Allwinner's D1, T113s and R329 SoCs have a new general purpose ADC.
This ADC is the same for all of this SoCs. The only difference is
the number of available channels.

Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com>
---
 .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
new file mode 100644
index 000000000000..a79b874750dd
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/allwinner,sun20i-d1-gpadc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner D1 General Purpose ADC
+
+properties:
+  "#io-channel-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  compatible:
+    enum:
+      - allwinner,sun20i-d1-gpadc
+      - allwinner,sun8i-t113-gpadc
+      - allwinner,sun50i-r329-gpadc
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - "#io-channel-cells"
+  - clocks
+  - compatible
+  - interrupts
+  - reg
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    gpadc: adc@2009000 {
+        compatible = "allwinner,sun20i-d1-gpadc";
+        reg = <0x2009000 0x1000>;
+        clocks = <&ccu CLK_BUS_GPADC>;
+        resets = <&ccu RST_BUS_GPADC>;
+        interrupts = <SOC_PERIPHERAL_IRQ(57) IRQ_TYPE_LEVEL_HIGH>;
+        #io-channel-cells = <0>;
+    };
+
+...
-- 
2.39.2

On Wed, 24 May 2023 11:27:31 +0300
Maxim Kiselev <bigunclemax@gmail.com> wrote:

> Allwinner's D1, T113s and R329 SoCs have a new general purpose ADC.
> This ADC is the same for all of this SoCs. The only difference is
> the number of available channels.
> 
> Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com>
> ---
>  .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> new file mode 100644
> index 000000000000..a79b874750dd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/allwinner,sun20i-d1-gpadc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner D1 General Purpose ADC
> +
> +properties:
> +  "#io-channel-cells":
> +    const: 0

That's odd for a device with more than one channel.  How do you reference
which channel you want to consume?

> +
> +  clocks:
> +    maxItems: 1
> +
> +  compatible:
> +    enum:
> +      - allwinner,sun20i-d1-gpadc
> +      - allwinner,sun8i-t113-gpadc
> +      - allwinner,sun50i-r329-gpadc
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - "#io-channel-cells"
> +  - clocks
> +  - compatible
> +  - interrupts
> +  - reg
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpadc: adc@2009000 {
> +        compatible = "allwinner,sun20i-d1-gpadc";
> +        reg = <0x2009000 0x1000>;
> +        clocks = <&ccu CLK_BUS_GPADC>;
> +        resets = <&ccu RST_BUS_GPADC>;
> +        interrupts = <SOC_PERIPHERAL_IRQ(57) IRQ_TYPE_LEVEL_HIGH>;

I guess the bot probably got this, but to use these macros you need some includes.

> +        #io-channel-cells = <0>;
> +    };
> +
> +...

On Wed, 24 May 2023 11:27:31 +0300, Maxim Kiselev wrote:
> Allwinner's D1, T113s and R329 SoCs have a new general purpose ADC.
> This ADC is the same for all of this SoCs. The only difference is
> the number of available channels.
> 
> Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com>
> ---
>  .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml: 'maintainers' is a required property
	hint: Metaschema for devicetree binding documentation
	from schema $id: http://devicetree.org/meta-schemas/base.yaml#
Error: Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.example.dts:27.28-29 syntax error
FATAL ERROR: Unable to parse input tree
make[1]: *** [scripts/Makefile.lib:419: Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.example.dtb] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:1512: dt_binding_check] Error 2

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230524082744.3215427-3-bigunclemax@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.