ARC: [plat-axs10x] DTS: Add reset controller node to manage ethernet reset

DW ethernet controller on axs10x hangs sometimes after SW reset.
Invoke the newly aded driver (reset-axs10x.c) by adding the DT bits.

With this in place, we don't need the open-coded quirk in platform
code, so get rid of it as well !
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/boot/dts/axs10x_mb.dtsi

@@ -16,6 +16,12 @@ axs10x_mb {
 		ranges = <0x00000000 0x0 0xe0000000 0x10000000>;
 		interrupt-parent = <&mb_intc>;
 
+		creg_rst: reset-controller@11220 {
+			compatible = "snps,axs10x-reset";
+			#reset-cells = <1>;
+			reg = <0x11220 0x4>;
+		};
+
 		i2sclk: i2sclk@100a0 {
 			compatible = "snps,axs10x-i2s-pll-clock";
 			reg = <0x100a0 0x10>;
@@ -73,6 +79,8 @@ ethernet@0x18000 {
 			clocks = <&apbclk>;
 			clock-names = "stmmaceth";
 			max-speed = <100>;
+			resets = <&creg_rst 5>;
+			reset-names = "stmmaceth";
 		};
 
 		ehci@0x40000 {

arch/arc/plat-axs10x/axs10x.c

@@ -111,13 +111,6 @@ static void __init axs10x_early_init(void)
 
 	axs10x_enable_gpio_intc_wire();
 
-	/*
-	 * Reset ethernet IP core.
-	 * TODO: get rid of this quirk after axs10x reset driver (or simple
-	 * reset driver) will be available in upstream.
-	 */
-	iowrite32((1 << 5), (void __iomem *) CREG_MB_SW_RESET);
-
 	scnprintf(mb, 32, "MainBoard v%d", mb_rev);
 	axs10x_print_board_ver(CREG_MB_VER, mb);
 }