236 lines
5.4 KiB
C
236 lines
5.4 KiB
C
/*
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* Copyright (C) 2017 NXP.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*/
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#include <linux/arm-smccc.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/watchdog.h>
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#include <soc/imx/fsl_sip.h>
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#include <soc/imx8/sc/sci.h>
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#include <soc/imx8/sc/svc/irq/api.h>
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#define DEFAULT_TIMEOUT 60
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/*
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* Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
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* in theory, but for normal case, 1s~128s is enough, you can change this max
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* value in case it's not enough.
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*/
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#define MAX_TIMEOUT 128
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0000);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static unsigned int timeout = DEFAULT_TIMEOUT;
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module_param(timeout, uint, 0000);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
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__MODULE_STRING(DEFAULT_TIMEOUT) ")");
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static struct watchdog_device imx8_wdd;
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static int imx8_wdt_notify(struct notifier_block *nb,
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unsigned long event, void *group)
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{
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/* ignore other irqs */
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if (!(event & SC_IRQ_WDOG &&
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(*(sc_irq_group_t *)group == SC_IRQ_GROUP_WDOG)))
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return 0;
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watchdog_notify_pretimeout(&imx8_wdd);
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return 0;
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}
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static int imx8_wdt_ping(struct watchdog_device *wdog)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_PING_WDOG, 0, 0, 0, 0, 0, 0,
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&res);
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return res.a0;
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}
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static int imx8_wdt_start(struct watchdog_device *wdog)
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{
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struct arm_smccc_res res;
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/* no block */
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_START_WDOG, 0, 0, 0, 0, 0, 0,
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&res);
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if (res.a0)
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return res.a0;
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/* TODO: change to SC_TIMER_WDOG_ACTION_PARTITION after SCFW support */
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_WDOG_ACT,
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SC_TIMER_WDOG_ACTION_BOARD, 0, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static int imx8_wdt_stop(struct watchdog_device *wdog)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_STOP_WDOG, 0, 0, 0, 0, 0, 0,
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&res);
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return res.a0;
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}
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static int imx8_wdt_set_timeout(struct watchdog_device *wdog,
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unsigned int timeout)
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{
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struct arm_smccc_res res;
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wdog->timeout = timeout;
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_TIMEOUT_WDOG,
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timeout * 1000, 0, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static int imx8_wdt_set_pretimeout(struct watchdog_device *wdog,
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unsigned int new_pretimeout)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_PRETIME_WDOG,
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new_pretimeout * 1000, 0, 0, 0, 0, 0,
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&res);
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return res.a0;
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}
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static const struct watchdog_ops imx8_wdt_ops = {
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.owner = THIS_MODULE,
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.start = imx8_wdt_start,
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.stop = imx8_wdt_stop,
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.ping = imx8_wdt_ping,
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.set_timeout = imx8_wdt_set_timeout,
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.set_pretimeout = imx8_wdt_set_pretimeout,
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};
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static const struct watchdog_info imx8_wdt_info = {
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.identity = "i.MX8 watchdog timer",
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT,
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};
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static struct notifier_block imx8_wdt_notifier = {
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.notifier_call = imx8_wdt_notify,
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};
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#ifdef CONFIG_PM_SLEEP
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static int imx8_wdt_suspend(struct device *dev)
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{
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if (test_bit(WDOG_ACTIVE, &imx8_wdd.status))
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imx8_wdt_stop(&imx8_wdd);
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return 0;
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}
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static int imx8_wdt_resume(struct device *dev)
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{
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if (test_bit(WDOG_ACTIVE, &imx8_wdd.status))
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imx8_wdt_start(&imx8_wdd);
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return 0;
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}
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static const struct dev_pm_ops imx8_wdt_pm_ops = {
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.suspend = imx8_wdt_suspend,
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.resume = imx8_wdt_resume,
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};
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#define IMX8_WDT_PM_OPS (&imx8_wdt_pm_ops)
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#else
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#define IMX8_WDT_PM_OPS NULL
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#endif
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static int imx8_wdt_probe(struct platform_device *pdev)
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{
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struct watchdog_device *wdt = &imx8_wdd;
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int err;
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platform_set_drvdata(pdev, wdt);
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/* init the wdd */
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wdt->info = &imx8_wdt_info;
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wdt->ops = &imx8_wdt_ops;
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wdt->min_timeout = 1;
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wdt->max_timeout = MAX_TIMEOUT;
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wdt->parent = &pdev->dev;
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watchdog_set_drvdata(wdt, NULL);
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err = watchdog_init_timeout(wdt, DEFAULT_TIMEOUT, &pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Failed to init the wdog timeout:%d\n",
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err);
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return err;
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}
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err = watchdog_register_device(wdt);
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if (err) {
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dev_err(&pdev->dev, "Failed to register watchdog device\n");
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return err;
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}
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return register_scu_notifier(&imx8_wdt_notifier);
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}
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static int imx8_wdt_remove(struct platform_device *pdev)
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{
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struct watchdog_device *wdt = platform_get_drvdata(pdev);
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imx8_wdt_stop(wdt);
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watchdog_unregister_device(wdt);
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return 0;
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}
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static void imx8_wdt_shutdown(struct platform_device *pdev)
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{
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struct watchdog_device *wdt = platform_get_drvdata(pdev);
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if (watchdog_active(wdt))
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imx8_wdt_stop(wdt);
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}
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static const struct of_device_id imx8_wdt_dt_ids[] = {
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{ .compatible = "fsl,imx8-wdt", },
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{ /*sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx8_wdt_dt_ids);
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static struct platform_driver imx8_wdt_driver = {
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.probe = imx8_wdt_probe,
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.remove = imx8_wdt_remove,
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.shutdown = imx8_wdt_shutdown,
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.driver = {
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.name = "imx8-wdt",
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.of_match_table = imx8_wdt_dt_ids,
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.pm = IMX8_WDT_PM_OPS,
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},
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};
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module_platform_driver(imx8_wdt_driver);
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MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
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MODULE_DESCRIPTION("NXP i.MX8 watchdog driver");
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MODULE_LICENSE("GPL v2");
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