[PATCH 2/2] staging: iio: ad2s1210: Add devicetree yaml doc

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The driver currently has no devicetree documentation. This commit adds a
devicetree folder and documentation for it. Documentation must be moved
as well when the driver gets out of staging.

Signed-off-by: Tallys Martins <tallysmartins@xxxxxxxxx>
Signed-off-by: Souza Guilherme <gdsdsilva@xxxxxxxxxxxxxxxx>
Co-developed-by: Souza Guilherme <gdsdsilva@xxxxxxxxxxxxxxxx>
---
 .../Documentation/devicetree/ad2s1210.yaml    | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 drivers/staging/iio/Documentation/devicetree/ad2s1210.yaml

diff --git a/drivers/staging/iio/Documentation/devicetree/ad2s1210.yaml b/drivers/staging/iio/Documentation/devicetree/ad2s1210.yaml
new file mode 100644
index 000000000000..733aa07b4626
--- /dev/null
+++ b/drivers/staging/iio/Documentation/devicetree/ad2s1210.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/iio/ad2s1210.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: |
+  Analog Devices Inc. AD2S1210 10-Bit to 16-Bit R/D Converters
+
+maintainers:
+  - Graff Yang <graff.yang@xxxxxxxxx>
+
+description: |
+  Analog Devices AD2S1210 Resolver to Digital SPI driver
+
+  https://www.analog.com/en/products/ad2s1210.html
+
+properties:
+  compatible:
+    enum:
+      - adi,ad2s1210
+
+  reg:
+    maxItems: 1
+
+  clock-frequency:
+    minimum: 2000
+    maximum: 20000
+    default: 8192
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+  resolver@0 {
+    compatible = "adi,ad2s1210";
+    reg = <0>;
+  };
+...
-- 
2.21.0

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