dt-bindings: net: wireless: qca,ath9k: convert to the json-schema

This replaces the existing .txt binding file. Furthermore, this
also helps with validating DTS files.

Introduced binding changes:
 1. added inherited mac-address nvmem property
 2. added inherited ieee80211-freq-limit property
 3. added new calibration nvmem property
 4. added second example (taken from the Netgear WNDR3700v2)
    Reason: Setting qca,no-eeprom; takes presedence over
    nvmem-cells. I think a different example is needed,
    because the driver can only reads from one calibration
    source per device.
 5. (re-added) chip list (based on data from ath9k's pci.c)

Added binding .yaml to MAINTAINERS.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210924223509.52525-1-chunkeey@gmail.com

Documentation/devicetree/bindings/net/wireless/qca,ath9k.txt

-* Qualcomm Atheros ath9k wireless devices
-
-This node provides properties for configuring the ath9k wireless device. The
-node is expected to be specified as a child node of the PCI controller to
-which the wireless chip is connected.
-
-Required properties:
-- compatible: For PCI and PCIe devices this should be an identifier following
-		the format as defined in "PCI Bus Binding to Open Firmware"
-		Revision 2.1. One of the possible formats is "pciVVVV,DDDD"
-		where VVVV is the PCI vendor ID and DDDD is PCI device ID.
-		Typically QCA's PCI vendor ID 168c is used while the PCI device
-		ID depends on the chipset - see the following (possibly
-		incomplete) list:
-			- 0023 for AR5416
-			- 0024 for AR5418
-			- 0027 for AR9160
-			- 0029 for AR9220 and AR9223
-			- 002a for AR9280 and AR9283
-			- 002b for AR9285
-			- 002c for AR2427
-			- 002d for AR9227
-			- 002e for AR9287
-			- 0030 for AR9380, AR9381 and AR9382
-			- 0032 for AR9485
-			- 0033 for AR9580 and AR9590
-			- 0034 for AR9462
-			- 0036 for AR9565
-			- 0037 for AR9485
-- reg: Address and length of the register set for the device.
-
-Optional properties:
-- qca,no-eeprom: Indicates that there is no physical EEPROM connected to the
-			ath9k wireless chip (in this case the calibration /
-			EEPROM data will be loaded from userspace using the
-			kernel firmware loader).
-
-The MAC address will be determined using the optional properties defined in
-net/ethernet.txt.
-
-In this example, the node is defined as child node of the PCI controller:
-&pci0 {
-	wifi@168c,002d {
-		compatible = "pci168c,002d";
-		reg = <0x7000 0 0 0 0x1000>;
-		qca,no-eeprom;
-	};
-};

Documentation/devicetree/bindings/net/wireless/qca,ath9k.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/wireless/qca,ath9k.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Atheros ath9k wireless devices Generic Binding
+
+maintainers:
+  - Kalle Valo <kvalo@codeaurora.org>
+
+description: |
+  This node provides properties for configuring the ath9k wireless device.
+  The node is expected to be specified as a child node of the PCI controller
+  to which the wireless chip is connected.
+
+allOf:
+  - $ref: ieee80211.yaml#
+
+properties:
+  compatible:
+    enum:
+      - pci168c,0023  # AR5416
+      - pci168c,0024  # AR5418
+      - pci168c,0027  # AR9160
+      - pci168c,0029  # AR9220 and AR9223
+      - pci168c,002a  # AR9280 and AR9283
+      - pci168c,002b  # AR9285
+      - pci168c,002c  # AR2427 - 802.11n bonded out
+      - pci168c,002d  # AR9227
+      - pci168c,002e  # AR9287
+      - pci168c,0030  # AR9380, AR9381 and AR9382
+      - pci168c,0032  # AR9485
+      - pci168c,0033  # AR9580 and AR9590
+      - pci168c,0034  # AR9462
+      - pci168c,0036  # AR9565
+      - pci168c,0037  # AR1111 and AR9485
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  ieee80211-freq-limit: true
+
+  qca,no-eeprom:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates that there is no physical EEPROM connected
+
+  nvmem-cells:
+    items:
+      - description: Reference to an nvmem node for the MAC address
+      - description: Reference to an nvmem node for calibration data
+
+  nvmem-cell-names:
+    items:
+      - const: mac-address
+      - const: calibration
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    pcie0 {
+      #address-cells = <3>;
+      #size-cells = <2>;
+      wifi@0,0 {
+        compatible = "pci168c,002d";
+        reg = <0 0 0 0 0>;
+        interrupts = <3>;
+        qca,no-eeprom;
+      };
+    };
+  - |
+    pci0 {
+      #address-cells = <3>;
+      #size-cells = <2>;
+      wifi@0,11 {
+        compatible = "pci168c,0029";
+        reg = <0x8800 0 0 0 0>;
+        nvmem-cells = <&macaddr_art_c>, <&cal_art_1000>;
+        nvmem-cell-names = "mac-address", "calibration";
+      };
+    };

MAINTAINERS

@@ -15456,6 +15456,7 @@ M:	ath9k-devel@qca.qualcomm.com
 L:	linux-wireless@vger.kernel.org
 S:	Supported
 W:	https://wireless.wiki.kernel.org/en/users/Drivers/ath9k
+F:	Documentation/devicetree/bindings/net/wireless/qca,ath9k.yaml
 F:	drivers/net/wireless/ath/ath9k/
 
 QUALCOMM CAMERA SUBSYSTEM DRIVER