dts: arm: nordic: Add radio peripheral with DFE antenna config

Add radio peripheral to nrf52833 DTS including antenna matrix
congiuration for Direction Finding extennsion.
Add appropriate binding file for nRF radio peripheral.

There is no default antenna matrix configuration. Antennas number
and GPIOS mapping to DFEGPIOS is project specific.
Complete configuration must be provided by end user as overaly.

Signed-off-by: Piotr Pryga <[email protected]>

Author: ppryga-nordic

dts/arm/nordic/nrf52833.dtsi

@@ -387,6 +387,14 @@
 			reg = <0x10001000 0x1000>;
 			status = "okay";
 		};
+
+		radio: radio@40001000 {
+			compatible = "nordic,nrf-radio";
+			reg = <0x40001000 0x1000>;
+			interrupts = <1 NRF_DEFAULT_IRQ_PRIORITY>;
+			status = "okay";
+			dfe-ant-num = <0>;
+		};
 	};
 
 	sw_pwm: sw-pwm {

dts/bindings/net/wireless/nordic,nrf-radio.yaml

@@ -0,0 +1,111 @@
+# Copyright (c) 2020 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+    Nordic nRF family RADIO
+
+    dfegpio[n]-gpios properties provide GPIO pins to the radio peripheral. These
+    GPIO pins are used to drive antennas switching by Radio Direction Finding
+    Extension. E.g. to use 12 antennas 4 GPIO pins must be provided;
+    4 GPIO pins support switching up to 16 antennas.
+
+    The dfegpio[n] properties are used to initialize the PSEL.DFEGPIO[n]
+    registers. None of the dfegpio[n]-gpios properties are marked required,
+    since which Radio PSEL.DFEGPIO[n] registers will be used to drive antenna
+    switches depends on the use case.
+
+    Nevertheless, at least two antennas must be available. That means at
+    least one dfegpio[n]-gpios property must be provided, to give the radio
+    the possibility to switch between two antennas.
+
+compatible: "nordic,nrf-radio"
+
+include: [base.yaml]
+
+properties:
+    reg:
+      required: true
+
+    interrupts:
+      required: true
+
+    dfe-ant-num:
+      type: int
+      required: true
+      description: |
+        Number of available antennas.
+
+        Value zero means no antenna available. If provided value different than
+        zero, it must be greater or equal to two.
+
+    dfegpio0-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 0
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio1-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 1
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio2-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 2
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio3-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 3
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio4-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 4
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio5-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 5
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio6-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 6
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.
+
+    dfegpio7-gpios:
+      type: phandle-array
+      required: false
+      description: |
+        Pin select for DFE pin 7
+
+        Flags cell in the property is not used for GPIO pin initialization
+        and should be set to zero.