List of fixes:
- Fix "intel,vm-map" property to be optional.
- Fix VM sensor allocation when "intel,vm-map" not defined.
- Fix multi-channel voltage reading.
- Fix voltage equation for negative source input.
- Modify the temperature equation according to series 5 datasheet.
- Fix coding style issue.
List of new features:
- Modify "reset" property to be optional.
- Add optional "moortec,vm-active-channels" property to define the number
of active channels per VM.
- Add support for mr76006 pre-scaler to multiply the voltage result by 2.
- Add support for series 6 temperature equation.
- Add coefficient properties to fine tune the temperature equation.
- Add debugfs to read and write temperature coefficients
---------
Changes between v5 and v6:
- fix undefined reference to `__divdi3' for 32-bit machines.
!!! Note: The patches of this series were pushed to hwmon-next and then
I got an automatic reply saying that these patches failed on some builds.
I sent separately an incremental patch which fixes the problem, and in
addition these two "replacement" patches for you do choose the option
you prefer. !!!
Changes between v4 and v5:
- 0004: Add detailed comment in code explaining the cast and the div instead of
right shift or use of BIT().
- 0011: Fix typo in description (nou --> not).
- 0020: Return j coefficient to use debugfs_create_file() instead of
debugfs_create_u32() because j is signed.
- 0021: Move the coding style patch to be last in the series (it does not fix
the code), and remove the "Fixes:" tag.
Changes between v3 and v4:
*) Provide a Fixes tag for all fixes in the series.
*) Start series with fixes.
*) New patch to add description in moortec,mr75203.yaml.
*) New patch to add moortec to vendor-prefixes.
*) Fix moortec,mr75203.yaml checker errors.
*) Remove validation of device-tree parameters.
*) Fix per patch specific comments (detailed in each patch).
Changes between v2 and v3:
*) Add "moortec" prefix to all new device-tree properties.
*) Change order of patches.
*) Add explanations to better understand the changes.
*) Change "reset" property to be optional and remove the
"reset-control-skip" property.
*) Split the patch for "fix multi-channel voltage reading" to two
patches.
*) Change pre-scaler property format and fix typo (scalar --> scaler).
*) Fix voltage equation to support negative values instead of limiting
value to zero.
*) Temperature equation - protect from overflow and add clamping.
*) Add new "moortec,ts-series" property to select between temperature
equation of series 5 or series 6.
Changes between v1 and v2:
*) Fix compilation error for patch 08/16:
"warning: ISO C90 forbids variable length array"
---------
Eliav Farber (2):
hwmon: (mr75203) modify the temperature equation according to series 5
datasheet
hwmon: (mr75203) add support for series 6 temperature equation
drivers/hwmon/mr75203.c | 91 +++++++++++++++++++++++++++++++++++++----
1 file changed, 83 insertions(+), 8 deletions(-)
--
2.37.1
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 <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reported-by: kernel test robot <[email protected]>
---
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
On Wed, Sep 21, 2022 at 1:18 PM Eliav Farber <[email protected]> wrote:
>
> 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 <[email protected]>
> Reviewed-by: Andy Shevchenko <[email protected]>
> Reported-by: kernel test robot <[email protected]>
Only build tested on top of next-20220921 after reverting v5 patches.
Tested-by: Sudip Mukherjee <[email protected]>
--
Regards
Sudip