dt-bindings:iio:adc:nuvoton,npcm750-adc yaml conversion

Renamed the file to reflect the only compatible.
Added #io-channel-cells to make it easier to support consumers of the
ADC channels this device provides.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Tomer Maimon <tmaimon77@gmail.com>
Link: https://lore.kernel.org/r/20200909175946.395313-9-jic23@kernel.org

Documentation/devicetree/bindings/iio/adc/nuvoton,npcm-adc.txt

-Nuvoton NPCM Analog to Digital Converter (ADC)
-
-The NPCM ADC is a 10-bit converter for eight channel inputs.
-
-Required properties:
-- compatible: "nuvoton,npcm750-adc" for the NPCM7XX BMC.
-- reg: specifies physical base address and size of the registers.
-- interrupts: Contain the ADC interrupt with flags for falling edge.
-- resets : phandle to the reset control for this device.
-
-Optional properties:
-- clocks: phandle of ADC reference clock, in case the clock is not
-		  added the ADC will use the default ADC sample rate.
-- vref-supply: The regulator supply ADC reference voltage, in case the
-			   vref-supply is not added the ADC will use internal voltage
-			   reference.
-
-Example:
-
-adc: adc@f000c000 {
-	compatible = "nuvoton,npcm750-adc";
-	reg = <0xf000c000 0x8>;
-	interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
-	clocks = <&clk NPCM7XX_CLK_ADC>;
-	resets = <&rstc NPCM7XX_RESET_IPSRST1 NPCM7XX_RESET_ADC>;
-};

Documentation/devicetree/bindings/iio/adc/nuvoton,npcm750-adc.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/nuvoton,npcm750-adc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NPCM BMC Analog to Digital Converter (ADC)
+
+maintainers:
+  - Tomer Maimon <tmaimon77@gmail.com>
+
+description:
+  The NPCM ADC is a 10-bit converter for eight channel inputs.
+
+properties:
+  compatible:
+    const: nuvoton,npcm750-adc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description: ADC interrupt, should be set for falling edge.
+
+  resets:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description: If not provided the defulat ADC sample rate will be used.
+
+  vref-supply:
+    description: If not supplied, the internal voltage reference will be used.
+
+  "#io-channel-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/nuvoton,npcm7xx-clock.h>
+    #include <dt-bindings/reset/nuvoton,npcm7xx-reset.h>
+    soc {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        adc@f000c000 {
+            compatible = "nuvoton,npcm750-adc";
+            reg = <0xf000c000 0x8>;
+            interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&clk NPCM7XX_CLK_ADC>;
+            resets = <&rstc NPCM7XX_RESET_IPSRST1 NPCM7XX_RESET_ADC>;
+        };
+    };
+...