From: Opensource [Steve Twiss] <stwiss.opensource@xxxxxxxxxxx> Addition of HWMON documentation for the DA9063 driver. Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@xxxxxxxxxxx> --- Checks performed with linux-next/next-20140321/scripts/checkpatch.pl da9063 total: 0 errors, 0 warnings, 67 lines checked This is the documentation that goes along with the DA9063 HWMON driver and the associated changes to the DA9063 mfd core and platform data. Dependencies: - The two other patches in this patch set: These are the HWMON driver and the MFD core changes This patch applies against linux-next and next-20140321 Regards, Steve Twiss, Dialog Semiconductor Ltd. Documentation/hwmon/da9063 | 67 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 Documentation/hwmon/da9063 diff --git a/Documentation/hwmon/da9063 b/Documentation/hwmon/da9063 new file mode 100644 index 0000000..fa616bb --- /dev/null +++ b/Documentation/hwmon/da9063 @@ -0,0 +1,67 @@ + +Kernel driver da9063-hwmon +========================== + +Supported chips: + * Dialog Semiconductor DA9063 PMIC + Prefix: 'da9063' + Datasheet: + http://www.dialog-semiconductor.com/products/power-management/DA9063 + +Authors: S Twiss <stwiss.opensource@xxxxxxxxxxx> + +Description +----------- + +The DA9063 PMIC provides a general purpose ADC with 10 bits of resolution. +It uses track and hold circuitry with an analogue input multiplexer which +allows the conversion of up to 9 different inputs. + + Channel 0: VSYS_RES measurement of the system VDD (2.5 - 5.5V) + Channel 1: ADCIN1_RES high impedance input (0 - 2.5V) + Channel 2: ADCIN2_RES high impedance input (0 - 2.5V) + Channel 3: ADCIN3_RES high impedance input (0 - 2.5V) + Channel 4: Tjunc measurement of internal temperature sensor + Channel 5: VBBAT measurement of the backup battery voltage (0 - 5.0V) + Channel 6: N/A Reserved + Channel 7: N/A Reserved + Channel 8: MON1_RES group 1 internal regulators voltage (0 - 5.0V) + Channel 9: MON2_RES group 2 internal regulators voltage (0 - 5.0V) + Channel 10: MON3_RES group 3 internal regulators voltage (0 - 5.0V) + +The MUX selects from and isolates the 9 inputs and presents the channel to +be measured to the ADC input. When selected, an input amplifier on the VSYS +channel subtracts the VDDCORE reference voltage and scales the signal to the +correct value for the ADC. + +The analog ADC includes current sources at ADC_IN1, ADC_IN2 and ADC_IN3 to +support resistive measurements. + +Channels 1, 2 and 3 current source capability can be set through the ADC +thresholds ADC_CFG register and values for ADCIN1_CUR, ADCIN2_CUR and +ADCIN3_CUR. Settings for ADCIN1_CUR and ADCIN2_CUR are 1.0, 2.0, 10 and +40 micro Amps. The setting for ADCIN3_CUR is 10 micro Amps. + +Voltage Monitoring +------------------ + +The manual measurement allows monitoring of the system voltage VSYS, the +auxiliary channels ADCIN1, ADCIN2 and ADCIN3, and a VBBAT measurement of +the backup battery voltage (0 - 5.0V). The manual measurements store 10 +bits of ADC resolution. + +The manual ADC measurements attributes described above are supported by +the driver. + +The automatic ADC measurement is not supported by the driver. + +Temperature Monitoring +---------------------- + +Channel 4 (Tjunc) will be used to measure the output of the internal +temperature sensor. The ADC measurement result and the T_OFFSET value can +be used by the host to calculate the internal junction temperature + + Tjunc = -0.41 * (ADC - T_OFFSET - 812.5); + +The junction temperature attribute is supported by the driver. -- end-of-patch for RFC V1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
