iio: accel: yamaha-yas530: Add DT bindings

This adds device tree bindings for the Yamaha YAS530
family of magnetometers/compass sensors.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: phone-devel@vger.kernel.org
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jonathan Bakker <xc-racer2@live.ca>
Link: https://lore.kernel.org/r/20201224120820.1120099-1-linus.walleij@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/magnetometer/yamaha,yas530.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/magnetometer/yamaha,yas530.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Yamaha YAS530 family of magnetometer sensors
+
+maintainers:
+  - Linus Walleij <linus.walleij@linaro.org>
+
+description:
+  The Yamaha YAS530 magnetometers is a line of 3-axis magnetometers
+  first introduced by Yamaha in 2009 with the YAS530. They are successors
+  of Yamaha's first magnetometer YAS529. Over the years this magnetometer
+  has been miniaturized and appeared in a number of different variants.
+
+properties:
+  $nodename:
+    pattern: '^magnetometer@[0-9a-f]+$'
+
+  compatible:
+    items:
+      - enum:
+          - yamaha,yas530
+          - yamaha,yas532
+          - yamaha,yas533
+          - yamaha,yas535
+          - yamaha,yas536
+          - yamaha,yas537
+          - yamaha,yas539
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description: The YAS530 sensor has a RSTN pin used to reset
+      the logic inside the sensor. This GPIO line should connect
+      to that pin and be marked as GPIO_ACTIVE_LOW.
+
+  interrupts:
+    maxItems: 1
+    description: Interrupt for INT pin for interrupt generation.
+      The polarity, whether the interrupt is active on the rising
+      or the falling edge, is software-configurable in the hardware.
+
+  vdd-supply:
+    description: An optional regulator providing core power supply
+      on the VDD pin, typically 1.8 V or 3.0 V.
+
+  iovdd-supply:
+    description: An optional regulator providing I/O power supply
+      for the I2C interface on the IOVDD pin, typically 1.8 V.
+
+  mount-matrix:
+    description: An optional 3x3 mounting rotation matrix.
+
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            items:
+              const: yamaha,yas530
+    then:
+      properties:
+        reset-gpios: false
+
+  - if:
+      properties:
+        compatible:
+          items:
+            const: yamaha,yas539
+    then:
+      properties:
+        interrupts: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    i2c-0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        magnetometer@2e {
+          compatible = "yamaha,yas530";
+          reg = <0x2e>;
+          vdd-supply = <&ldo1_reg>;
+          iovdd-supply = <&ldo2_reg>;
+          reset-gpios = <&gpio6 12 GPIO_ACTIVE_LOW>;
+          interrupts = <&gpio6 13 IRQ_TYPE_EDGE_RISING>;
+        };
+    };
+
+    i2c-1 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        magnetometer@2e {
+          compatible = "yamaha,yas539";
+          reg = <0x2e>;
+          vdd-supply = <&ldo1_reg>;
+        };
+    };

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1252,6 +1252,8 @@ patternProperties:
     description: Shenzhen Xunlong Software CO.,Limited
   "^xylon,.*":
     description: Xylon
+  "^yamaha,.*":
+    description: Yamaha Corporation
   "^yes-optoelectronics,.*":
     description: Yes Optoelectronics Co.,Ltd.
   "^ylm,.*":