[PATCH dt-schema 3/3] schemas: i2c: add generic interrupt name for I2C controllers

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"smbus_alert" is a generic interrupt name for controllers, so document
it. Introduce also "irq" for the primary interrupt.

Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
 dtschema/schemas/i2c/i2c-controller.yaml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/dtschema/schemas/i2c/i2c-controller.yaml b/dtschema/schemas/i2c/i2c-controller.yaml
index 7eb6b0f..da277a2 100644
--- a/dtschema/schemas/i2c/i2c-controller.yaml
+++ b/dtschema/schemas/i2c/i2c-controller.yaml
@@ -90,6 +90,22 @@ properties:
       low-pass analog filter). Typical value should be above the normal i2c bus
       clock frequency (clock-frequency). Specified in Hz.
 
+  interrupts:
+    description:
+      If not using interrupt-names, the first interrupt will be treated as the
+      primary interrupt for the controller.
+
+  interrupt-names:
+    anyOf:
+      - {} # Any name is allowed.
+      - items:
+          enum:
+            - irq
+            - smbus_alert
+        description:
+          Generic names are "irq" for a primary interrupt and "smbus_alert" for
+          the SMBusAlert signal. Other names are left to individual bindings.
+
   mctp-controller:
     type: boolean
     description:
-- 
2.43.0





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