scsi: dt-bindings: ufs: ti,j721e-ufs.yaml: Add binding for TI UFS wrapper

Add binding documentation of TI wrapper for Cadence UFS Controller.

Link: https://lore.kernel.org/r/20191108164857.11466-2-vigneshr@ti.comReviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ufs/ti,j721e-ufs.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI J721e UFS Host Controller Glue Driver
+
+maintainers:
+  - Vignesh Raghavendra <vigneshr@ti.com>
+
+properties:
+  compatible:
+    items:
+      - const: ti,j721e-ufs
+
+  reg:
+    maxItems: 1
+    description: address of TI UFS glue registers
+
+  clocks:
+    maxItems: 1
+    description: phandle to the M-PHY clock
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - power-domains
+
+patternProperties:
+  "^ufs@[0-9a-f]+$":
+    type: object
+    description: |
+      Cadence UFS controller node must be the child node. Refer
+      Documentation/devicetree/bindings/ufs/cdns,ufshc.txt for binding
+      documentation of child node
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    ufs_wrapper: ufs-wrapper@4e80000 {
+       compatible = "ti,j721e-ufs";
+       reg = <0x0 0x4e80000 0x0 0x100>;
+       power-domains = <&k3_pds 277>;
+       clocks = <&k3_clks 277 1>;
+       assigned-clocks = <&k3_clks 277 1>;
+       assigned-clock-parents = <&k3_clks 277 4>;
+       #address-cells = <2>;
+       #size-cells = <2>;
+
+       ufs@4e84000 {
+          compatible = "cdns,ufshc-m31-16nm", "jedec,ufs-2.0";
+          reg = <0x0 0x4e84000 0x0 0x10000>;
+          interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
+          freq-table-hz = <19200000 19200000>;
+          power-domains = <&k3_pds 277>;
+          clocks = <&k3_clks 277 1>;
+          assigned-clocks = <&k3_clks 277 1>;
+          assigned-clock-parents = <&k3_clks 277 4>;
+          clock-names = "core_clk";
+       };
+    };