dt-bindings: soc: xilinx: ai-engine-npi: Add the binding for AIE NPI

This is the binding for AIE NPI space. This is a temporary or non-standard way by representing privileged NPI space as a device to non-secure world. Signed-off-by: Hyun Kwon <[email protected]> Reviewed-by: Wendy Liang <[email protected]> Signed-off-by: Michal Simek <[email protected]>
kowalewskijan · Apr 9, 2019 · 898a40b · 898a40b
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diff --git a/Documentation/devicetree/bindings/soc/xilinx/xlnx,ai-engine-npi.txt b/Documentation/devicetree/bindings/soc/xilinx/xlnx,ai-engine-npi.txt
@@ -0,0 +1,23 @@
+Xilinx AI Engine NPI
+--------------------
+
+The Xilinx AI Engine NPI space is where the privileged operations for AI Engine
+device are handled, such as reset and pll. The space is typically meant to be
+owned by platform management software, and this space is accessible only when
+the platform management software grants the access. Thus, this dt binding only
+works in such configuration, and in case the platform locks the access,
+the non-secure software fails to access the device.
+
+This is a temporary solution to allow direct access to NPI space.
+
+Required properties:
+
+- compatible: Must be "xlnx,ai-engine-npi"
+- reg: Physical base address and length of the registers set for the device.
+
+Example:
+
+	aie-npi@f70a0000 {
+		compatible = "xlnx,ai-engine-npi";
+		reg = <0x0 0xf70a0000 0x0 0x1000>;
+	};
diff --git a/MAINTAINERS b/MAINTAINERS
@@ -15414,6 +15414,11 @@ F:	Documentation/driver-api/uio-howto.rst
 F:	drivers/uio/
 F:	include/linux/uio*.h
 
+USERSPACE I/O (UIO) DRIVER FOR XILINX AI ENGINE NPI
+M:	Hyun Kwon <[email protected]>
+S:	Maintained
+F:	Documentation/devicetree/bindings/soc/xilinx/xlnx,ai-engine-npi.txt
+
 UTIL-LINUX PACKAGE
 M:	Karel Zak <[email protected]>
 L:	[email protected]