Modify arch/arm/boot/dts/amlogic/kvim3.dts?

I am using android9-32bit with VIM3 and i want to modify arch/arm/boot/dts/amlogic/kvim3.dts to enable pwm_f. My queston is:
could anyone help me how can i modify arch/arm/boot/dts/amlogic/kvim3.dts?

Hello @A.M.T

@xiong.zhang will help you next week.

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Modify as follows

xiong@server:/users/xiong/work/amlogic/vim3/vim3_32bit/common$ git diff
diff --git a/arch/arm/boot/dts/amlogic/kvim3.dts b/arch/arm/boot/dts/amlogic/kvim3.dts
index 5ddbbb205ae8..a86d831e15f2 100644
--- a/arch/arm/boot/dts/amlogic/kvim3.dts
+++ b/arch/arm/boot/dts/amlogic/kvim3.dts
@@ -834,6 +834,8 @@
 
 &pwm_ef {
                status = "okay";
+               pinctrl-names = "default";
+               pinctrl-0 = <&pwm_f_pins2>;
        };
 
 &pwm_AO_cd {
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