dt-bindings: soc: add binding for i.MX8MP HSIO blk-ctrl

This adds the binding for the HSIO blk-ctrl on the i.MX8MP SoC.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/soc/imx/fsl,imx8mp-hsio-blk-ctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/imx/fsl,imx8mp-hsio-blk-ctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP i.MX8MP HSIO blk-ctrl
+
+maintainers:
+  - Lucas Stach <l.stach@pengutronix.de>
+
+description:
+  The i.MX8MP HSIO blk-ctrl is a top-level peripheral providing access to
+  the NoC and ensuring proper power sequencing of the high-speed IO
+  (USB an PCIe) peripherals located in the HSIO domain of the SoC.
+
+properties:
+  compatible:
+    items:
+      - const: fsl,imx8mp-hsio-blk-ctrl
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  '#power-domain-cells':
+    const: 1
+
+  power-domains:
+    minItems: 6
+    maxItems: 6
+
+  power-domain-names:
+    items:
+      - const: bus
+      - const: usb
+      - const: usb-phy1
+      - const: usb-phy2
+      - const: pcie
+      - const: pcie-phy
+
+  clocks:
+    minItems: 2
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: usb
+      - const: pcie
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - power-domain-names
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8mp-clock.h>
+    #include <dt-bindings/power/imx8mp-power.h>
+
+    hsio_blk_ctrl: blk-ctrl@32f10000 {
+        compatible = "fsl,imx8mp-hsio-blk-ctrl", "syscon";
+        reg = <0x32f10000 0x24>;
+        clocks = <&clk IMX8MP_CLK_USB_ROOT>,
+                 <&clk IMX8MP_CLK_PCIE_ROOT>;
+        clock-names = "usb", "pcie";
+        power-domains = <&pgc_hsiomix>, <&pgc_hsiomix>,
+                        <&pgc_usb1_phy>, <&pgc_usb2_phy>,
+                        <&pgc_hsiomix>, <&pgc_pcie_phy>;
+        power-domain-names = "bus", "usb", "usb-phy1",
+                             "usb-phy2", "pcie", "pcie-phy";
+        #power-domain-cells = <1>;
+    };