dt-bindings: nvmem: Add Spreadtrum SC27XX efuse controller documentation

This patch adds the binding documentation for Spreadtrum SC27XX series
PMICs efuse controller device.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/nvmem/sc27xx-efuse.txt b/Documentation/devicetree/bindings/nvmem/sc27xx-efuse.txt
new file mode 100644 (file)
index 0000000..586c082
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/sc27xx-efuse.txt
@@ -0,0 +1,52 @@
+= Spreadtrum SC27XX PMIC eFuse device tree bindings =
+
+Required properties:
+- compatible: Should be one of the following.
+       "sprd,sc2720-efuse"
+       "sprd,sc2721-efuse"
+       "sprd,sc2723-efuse"
+       "sprd,sc2730-efuse"
+       "sprd,sc2731-efuse"
+- reg: Specify the address offset of efuse controller.
+- hwlocks: Reference to a phandle of a hwlock provider node.
+
+= Data cells =
+Are child nodes of eFuse, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+Example:
+
+       sc2731_pmic: pmic@0 {
+               compatible = "sprd,sc2731";
+               reg = <0>;
+               spi-max-frequency = <26000000>;
+               interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               efuse@380 {
+                       compatible = "sprd,sc2731-efuse";
+                       reg = <0x380>;
+                       #address-cells = <1>;
+                       #size-cells = <1>;
+                       hwlocks = <&hwlock 12>;
+
+                       /* Data cells */
+                       thermal_calib: calib@10 {
+                               reg = <0x10 0x2>;
+                       };
+               };
+       };
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+Example:
+
+       thermal {
+               ...
+               nvmem-cells = <&thermal_calib>;
+               nvmem-cell-names = "calibration";
+       };