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Diffstat (limited to 'Documentation/devicetree/bindings/mfd/qcom-rpm.txt')
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diff --git a/Documentation/devicetree/bindings/mfd/qcom-rpm.txt b/Documentation/devicetree/bindings/mfd/qcom-rpm.txt new file mode 100644 index 000000000..5e97a9593 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/qcom-rpm.txt @@ -0,0 +1,264 @@ +Qualcomm Resource Power Manager (RPM) + +This driver is used to interface with the Resource Power Manager (RPM) found in +various Qualcomm platforms. The RPM allows each component in the system to vote +for state of the system resources, such as clocks, regulators and bus +frequencies. + +- compatible: + Usage: required + Value type: <string> + Definition: must be one of: + "qcom,rpm-apq8064" + "qcom,rpm-msm8660" + "qcom,rpm-msm8960" + "qcom,rpm-ipq8064" + +- reg: + Usage: required + Value type: <prop-encoded-array> + Definition: base address and size of the RPM's message ram + +- interrupts: + Usage: required + Value type: <prop-encoded-array> + Definition: three entries specifying the RPM's: + 1. acknowledgement interrupt + 2. error interrupt + 3. wakeup interrupt + +- interrupt-names: + Usage: required + Value type: <string-array> + Definition: must be the three strings "ack", "err" and "wakeup", in order + +- qcom,ipc: + Usage: required + Value type: <prop-encoded-array> + + Definition: three entries specifying the outgoing ipc bit used for + signaling the RPM: + - phandle to a syscon node representing the apcs registers + - u32 representing offset to the register within the syscon + - u32 representing the ipc bit within the register + + += SUBNODES + +The RPM exposes resources to its subnodes. The below bindings specify the set +of valid subnodes that can operate on these resources. + +== Regulators + +Regulator nodes are identified by their compatible: + +- compatible: + Usage: required + Value type: <string> + Definition: must be one of: + "qcom,rpm-pm8058-regulators" + "qcom,rpm-pm8901-regulators" + "qcom,rpm-pm8921-regulators" + +- vdd_l0_l1_lvs-supply: +- vdd_l2_l11_l12-supply: +- vdd_l3_l4_l5-supply: +- vdd_l6_l7-supply: +- vdd_l8-supply: +- vdd_l9-supply: +- vdd_l10-supply: +- vdd_l13_l16-supply: +- vdd_l14_l15-supply: +- vdd_l17_l18-supply: +- vdd_l19_l20-supply: +- vdd_l21-supply: +- vdd_l22-supply: +- vdd_l23_l24_l25-supply: +- vdd_ncp-supply: +- vdd_s0-supply: +- vdd_s1-supply: +- vdd_s2-supply: +- vdd_s3-supply: +- vdd_s4-supply: + Usage: optional (pm8058 only) + Value type: <phandle> + Definition: reference to regulator supplying the input pin, as + described in the data sheet + +- lvs0_in-supply: +- lvs1_in-supply: +- lvs2_in-supply: +- lvs3_in-supply: +- mvs_in-supply: +- vdd_l0-supply: +- vdd_l1-supply: +- vdd_l2-supply: +- vdd_l3-supply: +- vdd_l4-supply: +- vdd_l5-supply: +- vdd_l6-supply: +- vdd_s0-supply: +- vdd_s1-supply: +- vdd_s2-supply: +- vdd_s3-supply: +- vdd_s4-supply: + Usage: optional (pm8901 only) + Value type: <phandle> + Definition: reference to regulator supplying the input pin, as + described in the data sheet + +- vdd_l1_l2_l12_l18-supply: +- vdd_l3_l15_l17-supply: +- vdd_l4_l14-supply: +- vdd_l5_l8_l16-supply: +- vdd_l6_l7-supply: +- vdd_l9_l11-supply: +- vdd_l10_l22-supply: +- vdd_l21_l23_l29-supply: +- vdd_l24-supply: +- vdd_l25-supply: +- vdd_l26-supply: +- vdd_l27-supply: +- vdd_l28-supply: +- vdd_ncp-supply: +- vdd_s1-supply: +- vdd_s2-supply: +- vdd_s4-supply: +- vdd_s5-supply: +- vdd_s6-supply: +- vdd_s7-supply: +- vdd_s8-supply: +- vin_5vs-supply: +- vin_lvs1_3_6-supply: +- vin_lvs2-supply: +- vin_lvs4_5_7-supply: + Usage: optional (pm8921 only) + Value type: <phandle> + Definition: reference to regulator supplying the input pin, as + described in the data sheet + +The regulator node houses sub-nodes for each regulator within the device. Each +sub-node is identified using the node's name, with valid values listed for each +of the pmics below. + +pm8058: + l0, l1, l2, l3, l4, l5, l6, l7, l8, l9, l10, l11, l12, l13, l14, l15, + l16, l17, l18, l19, l20, l21, l22, l23, l24, l25, s0, s1, s2, s3, s4, + lvs0, lvs1, ncp + +pm8901: + l0, l1, l2, l3, l4, l5, l6, s0, s1, s2, s3, s4, lvs0, lvs1, lvs2, lvs3, + mvs + +pm8921: + s1, s2, s3, s4, s7, s8, l1, l2, l3, l4, l5, l6, l7, l8, l9, l10, l11, + l12, l14, l15, l16, l17, l18, l21, l22, l23, l24, l25, l26, l27, l28, + l29, lvs1, lvs2, lvs3, lvs4, lvs5, lvs6, lvs7, usb-switch, hdmi-switch, + ncp + +The content of each sub-node is defined by the standard binding for regulators - +see regulator.txt - with additional custom properties described below: + +=== Switch-mode Power Supply regulator custom properties + +- bias-pull-down: + Usage: optional + Value type: <empty> + Definition: enable pull down of the regulator when inactive + +- qcom,switch-mode-frequency: + Usage: required + Value type: <u32> + Definition: Frequency (Hz) of the switch-mode power supply; + must be one of: + 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, + 2740000, 2400000, 2130000, 1920000, 1750000, 1600000, + 1480000, 1370000, 1280000, 1200000 + +- qcom,force-mode: + Usage: optional (default if no other qcom,force-mode is specified) + Value type: <u32> + Defintion: indicates that the regulator should be forced to a + particular mode, valid values are: + QCOM_RPM_FORCE_MODE_NONE - do not force any mode + QCOM_RPM_FORCE_MODE_LPM - force into low power mode + QCOM_RPM_FORCE_MODE_HPM - force into high power mode + QCOM_RPM_FORCE_MODE_AUTO - allow regulator to automatically + select its own mode based on + realtime current draw, only for: + pm8921 smps and ftsmps + +- qcom,power-mode-hysteretic: + Usage: optional + Value type: <empty> + Definition: select that the power supply should operate in hysteretic + mode, instead of the default pwm mode + +=== Low-dropout regulator custom properties + +- bias-pull-down: + Usage: optional + Value type: <empty> + Definition: enable pull down of the regulator when inactive + +- qcom,force-mode: + Usage: optional + Value type: <u32> + Defintion: indicates that the regulator should not be forced to any + particular mode, valid values are: + QCOM_RPM_FORCE_MODE_NONE - do not force any mode + QCOM_RPM_FORCE_MODE_LPM - force into low power mode + QCOM_RPM_FORCE_MODE_HPM - force into high power mode + QCOM_RPM_FORCE_MODE_BYPASS - set regulator to use bypass + mode, i.e. to act as a switch + and not regulate, only for: + pm8921 pldo, nldo and nldo1200 + +=== Negative Charge Pump custom properties + +- qcom,switch-mode-frequency: + Usage: required + Value type: <u32> + Definition: Frequency (Hz) of the swith mode power supply; + must be one of: + 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, + 2740000, 2400000, 2130000, 1920000, 1750000, 1600000, + 1480000, 1370000, 1280000, 1200000 + += EXAMPLE + + #include <dt-bindings/mfd/qcom-rpm.h> + + rpm@108000 { + compatible = "qcom,rpm-msm8960"; + reg = <0x108000 0x1000>; + qcom,ipc = <&apcs 0x8 2>; + + interrupts = <0 19 0>, <0 21 0>, <0 22 0>; + interrupt-names = "ack", "err", "wakeup"; + + regulators { + compatible = "qcom,rpm-pm8921-regulators"; + vdd_l1_l2_l12_l18-supply = <&pm8921_s4>; + + s1 { + regulator-min-microvolt = <1225000>; + regulator-max-microvolt = <1225000>; + + bias-pull-down; + + qcom,switch-mode-frequency = <3200000>; + }; + + pm8921_s4: s4 { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + + qcom,switch-mode-frequency = <1600000>; + bias-pull-down; + + qcom,force-mode = <QCOM_RPM_FORCE_MODE_AUTO>; + }; + }; + }; + |