drivers: Add GTE support

The CL adds GTE driver support in OOT. The driver is copied from nvidia
directory in dev-main with below changes.
- Added removable module support

This driver as module is needed as per the oot development requirement.

Bug 3583612

Change-Id: I2772078fb96e1b172e45befe643b4c7c569866d9
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2706260
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

Documentation/devicetree/bindings/tegra_gte/tegra-gte.yaml

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/tegra_gte/tegra-gte.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra T194 GTE (Generic hardware Timestamping Engine) bindings
+
+maintainers:
+  - Dipen Patel <dipenp@nvidia.com>
+
+description: |+
+  GTE is a hardware block which monitors various events for the state change and
+  timestamps them using TSC counter. Tegra implements LIC GTE and AON GTE
+  instances. LIC GTE is used only to monitor LIC IRQ lines and AON GTE is used
+  to monitor Always On domain GPIO lines.
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra194-gte-lic
+      - nvidia,tegra194-gte-aon
+      - nvidia,tegra234-gte-aon
+
+  reg:
+    maxItems: 1
+    description: physical base address.
+
+  interrupts:
+    description:
+	    interrupt number
+
+  nvidia,int-threshold:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      GTE device generates its interrupt based on this u32 FIFO threshold
+      value. The recommended value is 1.
+    minimum: 1
+    maximum: 256
+
+  nvidia,num-slices:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      GTE lines are arranged in 32 bit slice where each bit represents different
+      line/signal that it can enable/configure for the timestamp. It is u32
+      property and the value depends on the GTE instance in the chip. Tegra194
+      LIC instance uses 11 slices while Tegra234 instance uses 17 slices to
+      represent interrupts line from LIC. The AON-GPIO GTE instances for both
+      Tegra194 and Tegra234 use 3 slices for the GPIO.
+    enum: [3, 11, 17]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - nvidia,num-slices
+
+additionalProperties: false
+
+examples:
+  - |
+    gte@3aa0000 {
+        interrupts = <0x00 0x0b 0x04>;
+        compatible = "nvidia,tegra194-gte-lic";
+        nvidia,int-threshold = <0x01>;
+        status = "okay";
+        nvidia,num-slices = <0x11>;
+        reg = <0x3aa0000 0x10000>;
+    };
+
+    gte@c1e0000 {
+        interrupts = <0x00 0x0d 0x04>;
+        compatible = "nvidia,tegra234-gte-aon";
+        nvidia,int-threshold = <0x01>;
+        status = "okay";
+        nvidia,num-slices = <0x03>;
+        reg = <0xc1e0000 0x10000>;
+    };

Documentation/ioctl/ioctl-number.txt

@@ -0,0 +1,7 @@
+Ioctl Numbers
+21 February 2020
+Dipen Patel
+
+Code  Seq#(hex)	Include File		Comments
+========================================================
+0xB5	00	linux/tegra-gte-ioctl.h