[RESEND PATCH v1 3/5] dt-bindings: Add depends-on property

From: Saravana Kannan
Date: Mon Jun 03 2019 - 20:36:27 EST

The depends-on property is used to list the mandatory functional
dependencies of a consumer device on zero or more supplier devices.

Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
.../devicetree/bindings/depends-on.txt | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)
create mode 100644 Documentation/devicetree/bindings/depends-on.txt

diff --git a/Documentation/devicetree/bindings/depends-on.txt b/Documentation/devicetree/bindings/depends-on.txt
new file mode 100644
index 000000000000..1cbddd11cf17
--- /dev/null
+++ b/Documentation/devicetree/bindings/depends-on.txt
@@ -0,0 +1,26 @@
+Functional dependency linking
+Apart from parent-child relationships, devices (consumers) often have
+functional dependencies on other devices (suppliers). Common examples of
+suppliers are clock, regulators, pinctrl, etc. However not all of them are
+dependencies with well defined devicetree bindings. Also, not all functional
+dependencies are mandatory as the device might be able to operate in a limited
+mode without some of the dependencies.
+The depends-on property allows marking these mandatory functional dependencies
+between one or more devices. The depends-on property is used by the consumer
+device to point to all its mandatory supplier devices.
+Optional properties:
+- depends-on: A list of phandles to mandatory suppliers of the device.
+Here, the device is dependent on only 2 of the 3 clock providers
+dev@40031000 {
+ compatible = "name";
+ reg = <0x40031000 0x1000>;
+ clocks = <&osc_1 1>, <&osc_2 7> <&osc_3 5>;
+ depends-on = <&osc_1>, <&osc_3>;