Re: [PATCH V2 5/5] dt-bindings: iio/adc: ingenic: add the JZ4760(B) socs to the sadc Documentation

Hello Johnathan, am I allowed to declare the property within the if
block like this?

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019-2020 Artur Rojek
%YAML 1.2
---
$id: "http://devicetree.org/schemas/iio/adc/ingenic,adc.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Ingenic JZ47xx ADC controller IIO bindings

maintainers:
  - Artur Rojek [off-list ref]

description: >
  Industrial I/O subsystem bindings for ADC controller found in
  Ingenic JZ47xx SoCs.

  ADC clients must use the format described in
  https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml,
  giving a phandle and IIO specifier pair ("io-channels") to the ADC controller.

properties:
  compatible:
    enum:
      - ingenic,jz4725b-adc
      - ingenic,jz4740-adc
      - ingenic,jz4760-adc
      - ingenic,jz4760b-adc
      - ingenic,jz4770-adc

  '#io-channel-cells':
    const: 1
    description:
      Must be set to <1> to indicate channels are selected by index.

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  clock-names:
    items:
      - const: adc

  interrupts:
    maxItems: 1

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - ingenic,jz4760b-adc
then:
  properties:
    ingenic,use-internal-divider:
      description:
        If present, battery voltage is read from the VBAT_IR pin, which has an
        internal 1/4 divider. If absent, it is read through the VBAT_ER pin,
        which does not have such a divider.
      type: boolean

required:
  - compatible
  - '#io-channel-cells'
  - reg
  - clocks
  - clock-names
  - interrupts

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/jz4740-cgu.h>
    #include <dt-bindings/iio/adc/ingenic,adc.h>

    adc@10070000 {
            compatible = "ingenic,jz4740-adc";
            #io-channel-cells = <1>;

            reg = <0x10070000 0x30>;

            clocks = <&cgu JZ4740_CLK_ADC>;
            clock-names = "adc";

            interrupt-parent = <&intc>;
            interrupts = <18>;
    };

On Fri, Jul 23, 2021 at 6:17 PM Jonathan Cameron
[off-list ref] wrote:

On Fri, 23 Jul 2021 10:58:13 +0200
Christophe Branchereau [off-list ref] wrote:

quoted

The jz4760b variant differs slightly from the jz4760, add a property to
let users sample the internal divider if needed and document it.

Signed-off-by: Christophe Branchereau <redacted>
---
 .../devicetree/bindings/iio/adc/ingenic,adc.yaml         | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
index 433a3fb55a2e..0dc42959a64f 100644
--- a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml

@@ -23,6 +23,8 @@ properties:
     enum:
       - ingenic,jz4725b-adc
       - ingenic,jz4740-adc
+      - ingenic,jz4760-adc
+      - ingenic,jz4760b-adc
       - ingenic,jz4770-adc

   '#io-channel-cells':

@@ -43,6 +45,13 @@ properties:
   interrupts:
     maxItems: 1

+  ingenic,use-internal-divider:
+    description:
+      This property can be used to set VBAT_SEL in the JZ4760B CFG register
+      to sample the battery voltage from the internal divider. If absent, it
+      will sample the external divider.
+    type: boolean
+

See reply to the v1 patch for hint on how to 'enforce' that this
only exists for the jz4760b

Thanks,

Jonathan

quoted

 required:
   - compatible
   - '#io-channel-cells'