arm64: dts: amlogic: gx: fix reference to unknown/untested PWM clock

Device-tree expects absent clocks to be specified as <0> (instead of
using <>). This fixes using the FCLK4/FCLK3 clocks as they are now
seen at their correct index (while before they were recognized, but at
the correct index - resulting in the hardware using a different clock
than what the kernel sees).

Fixes: a526eee ("arm64: dts: amlogic: gx: switch to the new PWM controller binding")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250420164801.330505-4-martin.blumenstingl@googlemail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

Author: xdarklight

arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi

@@ -741,7 +741,7 @@
 
 &pwm_ab {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };
@@ -752,14 +752,14 @@
 
 &pwm_cd {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };
 
 &pwm_ef {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };

arch/arm64/boot/dts/amlogic/meson-gxl.dtsi

@@ -811,7 +811,7 @@
 
 &pwm_ab {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };
@@ -822,14 +822,14 @@
 
 &pwm_cd {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };
 
 &pwm_ef {
 	clocks = <&xtal>,
-		 <>, /* unknown/untested, the datasheet calls it "vid_pll" */
+		 <0>, /* unknown/untested, the datasheet calls it "vid_pll" */
 		 <&clkc CLKID_FCLK_DIV4>,
 		 <&clkc CLKID_FCLK_DIV3>;
 };