dt-bindings: Another pass removing cases of 'allOf' containing a '$ref'

Another pass at removing unnecessary use of 'allOf' with a '$ref'.

json-schema versions draft7 and earlier have a weird behavior in that
any keywords combined with a '$ref' are ignored (silently). The correct
form was to put a '$ref' under an 'allOf'. This behavior is now changed
in the 2019-09 json-schema spec and '$ref' can be mixed with other
keywords.

Cc: Krzysztof Kozlowski <[e-mail]>
Cc: Thierry Reding <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Cc: Dmitry Torokhov <[e-mail]>
Cc: Pavel Machek <[e-mail]>
Cc: Guenter Roeck <[e-mail]>
Cc: Richard Weinberger <[e-mail]>
Cc: Vignesh Raghavendra <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Cc: Kishon Vijay Abraham I <[e-mail]>
Cc: Sebastian Reichel <[e-mail]>
Cc: Mathieu Poirier <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Acked-By: Vinod Koul <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Acked-by: Marek Behún <[e-mail]>
Acked-by: Miquel Raynal <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Acked-by: Jakub Kicinski <[e-mail]>
Acked-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/connector/usb-connector.yaml

···
       - "1.5A" and "3.0A", 5V 1.5A and 5V 3.0A respectively, as defined in USB
         Type-C Cable and Connector specification, when Power Delivery is not
         supported.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/string
+    $ref: /schemas/types.yaml#/definitions/string
     enum:
       - default
       - 1.5A

Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml

···
       - const: hpd-removed
 
   ddc:
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
     description: >
       Phandle of the I2C controller used for DDC EDID probing
 

Documentation/devicetree/bindings/display/bridge/adi,adv7511.yaml

···
 
   adi,input-depth:
     description: Number of bits per color component at the input.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - enum: [ 8, 10, 12 ]
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 8, 10, 12 ]
 
   adi,input-colorspace:
     description: Input color space.

Documentation/devicetree/bindings/display/bridge/synopsys,dw-hdmi.yaml

···
   reg-io-width:
     description:
       Width (in bytes) of the registers specified by the reg property.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - enum: [1, 4]
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 4]
     default: 1
 
   clocks:

Documentation/devicetree/bindings/display/panel/display-timings.yaml

···
 patternProperties:
   "^timing":
     type: object
-    allOf:
-      - $ref: panel-timing.yaml#
+    $ref: panel-timing.yaml#
 
 additionalProperties: false
 

Documentation/devicetree/bindings/display/ste,mcde.yaml

···
   "^dsi@[0-9a-f]+$":
     description: subnodes for the three DSI host adapters
     type: object
-    allOf:
-      - $ref: dsi-controller.yaml#
+    $ref: dsi-controller.yaml#
+
     properties:
       compatible:
         const: ste,mcde-dsi

Documentation/devicetree/bindings/input/adc-joystick.yaml

···
         description: EV_ABS specific event code generated by the axis.
 
       abs-range:
-        allOf:
-          - $ref: /schemas/types.yaml#/definitions/uint32-array
-          - items:
-              - description: minimum value
-              - description: maximum value
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - description: minimum value
+          - description: maximum value
         description: >
           Minimum and maximum values produced by the axis.
           For an ABS_X axis this will be the left-most and right-most

Documentation/devicetree/bindings/leds/cznic,turris-omnia-leds.yaml

···
 patternProperties:
   "^multi-led@[0-9a-b]$":
     type: object
-    allOf:
-      - $ref: leds-class-multicolor.yaml#
+    $ref: leds-class-multicolor.yaml#
     description:
       This node represents one of the RGB LED devices on Turris Omnia.
       No subnodes need to be added for subchannels since this controller only

Documentation/devicetree/bindings/leds/leds-lp50xx.yaml

···
 patternProperties:
   '^multi-led@[0-9a-f]$':
     type: object
-    allOf:
-      - $ref: leds-class-multicolor.yaml#
+    $ref: leds-class-multicolor.yaml#
     properties:
       reg:
         minItems: 1

Documentation/devicetree/bindings/mfd/google,cros-ec.yaml

···
     description:
       This property specifies the delay in usecs between the
       assertion of the CS and the first clock pulse.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - default: 0
-      - minimum: 0
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 0
 
   google,cros-ec-spi-msg-delay:
     description:
       This property specifies the delay in usecs between messages.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - default: 0
-      - minimum: 0
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 0
 
   google,has-vbc-nvram:
     description:

Documentation/devicetree/bindings/mtd/rockchip,nand-controller.yaml

···
 
       rockchip,boot-ecc-strength:
         enum: [16, 24, 40, 60, 70]
-        allOf:
-          - $ref: /schemas/types.yaml#/definitions/uint32
+        $ref: /schemas/types.yaml#/definitions/uint32
         description: |
           If specified it indicates that a different BCH/ECC setting is
           supported by the boot ROM.

Documentation/devicetree/bindings/net/ti,cpsw-switch.yaml

···
         type: object
         description: CPSW external ports
 
-        allOf:
-          - $ref: ethernet-controller.yaml#
+        $ref: ethernet-controller.yaml#
 
         properties:
           reg:

Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml

···
 
       connector:
         type: object
-        allOf:
-          - $ref: ../connector/usb-connector.yaml
+        $ref: /schemas/connector/usb-connector.yaml
         properties:
           vbus-supply: true
 

Documentation/devicetree/bindings/power/supply/sbs,sbs-manager.yaml

···
 patternProperties:
   "^i2c@[1-4]$":
     type: object
-
-    allOf:
-      - $ref: /schemas/i2c/i2c-controller.yaml#
+    $ref: /schemas/i2c/i2c-controller.yaml#
 
 examples:
   - |

Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml

···
       addresses. Cache and memory access settings are provided through a
       Memory Protection Unit (MPU), programmable only from the R5Fs.
 
-    allOf:
-      - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
+    $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
 
     properties:
       compatible:

Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml

···
       PRUSS INTC Node. Each PRUSS has a single interrupt controller instance
       that is common to all the PRU cores. This should be represented as an
       interrupt-controller node.
-
-    allOf:
-      - $ref: /schemas/interrupt-controller/ti,pruss-intc.yaml#
-
+    $ref: /schemas/interrupt-controller/ti,pruss-intc.yaml#
     type: object
 
   mdio@[a-f0-9]+$:
···
       MDIO Node. Each PRUSS has an MDIO module that can be used to control
       external PHYs. The MDIO module used within the PRU-ICSS is an instance of
       the MDIO Controller used in TI Davinci SoCs.
-
-    allOf:
-      - $ref: /schemas/net/ti,davinci-mdio.yaml#
-
+    $ref: /schemas/net/ti,davinci-mdio.yaml#
     type: object
 
   "^(pru|rtu|txpru)@[0-9a-f]+$":
···
       inactive by using the standard DT string property, "status". The ICSSG IP
       present on K3 SoCs have additional auxiliary PRU cores with slightly
       different IP integration.
-
-    allOf:
-      - $ref: /schemas/remoteproc/ti,pru-rproc.yaml#
-
+    $ref: /schemas/remoteproc/ti,pru-rproc.yaml#
     type: object
 
 required:

Documentation/devicetree/bindings/sound/st,stm32-sai.yaml

···
           By default, custom protocol is assumed, meaning that protocol is
           configured according to protocol defined in related DAI link node,
           such as i2s, left justified, right justified, dsp and pdm protocols.
-        allOf:
-          - $ref: /schemas/types.yaml#/definitions/flag
+        $ref: /schemas/types.yaml#/definitions/flag
 
       "#clock-cells":
         description: Configure the SAI device as master clock provider.

Documentation/devicetree/bindings/sound/tlv320adcx140.yaml

···
        4 - Drive weak low and active high
        5 - Drive Hi-Z and active high
 
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32-array
-      - minItems: 2
-        maxItems: 2
-        items:
-          maximum: 15
-        default: [2, 2]
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 2
+    items:
+      maximum: 15
+    default: [2, 2]
 
 required:
   - compatible

Documentation/devicetree/bindings/spi/spi-controller.yaml

···
 patternProperties:
   "^.*@[0-9a-f]+$":
     type: object
-
-    allOf:
-      - $ref: spi-peripheral-props.yaml
+    $ref: spi-peripheral-props.yaml
 
     required:
       - compatible

Documentation/devicetree/bindings/usb/st,stusb160x.yaml

···
 
   connector:
     type: object
-
-    allOf:
-      - $ref: ../connector/usb-connector.yaml
+    $ref: /schemas/connector/usb-connector.yaml#
 
     properties:
       compatible: