From: "Opensource [Steve Twiss]" <stwiss.opensource@xxxxxxxxxxx> Addition of HWMON documentation for the DA9063 driver. Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@xxxxxxxxxxx> Updated temperature formula, as of datasheet rev 2.3. Converted to ReStructuredText. Signed-off-by: Vincent Pelletier <plr.vincent@xxxxxxxxx> --- Changes in v2: - ReST-ified Originally submitted by Steve Twiss in 2014: https://marc.info/?l=linux-kernel&m=139560868209856&w=2 Documentation/hwmon/da9063.rst | 73 ++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/hwmon/da9063.rst diff --git a/Documentation/hwmon/da9063.rst b/Documentation/hwmon/da9063.rst new file mode 100644 index 000000000000..aae69c58a5d6 --- /dev/null +++ b/Documentation/hwmon/da9063.rst @@ -0,0 +1,73 @@ +Kernel driver da9063-hwmon +========================== + +Supported chips: + + * Dialog Semiconductor DA9063 PMIC + + Prefix: 'da9063' + + Datasheet: Publicly available at the Dialog Semiconductor website: + + http://www.dialog-semiconductor.com/products/power-management/DA9063 + +Authors: + - S Twiss <stwiss.opensource@xxxxxxxxxxx> + - Vincent Pelletier <plr.vincent@xxxxxxxxx> + +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 +---------------------- + +Temperatures are sampled by a 10 bit ADC. Junction temperatures +are monitored by the ADC channels. + +The junction temperature is calculated: + + Degrees celsius = -0.398 * (ADC_RES - T_OFFSET) + 330; + +The junction temperature attribute is supported by the driver. -- 2.32.0
