arm: mach-k3: j721s2_init: Initialize AVS Class 0

Adaptive Voltage Scaling (AVS) Class 0 is a procedure for lowering the
voltage on certain device power rails. Initialize AVS Class 0.

Link: https://www.ti.com/lit/pdf/spruj28 (Section 5.2.3.3.2.5 AVS-Class0)
Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>
Reviewed-by: Aniket Limaye <a-limaye@ti.com>

arch/arm/mach-k3/j721s2/j721s2_init.c

@@ -315,6 +315,9 @@ void do_dt_magic(void)
 #ifdef CONFIG_SPL_BUILD
 void board_init_f(ulong dummy)
 {
+	struct udevice *dev;
+	int ret;
+
 	k3_spl_init();
 #if defined(CONFIG_SPL_OF_LIST) && defined(CONFIG_TI_I2C_BOARD_DETECT)
 	do_dt_magic();
@@ -325,6 +328,13 @@ void board_init_f(ulong dummy)
 		setup_navss_nb();
 
 	setup_qos();
+
+	if (IS_ENABLED(CONFIG_CPU_V7R) && IS_ENABLED(CONFIG_K3_AVS0)) {
+		ret = uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(k3_avs),
+						  &dev);
+		if (ret)
+			printf("AVS init failed: %d\n", ret);
+	}
 }
 #endif