ARC: reset: add missing DT binding documentation for HSDKv1 reset driver

When applying the original patch [1], the DT binding docs were lost.
This patch adds them back.

[1] https://patchwork.kernel.org/patch/9852997/

Fixes: e0be864f1424 ("ARC: reset: introduce HSDKv1 reset driver")
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/reset/snps,hsdk-v1-reset.txt b/Documentation/devicetree/bindings/reset/snps,hsdk-v1-reset.txt
new file mode 100644 (file)
index 0000000..6a68146
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/snps,hsdk-v1-reset.txt
@@ -0,0 +1,28 @@
+Binding for the HSDK v1 reset controller
+
+This binding uses the common reset binding[1].
+
+[1] Documentation/devicetree/bindings/reset/reset.txt
+
+Required properties:
+- compatible: should be "snps,hsdk-v1.0-reset".
+- reg: should always contain 2 pairs address - length: first for reset
+  configuration register and second for corresponding SW reset and status bits
+  register.
+- #reset-cells: from common reset binding; Should always be set to 1.
+
+Example:
+       reset: reset@880 {
+               compatible = "snps,hsdk-v1.0-reset";
+               #reset-cells = <1>;
+               reg = <0x8A0 0x4>, <0xFF0 0x4>;
+       };
+
+Specifying reset lines connected to IP modules:
+       ethernet@.... {
+               ....
+               resets = <&reset HSDK_V1_ETH_RESET>;
+               ....
+       };
+
+The index could be found in <dt-bindings/reset/snps,hsdk-v1-reset.h>