[Samsung Galaxy Watch 4] adfree:
Btw...

IMHO also other ways possible to reach this option... with ADB maybe...

/*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/gpio.h>
#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/input.h>
#endif
#include <linux/sec_ext.h>
#include "./debug/sec_debug_internal.h"
#include "../battery_v2/include/sec_charging_common.h"
#include <linux/sec_batt.h>

#include <asm/cacheflush.h>
#include <asm/system_misc.h>

#include <linux/reset/exynos-reset.h>
#include <soc/samsung/exynos-pmu.h>
#include <soc/samsung/acpm_ipc_ctrl.h>
#include <linux/battery/sec_charging_common.h>
#include <linux/notifier.h>
#include <linux/string.h>
//#include <soc/samsung/exynos-sci.h>

#if defined(CONFIG_SEC_ABC)
#include <linux/sti/abc_common.h>
#endif
#if IS_ENABLED(CONFIG_SEC_PARAM)
extern unsigned int lpcharge;
#endif

extern void hard_reset_delay(void);

/* MULTICMD
* reserve 8bit | dumpsink_sel 1bit | clk_change 1bit | dumpsink 2bit | param 1bit | dram_test 1bit | cp_debugmem 2bit | debuglevel 2bit | forceupload 2bit
*/
#define FORCEUPLOAD_ON (0x5)
#define FORCEUPLOAD_OFF (0x0)
#define DEBUGLEVEL_LOW (0x4f4c)
#define DEBUGLEVEL_MID (0x494d)
#define DEBUGLEVEL_HIGH (0x4948)
#define DUMPSINK_USB (0x0)
#define DUMPSINK_BOOTDEV (0x42544456)
#define DUMPSINK_SDCARD (0x73646364)
#define DUMPSINK_SELECT (0x65254478)
#define MULTICMD_CNT_MAX 10
#define MULTICMD_LEN_MAX 50
#define MULTICMD_FORCEUPLOAD_SHIFT 0
#define MULTICMD_FORCEUPLOAD_ON (0x1)
#define MULTICMD_FORCEUPLOAD_OFF (0x2)
#define MULTICMD_DEBUGLEVEL_SHIFT (MULTICMD_FORCEUPLOAD_SHIFT + 2)
#define MULTICMD_DEBUGLEVEL_LOW (0x1)
#define MULTICMD_DEBUGLEVEL_MID (0x2)
#define MULTICMD_DEBUGLEVEL_HIGH (0x3)
#define MULTICMD_CPMEM_SHIFT (MULTICMD_DEBUGLEVEL_SHIFT + 2)
#define MULTICMD_CPMEM_ON (0x1)
#define MULTICMD_CPMEM_OFF (0x2)
#define MULTICMD_DRAMTEST_SHIFT (MULTICMD_CPMEM_SHIFT + 2)
#define MULTICMD_DRAMTEST_ON (0x1)
#define MULTICMD_PARAM_SHIFT (MULTICMD_DRAMTEST_SHIFT + 1)
#define MULTICMD_PARAM_ON (0x1)
#define MULTICMD_DUMPSINK_SHIFT (MULTICMD_PARAM_SHIFT + 1)
#define MULTICMD_DUMPSINK_USB (0x1)
#define MULTICMD_DUMPSINK_BOOT (0x2)
#define MULTICMD_DUMPSINK_SD (0x3)
#define MULTICMD_CLKCHANGE_SHIFT (MULTICMD_DUMPSINK_SHIFT + 2)
#define MULTICMD_CLKCHANGE_ON (0x1)
#define MULTICMD_DUMPSINK_SEL_SHIFT (MULTICMD_CLKCHANGE_SHIFT + 1)
#define MULTICMD_DUMPSINK_SEL (0x1)

extern void cache_flush_all(void);
extern void exynos_mach_restart(const char *cmd);
extern struct atomic_notifier_head panic_notifier_list;
extern struct exynos_reboot_helper_ops exynos_reboot_ops;
extern int exynos_reboot_pwrkey_status(void);

/* MINFORM */
#define SEC_REBOOT_START_OFFSET (24)
#define SEC_REBOOT_END_OFFSET (16)

enum sec_power_flags {
SEC_REBOOT_DEFAULT = 0x30,
SEC_REBOOT_NORMAL = 0x4E,
SEC_REBOOT_LPM = 0x70,
};

#define SEC_DUMPSINK_MASK 0x0000FFFF

/* PANIC INFORM */
#define SEC_RESET_REASON_PREFIX 0x12345600
#define SEC_RESET_SET_PREFIX 0xabc00000
#define SEC_RESET_MULTICMD_PREFIX 0xa5600000
enum sec_reset_reason {
SEC_RESET_REASON_UNKNOWN = (SEC_RESET_REASON_PREFIX | 0x00),
SEC_RESET_REASON_DOWNLOAD = (SEC_RESET_REASON_PREFIX | 0x01),
SEC_RESET_REASON_UPLOAD = (SEC_RESET_REASON_PREFIX | 0x02),
SEC_RESET_REASON_CHARGING = (SEC_RESET_REASON_PREFIX | 0x03),
SEC_RESET_REASON_RECOVERY = (SEC_RESET_REASON_PREFIX | 0x04),
SEC_RESET_REASON_FOTA = (SEC_RESET_REASON_PREFIX | 0x05),
SEC_RESET_REASON_FOTA_BL = (SEC_RESET_REASON_PREFIX | 0x06), /* update bootloader */
SEC_RESET_REASON_SECURE = (SEC_RESET_REASON_PREFIX | 0x07), /* image secure check fail */
SEC_RESET_REASON_FWUP = (SEC_RESET_REASON_PREFIX | 0x09), /* emergency firmware update */
SEC_RESET_REASON_EM_FUSE = (SEC_RESET_REASON_PREFIX | 0x0a), /* EMC market fuse */
SEC_RESET_REASON_FACTORY = (SEC_RESET_REASON_PREFIX | 0x0c), /* go to factory mode */
SEC_RESET_REASON_BOOTLOADER = (SEC_RESET_REASON_PREFIX | 0x0d), /* go to download mode */
SEC_RESET_REASON_WIRELESSD_BL = (SEC_RESET_REASON_PREFIX | 0x0e), /* go to wireless download BOTA mode */
SEC_RESET_REASON_RECOVERY_WD = (SEC_RESET_REASON_PREFIX | 0x0f), /* go to wireless download mode */
SEC_RESET_REASON_PKEY_HOLD = (SEC_RESET_REASON_PREFIX | 0x12), /* Power Key HOLD during shutdown */
SEC_RESET_REASON_EMERGENCY = 0x0,

SEC_RESET_SET_DPRM = (SEC_RESET_SET_PREFIX | 0x20000),
SEC_RESET_SET_FORCE_UPLOAD = (SEC_RESET_SET_PREFIX | 0x40000),
SEC_RESET_SET_DEBUG = (SEC_RESET_SET_PREFIX | 0xd0000),
SEC_RESET_SET_SWSEL = (SEC_RESET_SET_PREFIX | 0xe0000),
SEC_RESET_SET_SUD = (SEC_RESET_SET_PREFIX | 0xf0000),
SEC_RESET_CP_DBGMEM = (SEC_RESET_SET_PREFIX | 0x50000), /* cpmem_on: CP RAM logging */
SEC_RESET_SET_POWEROFF_WATCH = (SEC_RESET_SET_PREFIX | 0x90000), /* Power off Watch mode */
#if defined(CONFIG_SEC_ABC)
SEC_RESET_USER_DRAM_TEST = (SEC_RESET_SET_PREFIX | 0x60000), /* USER DRAM TEST */
#endif
#if defined(CONFIG_SEC_SYSUP)
SEC_RESET_SET_PARAM = (SEC_RESET_SET_PREFIX | 0x70000),
#endif
SEC_RESET_SET_DUMPSINK = (SEC_RESET_SET_PREFIX | 0x80000),
SEC_RESET_SET_MULTICMD = SEC_RESET_MULTICMD_PREFIX,
};

static int sec_reboot_on_panic;
static char panic_str[10] = "panic";

ATOMIC_NOTIFIER_HEAD(sec_power_off_notifier_list);
EXPORT_SYMBOL(sec_power_off_notifier_list);

static char * sec_strtok(char *s1, const char *delimit)
{
static char *lastToken = NULL;
char *tmp;

if (s1 == NULL) {
s1 = lastToken;

if (s1 == NULL)
return NULL;
} else {
s1 += strspn(s1, delimit);
}

tmp = strpbrk(s1, delimit);
if (tmp) {
*tmp = '\0';
lastToken = tmp + 1;
} else {
lastToken = NULL;
}

return s1;
}

static void sec_multicmd(const char *cmd)
{
unsigned long value = 0;
char *multicmd_ptr;
char *multicmd_cmd[MULTICMD_CNT_MAX];
char copy_cmd[100] = {0,};
unsigned long multicmd_value = 0;
int i, cnt = 0;

strcpy(copy_cmd, cmd);
multicmd_ptr = sec_strtok(copy_cmd, ":");
while (multicmd_ptr != NULL) {
if (cnt >= MULTICMD_CNT_MAX)
break;

multicmd_cmd[cnt++] = multicmd_ptr;
multicmd_ptr = sec_strtok(NULL, ":");
}

for (i = 1; i < cnt; i++) {
if (strlen(multicmd_cmd[i]) < MULTICMD_LEN_MAX) {
if (!strncmp(multicmd_cmd[i], "forceupload", 11) && !kstrtoul(multicmd_cmd[i] + 11, 0, &value)) {
if (value == FORCEUPLOAD_ON)
multicmd_value |= (MULTICMD_FORCEUPLOAD_ON << MULTICMD_FORCEUPLOAD_SHIFT);
else if (value == FORCEUPLOAD_OFF)
multicmd_value |= (MULTICMD_FORCEUPLOAD_OFF << MULTICMD_FORCEUPLOAD_SHIFT);
}
else if (!strncmp(multicmd_cmd[i], "debug", 5) && !kstrtoul(multicmd_cmd[i] + 5, 0, &value)) {
if (value == DEBUGLEVEL_HIGH)
multicmd_value |= (MULTICMD_DEBUGLEVEL_HIGH << MULTICMD_DEBUGLEVEL_SHIFT);
else if (value == DEBUGLEVEL_MID)
multicmd_value |= (MULTICMD_DEBUGLEVEL_MID << MULTICMD_DEBUGLEVEL_SHIFT);
else if (value == DEBUGLEVEL_LOW)
multicmd_value |= (MULTICMD_DEBUGLEVEL_LOW << MULTICMD_DEBUGLEVEL_SHIFT);
}
else if (!strncmp(multicmd_cmd[i], "cpmem_on", 8))
multicmd_value |= (MULTICMD_CPMEM_ON << MULTICMD_CPMEM_SHIFT);
else if (!strncmp(multicmd_cmd[i], "cpmem_off", 9))
multicmd_value |= (MULTICMD_CPMEM_OFF << MULTICMD_CPMEM_SHIFT);
#if defined(CONFIG_SEC_ABC)
else if (!strncmp(multicmd_cmd[i], "user_dram_test", 14) && sec_abc_get_enabled())
multicmd_value |= (MULTICMD_DRAMTEST_ON << MULTICMD_DRAMTEST_SHIFT);
#endif
#if defined(CONFIG_SEC_SYSUP)
else if (!strncmp(multicmd_cmd[i], "param", 5))
multicmd_value |= (MULTICMD_PARAM_ON << MULTICMD_PARAM_SHIFT);
#endif
else if (!strncmp(multicmd_cmd[i], "dump_sink", 9) && !kstrtoul(multicmd_cmd[i] + 9, 0, &value)) {
if (value == DUMPSINK_USB)
multicmd_value |= (MULTICMD_DUMPSINK_USB << MULTICMD_DUMPSINK_SHIFT);
else if (value == DUMPSINK_BOOTDEV)
multicmd_value |= (MULTICMD_DUMPSINK_BOOT << MULTICMD_DUMPSINK_SHIFT);
else if (value == DUMPSINK_SDCARD)
multicmd_value |= (MULTICMD_DUMPSINK_SD << MULTICMD_DUMPSINK_SHIFT);
else if (value == DUMPSINK_SELECT)
multicmd_value |= (MULTICMD_DUMPSINK_SEL << MULTICMD_DUMPSINK_SEL_SHIFT);
}
#if defined(CONFIG_ARM_EXYNOS_ACME_DISABLE_BOOT_LOCK) && defined(CONFIG_ARM_EXYNOS_DEVFREQ_DISABLE_BOOT_LOCK)
else if (!strncmp(multicmd_cmd[i], "clkchange_test", 14))
multicmd_value |= (MULTICMD_CLKCHANGE_ON << MULTICMD_CLKCHANGE_SHIFT);
#endif
}
}
pr_emerg("%s: multicmd_value: %lu\n", __func__, multicmd_value);
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_MULTICMD | multicmd_value);
}

void sec_set_reboot_magic(int magic, int offset, int mask)
{
u32 tmp = 0;

exynos_pmu_read(SEC_DEBUG_MAGIC_INFORM, &tmp);
pr_info("%s: prev: %x\n", __func__, tmp);
mask <<= offset;
tmp &= (~mask);
tmp |= magic << offset;
pr_info("%s: set as: %x\n", __func__, tmp);
exynos_pmu_write(SEC_DEBUG_MAGIC_INFORM, tmp);
}
EXPORT_SYMBOL(sec_set_reboot_magic);

static void sec_power_off(void)
{
u32 poweroff_try = 0;
union power_supply_propval ac_val = {0, };
union power_supply_propval usb_val = {0, };
union power_supply_propval wpc_val = {0, };
u32 reboot_charging = 0;

sec_set_reboot_magic(SEC_REBOOT_LPM, SEC_REBOOT_END_OFFSET, 0xFF);
psy_do_property("ac", get, POWER_SUPPLY_PROP_ONLINE, ac_val);
psy_do_property("usb", get, POWER_SUPPLY_PROP_ONLINE, usb_val);
psy_do_property("wireless", get, POWER_SUPPLY_PROP_ONLINE, wpc_val);
reboot_charging = ac_val.intval || usb_val.intval || wpc_val.intval;
pr_info("[%s] reboot_charging(%d), AC[%d], USB[%d], WPC[%d]\n",
__func__, reboot_charging, ac_val.intval, usb_val.intval, wpc_val.intval);

pr_info("Exynos reboot, PWR Key(%d)\n", exynos_reboot_pwrkey_status());

flush_cache_all();

/* before power off */
pr_crit("%s: call pre-power_off notifiers\n", __func__);
atomic_notifier_call_chain(&sec_power_off_notifier_list, 0, NULL);

while (1) {
/* Check reboot charging */
#if IS_ENABLED(CONFIG_SEC_PARAM)
if ((reboot_charging || (poweroff_try >= 5)) && !lpcharge) {
#else
if (reboot_charging || (poweroff_try >= 5)) {
#endif
/* if reboot_charging is true, to enter LP charging.
* else Power Key HOLD
*/
if (reboot_charging) {
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_UNKNOWN);
pr_emerg("%s: charger connected or power off failed(%d), reboot!\n", __func__, poweroff_try);
} else {
sec_set_reboot_magic(SEC_REBOOT_NORMAL, SEC_REBOOT_END_OFFSET, 0xFF);
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_PKEY_HOLD);
pr_emerg("%s: POWER KEY HOLD, reboot!\n", __func__);
}

exynos_mach_restart("sw reset");

pr_emerg("%s: waiting for reboot\n", __func__);
while (1);
}
/* wait for power button release.
* but after exynos_acpm_reboot is called
* power on status cannot be read */
if (exynos_reboot_pwrkey_status())
pr_info("PWR Key is not released (%d)(poweroff_try:%d)\n", exynos_reboot_pwrkey_status(), poweroff_try);
else {
if (exynos_reboot_ops.acpm_reboot)
exynos_reboot_ops.acpm_reboot();
else
pr_err("Exynos reboot, acpm_reboot not registered\n");
pr_emerg("Set PS_HOLD Low.\n");
exynos_pmu_update(EXYNOS_PMU_PS_HOLD_CONTROL, 0x1<<8, 0x0);
pr_emerg("Should not reach here! Device will be restarted after 950 msec.\n");
mdelay(950);
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_UNKNOWN);;
exynos_mach_restart("sw reset");
pr_emerg("%s: waiting for reboot\n", __func__);
while (1);
}
++poweroff_try;
mdelay(1000);
}

}

static int sec_reboot(struct notifier_block *this,
unsigned long mode, void *cmd)
{
local_irq_disable();

hard_reset_delay();

if (sec_reboot_on_panic && !cmd)
cmd = panic_str;

pr_emerg("%s (%d, %s)\n", __func__, reboot_mode, cmd ? cmd : "(null)");

/* LPM mode prevention */
sec_set_reboot_magic(SEC_REBOOT_NORMAL, SEC_REBOOT_END_OFFSET, 0xFF);

if (cmd) {
unsigned long value;
if (!strcmp(cmd, "fota"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_FOTA);
else if (!strcmp(cmd, "fota_bl"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_FOTA_BL);
else if (!strcmp(cmd, "recovery"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_RECOVERY);
else if (!strcmp(cmd, "download"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_DOWNLOAD);
else if (!strcmp(cmd, "bootloader"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_BOOTLOADER);
else if (!strcmp(cmd, "upload"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_UPLOAD);
else if (!strcmp(cmd, "secure"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_SECURE);
else if (!strcmp(cmd, "wdownload"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_RECOVERY_WD);
else if (!strcmp(cmd, "wirelessd"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_WIRELESSD_BL);
else if (!strcmp(cmd, "factory"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_FACTORY);
else if (!strcmp(cmd, "fwup"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_FWUP);
else if (!strcmp(cmd, "em_mode_force_user"))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_EM_FUSE);
#if defined(CONFIG_SEC_ABC)
else if (!strcmp(cmd, "user_dram_test") && sec_abc_get_enabled())
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_USER_DRAM_TEST);
#endif
else if (!strncmp(cmd, "emergency", 9))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_EMERGENCY);
else if (!strncmp(cmd, "debug", 5) && !kstrtoul(cmd + 5, 0, &value))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_DEBUG | value);
else if (!strncmp(cmd, "dump_sink", 9) && !kstrtoul(cmd + 9, 0, &value))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_DUMPSINK | (SEC_DUMPSINK_MASK & value));
else if (!strncmp(cmd, "forceupload", 11) && !kstrtoul(cmd + 11, 0, &value))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_FORCE_UPLOAD | value);
else if (!strncmp(cmd, "dprm", 4))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_DPRM);
else if (!strncmp(cmd, "swsel", 5) && !kstrtoul(cmd + 5, 0, &value))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_SWSEL | value);
else if (!strncmp(cmd, "sud", 3) && !kstrtoul(cmd + 3, 0, &value))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_SUD | value);
else if (!strncmp(cmd, "multicmd:", 9))
sec_multicmd(cmd);
#if defined(CONFIG_SEC_SYSUP)
else if (!strncmp(cmd, "param", 5))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_PARAM);
#endif
else if (!strncmp(cmd, "cpmem_on", 8))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_CP_DBGMEM | 0x1);
else if (!strncmp(cmd, "cpmem_off", 9))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_CP_DBGMEM | 0x2);
else if (!strncmp(cmd, "mbsmem_on", 9))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_CP_DBGMEM | 0x1);
else if (!strncmp(cmd, "mbsmem_off", 10))
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_CP_DBGMEM | 0x2);
else if (!strncmp(cmd, "watchonly", 9)){
int wcoff = 10;
if (!strncmp(cmd + wcoff, "exercise", 8))
wcoff += 9;

if (((char*)cmd)[wcoff] == '0')
kstrtoul(cmd + (wcoff + 1), 0, &value);
else
kstrtoul(cmd + wcoff, 0, &value);

if (((char*)cmd)[wcoff - 1] == '+')
value |= 1 << 0xf;

exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_SET_POWEROFF_WATCH | value);
} else if (!strncmp(cmd, "panic", 5)) {
/*
* This line is intentionally blanked because the PANIC INFORM is used for upload cause
* in sec_debug_set_upload_cause() only in case of panic() .
*/
} else
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_UNKNOWN);
} else {
exynos_pmu_write(SEC_DEBUG_PANIC_INFORM, SEC_RESET_REASON_UNKNOWN);
}

flush_cache_all();

return NOTIFY_DONE;
}

static int sec_reboot_panic_handler(struct notifier_block *nb,
unsigned long l, void *buf)
{
pr_emerg("sec_reboot: %s\n", __func__);

sec_reboot_on_panic = 1;

return NOTIFY_DONE;
}

static struct notifier_block nb_panic_block = {
.notifier_call = sec_reboot_panic_handler,
.priority = 128,
};

static struct notifier_block sec_restart_nb = {
.notifier_call = sec_reboot,
.priority = 130,
};

static int __init sec_reboot_init(void)
{
int err;

err = atomic_notifier_chain_register(&panic_notifier_list, &nb_panic_block);
if (err) {
pr_err("cannot register panic handler (err=%d)\n", err);
}

err = register_restart_handler(&sec_restart_nb);
if (err) {
pr_err("cannot register restart handler (err=%d)\n", err);
}
pm_power_off = sec_power_off;

pr_info("register restart handler successfully\n");

return err;
}

subsys_initcall(sec_reboot_init);

Maybe via reboot...

Oh I know.... your project is Top Secret.