dt-bindings: reset: Add bindings for ZynqMP reset driver

Add documentation to describe Xilinx ZynqMP reset driver
bindings.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/reset/xlnx,zynqmp-reset.txt b/Documentation/devicetree/bindings/reset/xlnx,zynqmp-reset.txt
new file mode 100644
index 000000000000..27a45fe5ecf1
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/xlnx,zynqmp-reset.txt
@@ -0,0 +1,52 @@
+--------------------------------------------------------------------------
+ =  Zynq UltraScale+ MPSoC reset driver binding =
+--------------------------------------------------------------------------
+The Zynq UltraScale+ MPSoC has several different resets.
+
+See Chapter 36 of the Zynq UltraScale+ MPSoC TRM (UG) for more information
+about zynqmp resets.
+
+Please also refer to reset.txt in this directory for common reset
+controller binding usage.
+
+Required Properties:
+- compatible:	"xlnx,zynqmp-reset"
+- #reset-cells:	Specifies the number of cells needed to encode reset
+		line, should be 1
+
+-------
+Example
+-------
+
+firmware {
+	zynqmp_firmware: zynqmp-firmware {
+		compatible = "xlnx,zynqmp-firmware";
+		method = "smc";
+
+		zynqmp_reset: reset-controller {
+			compatible = "xlnx,zynqmp-reset";
+			#reset-cells = <1>;
+		};
+	};
+};
+
+Specifying reset lines connected to IP modules
+==============================================
+
+Device nodes that need access to reset lines should
+specify them as a reset phandle in their corresponding node as
+specified in reset.txt.
+
+For list of all valid reset indicies see
+<dt-bindings/reset/xlnx-zynqmp-resets.h>
+
+Example:
+
+serdes: zynqmp_phy@fd400000 {
+	...
+
+	resets = <&zynqmp_reset ZYNQMP_RESET_SATA>;
+	reset-names = "sata_rst";
+
+	...
+};