dt-bindings: Clean-up regulator '-supply' schemas

Regulator '*-supply' properties are always a single phandle, so
'maxItems: 1' or a $ref is not necessary. All that's needed is either
'true' or an optional 'description'. Following this clean-up, the
meta-schema will enforce this pattern.

There's one case in tree with 'innolux,n156bge-l21' having 2 phandles.
This appears to be a mistake or abuse of simple-panel as it's 2 different
voltage rails connected to 'power-supply'.

Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-iio@vger.kernel.org
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Signed-off-by: Rob Herring <robh@kernel.org>

7 files changed, 2 insertions, 15 deletions

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
index 9692b7f719f5..e932d5aed02f 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
@@ -45,15 +45,12 @@ properties:
 
   refin1-supply:
     description: refin1 supply can be used as reference for conversion.
-    maxItems: 1
 
   refin2-supply:
     description: refin2 supply can be used as reference for conversion.
-    maxItems: 1
 
   avdd-supply:
     description: avdd supply can be used as reference for conversion.
-    maxItems: 1
 
 required:
   - compatible
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index cc544fdc38be..6eb33207a167 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -31,10 +31,7 @@ properties:
 
   spi-cpha: true
 
-  avcc-supply:
-    description:
-      Phandle to the Avcc power supply
-    maxItems: 1
+  avcc-supply: true
 
   interrupts:
     maxItems: 1
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml
index d1109416963c..9acde6d2e2d9 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml
@@ -39,7 +39,6 @@ properties:
   avdd-supply:
     description:
       The regulator supply for the ADC reference voltage.
-    maxItems: 1
 
   powerdown-gpios:
     description:
diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
index d76ece97c76c..91ab9c842273 100644
--- a/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/avia-hx711.yaml
@@ -41,7 +41,6 @@ properties:
   avdd-supply:
     description:
       Definition of the regulator used as analog supply
-    maxItems: 1
 
   clock-frequency:
     minimum: 20000
diff --git a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
index b4c6c26681d9..9218b2efa62f 100644
--- a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
@@ -46,9 +46,7 @@ properties:
   "#io-channel-cells":
     const: 1
 
-  vdd-supply:
-    description: VDD input supply
-    maxItems: 1
+  vdd-supply: true
 
   samsung,syscon-phandle:
     $ref: '/schemas/types.yaml#/definitions/phandle'
diff --git a/Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml b/Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml
index a551d3101f93..19e53930ebf6 100644
--- a/Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml
+++ b/Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml
@@ -25,7 +25,6 @@ properties:
 
   vcc-supply:
     description: regulator that provides power to the sensor
-    maxItems: 1
 
   plantower,set-gpios:
     description: GPIO connected to the SET line
diff --git a/Documentation/devicetree/bindings/iio/pressure/bmp085.yaml b/Documentation/devicetree/bindings/iio/pressure/bmp085.yaml
index c6721a7e8938..519137e5c170 100644
--- a/Documentation/devicetree/bindings/iio/pressure/bmp085.yaml
+++ b/Documentation/devicetree/bindings/iio/pressure/bmp085.yaml
@@ -28,12 +28,10 @@ properties:
   vddd-supply:
     description:
       digital voltage regulator (see regulator/regulator.txt)
-    maxItems: 1
 
   vdda-supply:
     description:
       analog voltage regulator (see regulator/regulator.txt)
-    maxItems: 1
 
   reset-gpios:
     description: