[PATCH v3 2/4] mfd: pm8xxx-spmi: document DT bindings for Qualcomm SPMI PMICs

[svarbanov@mm-sol.com (Stanimir Varbanov)]

Document DT bindings used to describe the Qualcomm SPMI PMICs.
Currently the SPMI PMICs supported are pm8941, pm8841 and pma8084.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
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 .../devicetree/bindings/mfd/qcom,pm8xxx-spmi.txt   |   49 ++++++++++++++++++++
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+          Qualcomm PM8XXX SPMI PMICs multi-function device bindings
+
+The Qualcomm PM8XXX 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.
+
+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.
+
+Required properties:
+- compatible:      Should contain one of:
+                     "qcom,pm8941"
+                     "qcom,pm8841"
+                     "qcom,pma8084"
+- reg:             Specifies the SPMI USID slave address for this device.
+                   For more information see:
+                   Documentation/devicetree/bindings/spmi/spmi.txt
+
+Required properties for peripheral child nodes:
+- compatible:      Should contain "qcom,pm8xxx-xxx", where "xxx" is
+                   peripheral name. The "pm8xxx" can be any of supported PMICs,
+                   see example below.
+
+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
+
+Each child node represents a function of the PMIC.
+
+Example:
+
+	pm8941 at 0 {
+		compatible = "qcom,pm8941";
+		reg = <0x0 SPMI_USID>;
+
+		rtc {
+			compatible = "qcom,pm8941-rtc";
+			interrupts = <0x0 0x61 0x1 IRQ_TYPE_EDGE_RISING>;
+			interrupt-names = "alarm";
+		};
+	};
-- 
1.7.0.4