arm64: dts: ti: k3-am64-main: Switch ICSSG clock to core clock

ICSSG has 7 available clocks per instance. Add all the cloks to ICSSG
nodes. ICSSG currently uses ICSSG_ICLK (clk id 20) which operates at
250MHz. Switch ICSSG clock to ICSSG_CORE clock (clk id 0) which operates at
333MHz.

ICSSG_CORE clock will help get the most out of ICSSG as more cycles are
needed to fully support all ICSSG features.

This commit also changes assigned-clock-parents of coreclk-mux to
ICSSG_CORE clock from ICSSG_ICLK.

Performance update in dual mac mode
  With ICSSG_CORE Clk @ 333MHz
    Tx throughput - 934 Mbps
    Rx throughput - 914 Mbps,

  With ICSSG_ICLK clk @ 250MHz,
    Tx throughput - 920 Mbps
    Rx throughput - 706 Mbps

Signed-off-by: MD Danish Anwar <[email protected]>
Tested-by: Wadim Egorov <[email protected]>
Reviewed-by: Roger Quadros <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Nishanth Menon <[email protected]>

Author: danish-ti

arch/arm64/boot/dts/ti/k3-am64-main.dtsi

@@ -1227,6 +1227,15 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x00 0x30000000 0x80000>;
+		clocks = <&k3_clks 81 0>,  /* icssg0_core_clk */
+			 <&k3_clks 81 3>,  /* icssg0_iep_clk */
+			 <&k3_clks 81 16>, /* icssg0_rgmii_mhz_250_clk */
+			 <&k3_clks 81 17>, /* icssg0_rgmii_mhz_50_clk */
+			 <&k3_clks 81 18>, /* icssg0_rgmii_mhz_5_clk */
+			 <&k3_clks 81 19>, /* icssg0_uart_clk */
+			 <&k3_clks 81 20>; /* icssg0_iclk */
+		assigned-clocks = <&k3_clks 81 0>;
+		assigned-clock-parents = <&k3_clks 81 2>;
 
 		icssg0_mem: memories@0 {
 			reg = <0x0 0x2000>,
@@ -1252,7 +1261,7 @@
 					clocks = <&k3_clks 81 0>,  /* icssg0_core_clk */
 						 <&k3_clks 81 20>; /* icssg0_iclk */
 					assigned-clocks = <&icssg0_coreclk_mux>;
-					assigned-clock-parents = <&k3_clks 81 20>;
+					assigned-clock-parents = <&k3_clks 81 0>;
 				};
 
 				icssg0_iepclk_mux: iepclk-mux@30 {
@@ -1397,6 +1406,15 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x00 0x30080000 0x80000>;
+		clocks = <&k3_clks 82 0>,  /* icssg1_core_clk */
+			 <&k3_clks 82 3>,  /* icssg1_iep_clk */
+			 <&k3_clks 82 16>, /* icssg1_rgmii_mhz_250_clk */
+			 <&k3_clks 82 17>, /* icssg1_rgmii_mhz_50_clk */
+			 <&k3_clks 82 18>, /* icssg1_rgmii_mhz_5_clk */
+			 <&k3_clks 82 19>, /* icssg1_uart_clk */
+			 <&k3_clks 82 20>; /* icssg1_iclk */
+		assigned-clocks = <&k3_clks 82 0>;
+		assigned-clock-parents = <&k3_clks 82 2>;
 
 		icssg1_mem: memories@0 {
 			reg = <0x0 0x2000>,
@@ -1422,7 +1440,7 @@
 					clocks = <&k3_clks 82 0>,   /* icssg1_core_clk */
 						 <&k3_clks 82 20>;  /* icssg1_iclk */
 					assigned-clocks = <&icssg1_coreclk_mux>;
-					assigned-clock-parents = <&k3_clks 82 20>;
+					assigned-clock-parents = <&k3_clks 82 0>;
 				};
 
 				icssg1_iepclk_mux: iepclk-mux@30 {