[PATCH 2/3] mfd: qpnp-spmi: document DT bindings for Qualcomm QPNP PMICs

[Stanimir Varbanov]

From: Ivan T. Ivanov <iivanov at mm-sol.com>

Document DT bindings used to describe the Qualcomm QPNP PMICs.

Signed-off-by: Ivan T. Ivanov <iivanov at mm-sol.com>
Signed-off-by: Stanimir Varbanov <svarbanov at mm-sol.com>
---
 .../devicetree/bindings/qpnp/qcom,qpnp-spmi.txt    |   53 ++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/qpnp/qcom,qpnp-spmi.txt

diff --git a/Documentation/devicetree/bindings/qpnp/qcom,qpnp-spmi.txt b/Documentation/devicetree/bindings/qpnp/qcom,qpnp-spmi.txt
new file mode 100644
index 0000000..24cde34
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+Qualcomm QPNP partitioned PMIC multi-function device bindings
+
+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 "qcom,qpnp-spmi"
+- reg:             Specifies the SPMI USID slave address for this device.
+                   For more information see:
+                   Documentation/devicetree/bindings/spmi/spmi.txt
+- #address-cells:  Defines address cells for peripheral nodes - should be 1
+- #size-cells:     Defines size cells for peripheral nodes - should be 0
+
+Required properties for peripheral child nodes:
+- compatible:      Should constain "qcom,qpnp-xxx"
+- reg:             One or more 16bits peripheral address(es)
+
+Optional properties for peripheral child nodes:
+- reg-names:       Shall be a string describing the reg resource.
+- 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 QPNP.  Each child 'reg' entry
+describes a QPNP peripheral address within the USID slave address space where
+the region starts.
+
+Example:
+
+	pm8941 at 0 {
+		compatible = "qcom,qpnp-spmi";
+		reg = <0x0 SPMI_USID>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		rtc at 6000 {
+			compatible = "qcom,qpnp-rtc";
+			reg = <0x6000 0x6100>;
+			reg-names = "rtc", "alarm";
+			interrupts = <0x0 0x61 0x1 IRQ_TYPE_EDGE_RISING>;
+		};
+	};
+
-- 
1.7.0.4