[][pwm add mt7981 support]

[Description]
Add PWM dts node, remove PWM clock from clkitg, modify PWM drivers for REG-V2.

[Release-log]
N/A

Change-Id: If007b311f77d9a2fa4be26199b63ff384d0218c0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5381846
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
index 083a723..9b40b37 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
@@ -29,13 +29,13 @@
 			<&infracfg CK_INFRA_ISPI0>,
 			<&infracfg CK_INFRA_I2C>,
 			<&infracfg CK_INFRA_ISPI1>,
-			<&infracfg CK_INFRA_PWM>,
+			<&clk40m>,
 			<&infracfg CK_INFRA_66M_MCK>,
 			<&infracfg CK_INFRA_CK_F32K>,
 			<&clk40m>,
+			<&clk40m>,
+			<&clk40m>,
-			<&infracfg CK_INFRA_PWM_BCK>,
-			<&infracfg CK_INFRA_PWM_CK1>,
-			<&infracfg CK_INFRA_PWM_CK2>,
+			<&clk40m>,
 			<&infracfg CK_INFRA_133M_HCK>,
 			<&infracfg CK_INFRA_66M_PHCK>,
 			<&infracfg CK_INFRA_FAUD_L_CK	>,
@@ -64,15 +64,15 @@
 			<&infracfg_ao CK_INFRA_UART2_SEL>,
 			<&infracfg_ao CK_INFRA_SPI0_SEL>,
 			<&infracfg_ao CK_INFRA_SPI1_SEL>,
-			<&infracfg_ao CK_INFRA_PWM1_SEL>,
-			<&infracfg_ao CK_INFRA_PWM2_SEL>,
-			<&infracfg_ao CK_INFRA_PWM_BSEL>,
+			<&clk40m>,
+			<&clk40m>,
+			<&clk40m>,
 			<&clk40m>,
 			<&infracfg_ao CK_INFRA_GPT_STA>,
-			<&infracfg_ao CK_INFRA_PWM_HCK>,
-			<&infracfg_ao CK_INFRA_PWM_STA>,
-			<&infracfg_ao CK_INFRA_PWM1_CK>,
-			<&infracfg_ao CK_INFRA_PWM2_CK>,
+			<&clk40m>,
+			<&clk40m>,
+			<&clk40m>,
+			<&clk40m>,
 			<&infracfg_ao CK_INFRA_CQ_DMA_CK>,
 			<&clk40m>,
 			<&clk40m>,
@@ -165,7 +165,7 @@
 			<&clk40m>,
 			<&clk40m>,
 			<&topckgen CK_TOP_UART_SEL>,
-			<&topckgen CK_TOP_PWM_SEL>,
+			<&clk40m>,
 			<&topckgen CK_TOP_I2C_SEL>,
 			<&clk40m>,
 			<&topckgen CK_TOP_EMMC_208M_SEL	>,