| Qualcomm Technologies Inc., PMIC Round Robin ADC (RRADC) |
| |
| PMIC RRADC provides an interface to the clients to read |
| the voltage, current and temperature for supported channels |
| such as battery ID, battery thermistor, die temperature, |
| charger temperature, USB_IN and DC_IN voltage and current. |
| |
| Main node properties: |
| |
| - compatible: |
| Usage: required |
| Value type: <string> |
| Definition: Should contain "qcom,rradc". |
| |
| - reg: |
| Usage: required |
| Value type: <prop-encoded-array> |
| Definition: RRADC base address and length in the PMIC register map. |
| |
| - #address-cells: |
| Usage: required |
| Value type: <u32> |
| Definition: Must be one. Child node 'channel' property should define ADC |
| channel number. For details about IIO bindings see: |
| Documentation/devicetree/bindings/iio/iio-bindings.txt |
| |
| - #size-cells: |
| Usage: required |
| Value type: <u32> |
| Definition: Must be zero. For details about IIO bindings see: |
| Documentation/devicetree/bindings/iio/iio-bindings.txt |
| |
| - #io-channel-cells: |
| Usage: required |
| Value type: <u32> |
| Definition: Must be one. For details about IIO bindings see: |
| Documentation/devicetree/bindings/iio/iio-bindings.txt |
| |
| IIO client nodes need to specify the RRADC channel number while requesting ADC reads. |
| The channel list supported by the RRADC driver is available in the enum rradc_channel_id |
| located at at drivers/iio/adc/qcom-rradc.c. Clients can use this index from the enum |
| as the channel number while requesting ADC reads. |
| |
| Optional property: |
| - qcom,pmic-revid : Phandle pointing to the revision peripheral node. Use it to query the |
| PMIC fabrication ID for applying the appropriate temperature |
| compensation parameters. |
| Example: |
| |
| /* RRADC node */ |
| pmic_rradc: rradc@4500 { |
| compatible = "qcom,rradc"; |
| reg = <0x4500 0x100>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| #io-channel-cells = <1>; |
| }; |
| |
| /* IIO client node */ |
| charger { |
| io-channels = <&pmic_rradc 0>; |
| io-channel-names = "rradc_batt_id"; |
| }; |