[PATCH v3 1/3] dt-bindings: serial: amlogic,meson-uart: Add compatible string for G12A

[Martin Blumenstingl]

Amlogic G12A SoCs gained a new "divide XTAL by 2" bit. Everything else
(we know about) is identical to the UART IP on GX (GXBB/GXL/GXM) SoCs.
Add a new compatible string for this SoC so this new bit can be managed
accordingly while keeping "amlogic,meson-gx-uart" as fallback compatible
string.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
---
Changes from v1 -> v2:
- make meson-gx-uart a valid compatible string for meson-g12a-uart

Changes from v2 -> v3:
- don't add extra oneOf as all of the entries are enclosed in oneOf
  already
- don't allow amlogic,meson-g12a-uart as standalone compatible string
  (which slipped through in v2 due to all of the formatting changes
  that the extra oneOf required)


 .../devicetree/bindings/serial/amlogic,meson-uart.yaml   | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
index 3cbdde85ed71..22656efe8ddc 100644
--- a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
@@ -34,6 +34,11 @@ properties:
               - amlogic,meson-gx-uart
               - amlogic,meson-s4-uart
           - const: amlogic,meson-ao-uart
+      - description: Always-on power domain UART controller on G12A SoCs
+        items:
+          - const: amlogic,meson-g12a-uart
+          - const: amlogic,meson-gx-uart
+          - const: amlogic,meson-ao-uart
       - description: Everything-Else power domain UART controller
         enum:
           - amlogic,meson6-uart
@@ -41,6 +46,10 @@ properties:
           - amlogic,meson8b-uart
           - amlogic,meson-gx-uart
           - amlogic,meson-s4-uart
+      - description: Everything-Else power domain UART controller on G12A SoCs
+        items:
+          - const: amlogic,meson-g12a-uart
+          - const: amlogic,meson-gx-uart
 
   reg:
     maxItems: 1
-- 
2.39.2