dts: bindings: Define a bus for the axp192/axp2101.

Define a bus to show the dependencies of each function
on the AXP192/AXP2101 MFD.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

dts/bindings/charger/x-powers,axp2101-charger.yaml

@@ -23,6 +23,8 @@ description: |
 
 compatible: "x-powers,axp2101-charger"
 
+on-bus: axp2101
+
 include:
   - base.yaml
   - battery.yaml

dts/bindings/gpio/x-powers,axp192-gpio.yaml

@@ -18,6 +18,8 @@ compatible: "x-powers,axp192-gpio"
 
 include: gpio-controller.yaml
 
+on-bus: axp192
+
 properties:
   "#gpio-cells":
     const: 2

dts/bindings/mfd/x-powers,axp192.yaml

@@ -7,6 +7,8 @@ compatible: "x-powers,axp192"
 
 include: i2c-device.yaml
 
+bus: axp192
+
 properties:
   reg:
     required: true

dts/bindings/mfd/x-powers,axp2101.yaml

@@ -7,6 +7,8 @@ compatible: "x-powers,axp2101"
 
 include: i2c-device.yaml
 
+bus: axp2101
+
 properties:
   reg:
     required: true

dts/bindings/regulator/x-powers,axp192-regulator.yaml

@@ -40,6 +40,8 @@ description: |
 
 compatible: "x-powers,axp192-regulator"
 
+on-bus: axp192
+
 include: base.yaml
 
 child-binding:

dts/bindings/regulator/x-powers,axp2101-regulator.yaml

@@ -67,6 +67,8 @@ compatible: "x-powers,axp2101-regulator"
 
 include: base.yaml
 
+on-bus: axp2101
+
 child-binding:
   include:
     - name: regulator.yaml