Merge patch series "board: ti: Add 32k crystal initialization"

Vishal Mahaveer <vishalm@ti.com> says:

Add 32k crystal initialization support for am62x, am62ax and am62px TI boards.

Link: https://lore.kernel.org/r/20260121195340.3041549-1-vishalm@ti.com

board/ti/am62ax/evm.c

@@ -15,6 +15,7 @@
 #include <asm/arch/k3-ddr.h>
 
 #include "../common/fdt_ops.h"
+#include "../common/k3_32k_lfosc.h"
 
 #if defined(CONFIG_XPL_BUILD)
 void spl_perform_board_fixups(struct spl_image_info *spl_image)
@@ -26,6 +27,12 @@ void spl_perform_board_fixups(struct spl_image_info *spl_image)
 		fixup_memory_node(spl_image);
 	}
 }
+
+void spl_board_init(void)
+{
+	if (IS_ENABLED(CONFIG_TI_K3_BOARD_LFOSC))
+		enable_32k_lfosc();
+}
 #endif
 
 #ifdef CONFIG_BOARD_LATE_INIT

board/ti/am62dx/evm.c

@@ -15,6 +15,7 @@
 #include <asm/arch/k3-ddr.h>
 
 #include "../common/fdt_ops.h"
+#include "../common/k3_32k_lfosc.h"
 
 #if defined(CONFIG_XPL_BUILD)
 void spl_perform_board_fixups(struct spl_image_info *spl_image)
@@ -26,6 +27,12 @@ void spl_perform_board_fixups(struct spl_image_info *spl_image)
 		fixup_memory_node(spl_image);
 	}
 }
+
+void spl_board_init(void)
+{
+	if (IS_ENABLED(CONFIG_TI_K3_BOARD_LFOSC))
+		enable_32k_lfosc();
+}
 #endif
 
 #ifdef CONFIG_BOARD_LATE_INIT

board/ti/am62px/evm.c

@@ -16,6 +16,7 @@
 #include <spl.h>
 #include <asm/arch/k3-ddr.h>
 #include "../common/fdt_ops.h"
+#include "../common/k3_32k_lfosc.h"
 
 struct efi_fw_image fw_images[] = {
 	{
@@ -45,6 +46,9 @@ struct efi_capsule_update_info update_info = {
 #if IS_ENABLED(CONFIG_SPL_BUILD)
 void spl_board_init(void)
 {
+	if (IS_ENABLED(CONFIG_TI_K3_BOARD_LFOSC))
+		enable_32k_lfosc();
+
 	enable_caches();
 }
 #endif

board/ti/am62x/evm.c

@@ -24,6 +24,7 @@
 
 #include "../common/board_detect.h"
 #include "../common/fdt_ops.h"
+#include "../common/k3_32k_lfosc.h"
 
 #define board_is_am62x_skevm()  (board_ti_k3_is("AM62-SKEVM") || \
 				 board_ti_k3_is("AM62B-SKEVM"))
@@ -139,6 +140,9 @@ int board_late_init(void)
 #if defined(CONFIG_XPL_BUILD)
 void spl_board_init(void)
 {
+	if (IS_ENABLED(CONFIG_TI_K3_BOARD_LFOSC))
+		enable_32k_lfosc();
+
 	enable_caches();
 	if (IS_ENABLED(CONFIG_SPL_SPLASH_SCREEN) && IS_ENABLED(CONFIG_SPL_BMP))
 		splash_display();

board/ti/common/Kconfig

@@ -22,6 +22,11 @@ config CAPE_EEPROM_BUS_NUM
 	default 2
 	depends on SUPPORT_EXTENSION_SCAN
 
+config TI_K3_BOARD_LFOSC
+	bool "Initialize 32k LFOSC"
+	help
+	  Enable the 32k LFOSC on the device
+
 config TI_COMMON_CMD_OPTIONS
 	bool "Enable cmd options on TI platforms"
 	imply CMD_ASKENV

board/ti/common/Makefile

@@ -5,3 +5,4 @@ obj-${CONFIG_TI_I2C_BOARD_DETECT} += board_detect.o
 obj-${CONFIG_$(PHASE_)SUPPORT_EXTENSION_SCAN} += cape_detect.o
 obj-${CONFIG_OF_LIBFDT} += fdt_ops.o
 obj-${CONFIG_ARCH_K3} += k3-ddr.o
+obj-${CONFIG_TI_K3_BOARD_LFOSC} += k3_32k_lfosc.o

board/ti/common/k3_32k_lfosc.c

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Library to support LFOSC operations common to some of the K3 devices
+ *
+ * Copyright (C) 2026 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include <asm/arch/hardware.h>
+
+void enable_32k_lfosc(void)
+{
+	u32 val;
+
+	/* We have 32k crystal, so lets enable it */
+	val = readl(MCU_CTRL_LFXOSC_CTRL);
+	val &= ~(MCU_CTRL_LFXOSC_32K_DISABLE_VAL);
+	writel(val, MCU_CTRL_LFXOSC_CTRL);
+	/* Add any TRIM needed for the crystal here.. */
+	/* Make sure to mux up to take the SoC 32k from the crystal */
+	writel(MCU_CTRL_DEVICE_CLKOUT_LFOSC_SELECT_VAL,
+	       MCU_CTRL_DEVICE_CLKOUT_32K_CTRL);
+}

board/ti/common/k3_32k_lfosc.h

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Library to support LFOSC operations common to some of the K3 devices
+ *
+ * Copyright (C) 2026 Texas Instruments Incorporated - https://www.ti.com/
+ */
+#ifndef __32K_LFOSC_OPS_H
+#define __32K_LFOSC_OPS_H
+
+/**
+ * enable_32k_lfosc - Do basic initialization of the 32k crystal
+ */
+void enable_32k_lfosc(void);
+
+#endif /* __32K_LFOSC_OPS_H */

configs/am62ax_evm_r5_defconfig

@@ -103,3 +103,5 @@ CONFIG_SPL_TIMER=y
 CONFIG_OMAP_TIMER=y
 CONFIG_LIB_RATIONAL=y
 CONFIG_SPL_LIB_RATIONAL=y
+CONFIG_SPL_BOARD_INIT=y
+CONFIG_TI_K3_BOARD_LFOSC=y

configs/am62px_evm_r5_defconfig

@@ -122,3 +122,5 @@ CONFIG_SPL_TIMER=y
 CONFIG_OMAP_TIMER=y
 CONFIG_LIB_RATIONAL=y
 CONFIG_SPL_LIB_RATIONAL=y
+CONFIG_SPL_BOARD_INIT=y
+CONFIG_TI_K3_BOARD_LFOSC=y

configs/am62x_evm_r5_defconfig

@@ -119,3 +119,5 @@ CONFIG_SPL_TIMER=y
 CONFIG_OMAP_TIMER=y
 CONFIG_LIB_RATIONAL=y
 CONFIG_SPL_LIB_RATIONAL=y
+CONFIG_SPL_BOARD_INIT=y
+CONFIG_TI_K3_BOARD_LFOSC=y