[PATCH 1/2] dt-bindings: mfd: mediatek: mt6397: describe the RTC's 32 kHz output

[Ryan Brue]

The MT6397 RTC drives its 32 kHz clock out of the PMIC, where boards
use it as the sleep clock of a Wi-Fi/Bluetooth combo chip. The output
is off unless something turns it on.

Let the RTC node provide it as a clock.

Signed-off-by: Ryan Brue <ryanbrue.dev@xxxxxxxxx>
---
 Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
index 055625362951..3bfe1ad60d2d 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
@@ -84,6 +84,11 @@ properties:
 
       start-year: true
 
+      "#clock-cells":
+        description:
+          The 32 kHz clock the RTC drives out to other chips.
+        const: 0
+
       nvmem-layout:
         $ref: /schemas/nvmem/layouts/nvmem-layout.yaml
         description:
@@ -694,5 +699,6 @@ examples:
 
         rtc {
             compatible = "mediatek,mt6397-rtc";
+            #clock-cells = <0>;
         };
     };

-- 
2.55.0