| Qualcomm Technologies, Inc. TADC Specific Bindings |
| |
| TADC (Telemetry ADC) is a 10 bit resolution ADC which has 8 channels: battery |
| temperature, skin temperature, die temperature, battery current, battery |
| voltage, input current, input voltage, and OTG current. |
| |
| ======================= |
| Required Node Structure |
| ======================= |
| |
| A TADC must be described in two levels of devices nodes. |
| |
| ======================= |
| First Level Node - TADC |
| ======================= |
| |
| - reg |
| Usage: required |
| Value type: <prop-encoded-array> |
| Definition: Address and size of the TADC register block. |
| |
| TADC specific properties: |
| - compatible |
| Usage: required |
| Value type: <string> |
| Definition: Must be "qcom,tadc". |
| |
| - interrupts |
| Usage: required |
| Value type: <prop-encoded-array> |
| Definition: Peripheral interrupt specifier. |
| |
| - interrupt-names |
| Usage: required |
| Value type: <stringlist> |
| Definition: Interrupt names. This list must match up 1-to-1 with the |
| interrupts specified in the 'interrupts' property. |
| |
| ============================================= |
| Second Level Nodes - TADC Thermistor Channels |
| ============================================= |
| |
| - reg |
| Usage: required |
| Value type: <u32> |
| Definition: The 0 based channel number. |
| |
| TADC thermistor channel specific properties: |
| - qcom,rbias |
| Usage: required |
| Value type: <u32> |
| Definition: The bias resistor value. |
| |
| - qcom,therm-at-25degc |
| Usage: required |
| Value type: <u32> |
| Definition: The thermistor resistance at 25 DegC. |
| |
| - qcom,beta-coefficient |
| Usage: required |
| Value type: <u32> |
| Definition: The beta coefficeent or B-parameter of the thermistor. |
| |
| =============================================== |
| Second Level Nodes - TADC Scale/Offset Channels |
| =============================================== |
| |
| - reg |
| Usage: required |
| Value type: <u32> |
| Definition: The 0 based channel number. |
| |
| TADC scale/offset channel specific properties: |
| - qcom,scale |
| Usage: required |
| Value type: <s32> |
| Definition: The RAW scaling factor. |
| |
| - qcom,offset |
| Usage: optional |
| Value type: <s32> |
| Definition: The offset after scaling. |
| |
| ======= |
| Example |
| ======= |
| |
| smb138x_tadc: qcom,tadc@3600 { |
| compatible = "qcom,tadc"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| #io-channel-cells = <1>; |
| interrupts = <0x36 0x0 IRQ_TYPE_EDGE_BOTH>; |
| interrupt-names = "eoc"; |
| |
| batt_temp@0 { |
| reg = <0>; |
| qcom,rbias = <68100>; |
| qcom,rtherm-at-25degc = <68000>; |
| qcom,beta-coefficient = <3450>; |
| }; |
| |
| skin_temp@1 { |
| reg = <1>; |
| qcom,rbias = <33000>; |
| qcom,rtherm-at-25degc = <68000>; |
| qcom,beta-coefficient = <3450>; |
| }; |
| |
| die_temp@2 { |
| reg = <2>; |
| qcom,scale = <(-1032)>; |
| qcom,offset = <344125>; |
| }; |
| |
| batt_i@3 { |
| reg = <3>; |
| qcom,channel = <3>; |
| qcom,scale = <20000000>; |
| }; |
| |
| batt_v@4 { |
| reg = <4>; |
| qcom,scale = <5000000>; |
| }; |
| |
| input_i@5 { |
| reg = <5>; |
| qcom,scale = <14285714>; |
| }; |
| |
| input_v@6 { |
| reg = <6>; |
| qcom,scale = <25000000>; |
| }; |
| |
| otg_i@7 { |
| reg = <7>; |
| qcom,scale = <5714286>; |
| }; |
| }; |