dt-bindings: add document of mediatek efuse driver

Add Mediatek MT8173 EFUSE Devicetree binding file

Signed-off-by: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
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/mtk-efuse.txt b/Documentation/devicetree/bindings/nvmem/mtk-efuse.txt
new file mode 100644 (file)
index 0000000..74cf529
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/mtk-efuse.txt
@@ -0,0 +1,36 @@
+= Mediatek MTK-EFUSE device tree bindings =
+
+This binding is intended to represent MTK-EFUSE which is found in most Mediatek SOCs.
+
+Required properties:
+- compatible: should be "mediatek,mt8173-efuse" or "mediatek,efuse"
+- reg: Should contain registers location and length
+
+= Data cells =
+Are child nodes of MTK-EFUSE, bindings of which as described in
+bindings/nvmem/nvmem.txt
+
+Example:
+
+       efuse: efuse@10206000 {
+               compatible = "mediatek,mt8173-efuse";
+               reg        = <0 0x10206000 0 0x1000>;
+               #address-cells = <1>;
+               #size-cells = <1>;
+
+               /* Data cells */
+               thermal_calibration: calib@528 {
+                       reg = <0x528 0xc>;
+               };
+       };
+
+= Data consumers =
+Are device nodes which consume nvmem data cells.
+
+For example:
+
+       thermal {
+               ...
+               nvmem-cells = <&thermal_calibration>;
+               nvmem-cell-names = "calibration";
+       };