add compatible string for mt8189 dts node of disp-pwm

Signed-off-by: Jack Hsu <jh.hsu@mediatek.com>
Acked-by: Uwe Kleine-König <ukleinek@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>

---
Changs in v7:
 - update dt-bindings commit msg
   (use "mt8189" instead of "mt8189 evb board")

---
 Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml b/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
index 68ef30414325..22712769518b 100644
--- a/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
+++ b/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
@@ -30,6 +30,7 @@ properties:
               - mediatek,mt6893-disp-pwm
               - mediatek,mt8186-disp-pwm
               - mediatek,mt8188-disp-pwm
+              - mediatek,mt8189-disp-pwm
               - mediatek,mt8192-disp-pwm
               - mediatek,mt8195-disp-pwm
               - mediatek,mt8365-disp-pwm
-- 
2.45.2