65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
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* msm-qpnp-rtc
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msm-qpnp-rtc is a RTC driver that supports 32 bit RTC housed inside PMIC.
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Driver utilizes MSM SPMI interface to communicate with the RTC module.
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RTC device is divided into two sub-peripherals one which controls basic RTC
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and other for controlling alarm.
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[PMIC RTC Device Declarations]
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-Root Node-
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Required properties :
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- compatible: Must be "qcom,qpnp-rtc"
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- #address-cells: The number of cells dedicated to represent an address
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This must be set to '1'.
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- #size-cells: The number of cells dedicated to represent address
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space range of a peripheral. This must be set to '1'.
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- spmi-dev-container: This specifies that all the device nodes specified
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within this node should have their resources
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coalesced into a single spmi_device.
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Optional properties:
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- qcom,qpnp-rtc-write: This property enables/disables rtc write
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operation. If not mentioned rtc driver keeps
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rtc writes disabled.
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0 = Disable rtc writes.
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1 = Enable rtc writes.
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- qcom,qpnp-rtc-alarm-pwrup: This property enables/disables feature of
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powering up phone (from power down state)
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through alarm interrupt.
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If not mentioned rtc driver will disable
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feature of powring-up phone through alarm.
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0 = Disable powering up of phone through
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alarm interrupt.
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1 = Enable powering up of phone through
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alarm interrupt.
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-Child Nodes-
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Required properties :
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- reg : Specify the spmi offset and size for device.
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- interrupts: Specifies alarm interrupt, only for rtc_alarm
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sub-peripheral.
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Example:
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qcom,pm8941_rtc {
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spmi-dev-container;
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compatible = "qcom,qpnp-rtc";
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#address-cells = <1>;
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#size-cells = <1>;
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qcom,qpnp-rtc-write = <0>;
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qcom,qpnp-rtc-alarm-pwrup = <0>;
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qcom,pm8941_rtc_rw@6000 {
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reg = <0x6000 0x100>;
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};
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qcom,pm8941_rtc_alarm@6100 {
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reg = <0x6100 0x100>;
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interrupts = <0x0 0x61 0x1>;
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};
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};
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