dt-bindings: gnss: Rewrite sirfstar binding in YAML

This rewrites the SiRFstar DT bindings in YAML.

Cc: devicetree@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220317225844.1262643-3-linus.walleij@linaro.org

Documentation/devicetree/bindings/gnss/sirfstar.txt

-SiRFstar-based GNSS Receiver DT binding
-
-SiRFstar chipsets are used in GNSS-receiver modules produced by several
-vendors and can use UART, SPI or I2C interfaces.
-
-Please see Documentation/devicetree/bindings/gnss/gnss.txt for generic
-properties.
-
-Required properties:
-
-- compatible	: Must be one of
-
-			"fastrax,uc430"
-			"linx,r4"
-			"wi2wi,w2sg0004"
-			"wi2wi,w2sg0008i"
-			"wi2wi,w2sg0084i"
-
-- vcc-supply	: Main voltage regulator (pin name: 3V3_IN, VCC, VDD)
-
-Required properties (I2C):
-- reg		: I2C slave address
-
-Required properties (SPI):
-- reg		: SPI chip select address
-
-Optional properties:
-
-- sirf,onoff-gpios	: GPIO used to power on and off device (pin name: ON_OFF)
-- sirf,wakeup-gpios	: GPIO used to determine device power state
-			  (pin name: RFPWRUP, WAKEUP)
-- timepulse-gpios	: Time pulse GPIO (pin name: 1PPS, TM)
-
-Example:
-
-serial@1234 {
-	compatible = "ns16550a";
-
-	gnss {
-		compatible = "wi2wi,w2sg0084i";
-
-		vcc-supply = <&gnss_reg>;
-		sirf,onoff-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
-		sirf,wakeup-gpios = <&gpio0 17 GPIO_ACTIVE_HIGH>;
-	};
-};

Documentation/devicetree/bindings/gnss/sirfstar.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gnss/sirfstar.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SiRFstar GNSS Receiver Device Tree Bindings
+
+maintainers:
+  - Johan Hovold <johan@kernel.org>
+
+description:
+  The SiRFstar GNSS receivers have incarnated over the years in different
+  chips, starting from the SiRFstarIII which was a chip that was introduced in
+  2004 and used in a lot of dedicated GPS devices. In 2009 SiRF was acquired
+  by CSR (Cambridge Silicon Radio) and in 2012 the CSR GPS business was
+  acquired by Samsung, while some products remained with CSR. In 2014 CSR
+  was acquired by Qualcomm who still sell some of the SiRF products.
+
+  SiRF chips can be used over UART, I2C or SPI buses.
+
+allOf:
+  - $ref: gnss-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - fastrax,uc430
+      - linx,r4
+      - wi2wi,w2sg0004
+      - wi2wi,w2sg0008i
+      - wi2wi,w2sg0084i
+
+  reg:
+    description:
+      The I2C Address, SPI chip select address. Not required on UART buses.
+
+  vcc-supply:
+    description:
+      Main voltage regulator, pin names such as 3V3_IN, VCC, VDD.
+
+  sirf,onoff-gpios:
+    maxItems: 1
+    description: GPIO used to power on and off device, pin name ON_OFF.
+
+  sirf,wakeup-gpios:
+    maxItems: 1
+    description: GPIO used to determine device power state, pin names such
+      as RFPWRUP, WAKEUP.
+
+required:
+  - compatible
+  - vcc-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    serial {
+        gnss {
+            compatible = "wi2wi,w2sg0084i";
+            vcc-supply = <&gnss_vcc_reg>;
+            sirf,onoff-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
+            sirf,wakeup-gpios = <&gpio0 17 GPIO_ACTIVE_HIGH>;
+            current-speed = <38400>;
+        };
+    };