);
+
+ return 0;
+}
+
static int mr75203_probe(struct platform_device *pdev)
{
u32 ts_num, vm_num, pd_num, ch_num, val, index, i;
@@ -738,6 +792,10 @@ static int mr75203_probe(struct platform_device *pdev)
if (ret)
return ret;
+ ret = pvt_set_temp_coeff(dev, pvt);
+ if (ret)
+ return ret;
+
temp_config = devm_kcalloc(dev, ts_num + 1,
sizeof(*temp_config), GFP_KERNEL);
if (!temp_config)
--
2.37.1
^ permalink raw reply related [flat|nested] 5+ messages in thread