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mfd: Document DT bindings for Qualcomm SPMI PMICs
Document DT bindings used to describe the Qualcomm SPMI PMICs. Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Qualcomm SPMI PMICs multi-function device bindings | ||
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The Qualcomm SPMI series presently includes PM8941, PM8841 and PMA8084 | ||
PMICs. These PMICs use a QPNP scheme through SPMI interface. | ||
QPNP is effectively a partitioning scheme for dividing the SPMI extended | ||
register space up into logical pieces, and set of fixed register | ||
locations/definitions within these regions, with some of these regions | ||
specifically used for interrupt handling. | ||
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The QPNP PMICs are used with the Qualcomm Snapdragon series SoCs, and are | ||
interfaced to the chip via the SPMI (System Power Management Interface) bus. | ||
Support for multiple independent functions are implemented by splitting the | ||
16-bit SPMI slave address space into 256 smaller fixed-size regions, 256 bytes | ||
each. A function can consume one or more of these fixed-size register regions. | ||
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Required properties: | ||
- compatible: Should contain one of: | ||
"qcom,pm8941" | ||
"qcom,pm8841" | ||
"qcom,pma8084" | ||
or generalized "qcom,spmi-pmic". | ||
- reg: Specifies the SPMI USID slave address for this device. | ||
For more information see: | ||
Documentation/devicetree/bindings/spmi/spmi.txt | ||
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Required properties for peripheral child nodes: | ||
- compatible: Should contain "qcom,xxx", where "xxx" is a peripheral name. | ||
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Optional properties for peripheral child nodes: | ||
- interrupts: Interrupts are specified as a 4-tuple. For more information | ||
see: | ||
Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt | ||
- interrupt-names: Corresponding interrupt name to the interrupts property | ||
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Each child node of SPMI slave id represents a function of the PMIC. In the | ||
example below the rtc device node represents a peripheral of pm8941 | ||
SID = 0. The regulator device node represents a peripheral of pm8941 SID = 1. | ||
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Example: | ||
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spmi { | ||
compatible = "qcom,spmi-pmic-arb"; | ||
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pm8941@0 { | ||
compatible = "qcom,pm8941", "qcom,spmi-pmic"; | ||
reg = <0x0 SPMI_USID>; | ||
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rtc { | ||
compatible = "qcom,rtc"; | ||
interrupts = <0x0 0x61 0x1 IRQ_TYPE_EDGE_RISING>; | ||
interrupt-names = "alarm"; | ||
}; | ||
}; | ||
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pm8941@1 { | ||
compatible = "qcom,pm8941", "qcom,spmi-pmic"; | ||
reg = <0x1 SPMI_USID>; | ||
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regulator { | ||
compatible = "qcom,regulator"; | ||
regulator-name = "8941_boost"; | ||
}; | ||
}; | ||
}; |