[PATCH 1/2 v2] iio: accel: yamaha-yas53x: Add DT bindings

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This adds device tree bindings for the Yamaha YAS53x
magnetometers/compass sensors.

Cc: devicetree@xxxxxxxxxxxxxxx
Cc: phone-devel@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v2->v3:
- Restrict to cover the YAS53x variants, it turns out that
  YAS529 is a very different component from the others so
  keep that for a separate document when/if needed.
- Rename the file and binding yamaha,53x.yaml
- Use - if: clauses to restrict some properties.
- Fix some spelling mistakes.
- Restrict the nodename to be "magnetometer@[0-9a-f]"
ChangeLog v1->v2:
- Add Yamaha to the vendor list, I was surprised to find
  they were not yet listed.

I am still working on the actual driver for the magnetometer
but why not send out the DT bindings for review, the
hardware variants are easy to describe. This makes it possibe
for people to include these magnetometers in device
trees.
---
 .../iio/magnetometer/yamaha,yas53x.yaml       | 116 ++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 2 files changed, 118 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/yamaha,yas53x.yaml

diff --git a/Documentation/devicetree/bindings/iio/magnetometer/yamaha,yas53x.yaml b/Documentation/devicetree/bindings/iio/magnetometer/yamaha,yas53x.yaml
new file mode 100644
index 000000000000..e14668a6388d
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/magnetometer/yamaha,yas53x.yaml
@@ -0,0 +1,116 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/magnetometer/yamaha,yas53x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Yamaha YAS53x magnetometer sensors
+
+maintainers:
+  - Linus Walleij <linus.walleij@xxxxxxxxxx>
+
+description:
+  The Yamaha YAS53x 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:
+    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:
+    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:
+      properties:
+        compatible:
+          items:
+            const: yamaha,yas530
+    then:
+      properties:
+        reset-gpios:
+          maxItems: 1
+
+  - if:
+      properties:
+        compatible:
+          enum:
+            - yamaha,yas530
+            - yamaha,yas532
+            - yamaha,yas533
+            - yamaha,yas535
+            - yamaha,yas536
+            - yamaha,yas537
+    then:
+      properties:
+        interrupts:
+          maxItems: 1
+
+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>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 2735be1a8470..0340674c72bd 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1210,6 +1210,8 @@ patternProperties:
     description: Shenzhen Xunlong Software CO.,Limited
   "^xylon,.*":
     description: Xylon
+  "^yamaha,.*":
+    description: Yamaha Corporation
   "^ylm,.*":
     description: Shenzhen Yangliming Electronic Technology Co., Ltd.
   "^yna,.*":
-- 
2.26.2




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