ARM: dts: qcom: Add binding for the qcom coincell charger

This binding is used to configure the driver for the coincell charger
found in Qualcomm PMICs.

Signed-off-by: Tim Bird <tim.bird@sonymobile.com>
Reviewed-by: Andy Gross <agross@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/power/qcom,coincell-charger.txt b/Documentation/devicetree/bindings/power/qcom,coincell-charger.txt
new file mode 100644 (file)
index 0000000..0e6d875
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/qcom,coincell-charger.txt
@@ -0,0 +1,48 @@
+Qualcomm Coincell Charger:
+
+The hardware block controls charging for a coincell or capacitor that is
+used to provide power backup for certain features of the power management
+IC (PMIC)
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: must be: "qcom,pm8941-coincell"
+
+- reg:
+       Usage: required
+       Value type: <u32>
+       Definition: base address of the coincell charger registers
+
+- qcom,rset-ohms:
+       Usage: required
+       Value type: <u32>
+       Definition: resistance (in ohms) for current-limiting resistor
+               must be one of: 800, 1200, 1700, 2100
+
+- qcom,vset-millivolts:
+       Usage: required
+       Value type: <u32>
+       Definition: voltage (in millivolts) to apply for charging
+               must be one of: 2500, 3000, 3100, 3200
+
+- qcom,charger-disable:
+       Usage: optional
+       Value type: <boolean>
+       Definition: definining this property disables charging
+
+This charger is a sub-node of one of the 8941 PMIC blocks, and is specified
+as a child node in DTS of that node.  See ../mfd/qcom,spmi-pmic.txt and
+../mfd/qcom-pm8xxx.txt
+
+Example:
+
+       pm8941@0 {
+               coincell@2800 {
+                       compatible = "qcom,pm8941-coincell";
+                       reg = <0x2800>;
+
+                       qcom,rset-ohms = <2100>;
+                       qcom,vset-millivolts = <3000>;
+               };
+       };