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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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865802917f
Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches Cc: Support Opensource <support.opensource@diasemi.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Steve Twiss <stwiss.opensource@diasemi.com> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
241 lines
6.1 KiB
C
241 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Watchdog driver for DA9063 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9063/core.h>
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#include <linux/regmap.h>
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/*
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* Watchdog selector to timeout in seconds.
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* 0: WDT disabled;
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* others: timeout = 2048 ms * 2^(TWDSCALE-1).
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*/
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static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
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#define DA9063_TWDSCALE_DISABLE 0
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#define DA9063_TWDSCALE_MIN 1
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#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
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#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
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#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
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#define DA9063_WDG_TIMEOUT wdt_timeout[3]
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#define DA9063_RESET_PROTECTION_MS 256
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static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
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{
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unsigned int i;
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for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
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if (wdt_timeout[i] >= secs)
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return i;
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}
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return DA9063_TWDSCALE_MAX;
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}
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/*
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* Return 0 if watchdog is disabled, else non zero.
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*/
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static unsigned int da9063_wdt_is_running(struct da9063 *da9063)
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{
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unsigned int val;
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regmap_read(da9063->regmap, DA9063_REG_CONTROL_D, &val);
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return val & DA9063_TWDSCALE_MASK;
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}
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static int da9063_wdt_disable_timer(struct da9063 *da9063)
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{
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return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK,
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DA9063_TWDSCALE_DISABLE);
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}
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static int
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da9063_wdt_update_timeout(struct da9063 *da9063, unsigned int timeout)
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{
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unsigned int regval;
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int ret;
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/*
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* The watchdog triggers a reboot if a timeout value is already
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* programmed because the timeout value combines two functions
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* in one: indicating the counter limit and starting the watchdog.
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* The watchdog must be disabled to be able to change the timeout
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* value if the watchdog is already running. Then we can set the
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* new timeout value which enables the watchdog again.
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*/
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ret = da9063_wdt_disable_timer(da9063);
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if (ret)
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return ret;
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usleep_range(150, 300);
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regval = da9063_wdt_timeout_to_sel(timeout);
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return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK, regval);
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}
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static int da9063_wdt_start(struct watchdog_device *wdd)
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{
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struct da9063 *da9063 = watchdog_get_drvdata(wdd);
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int ret;
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ret = da9063_wdt_update_timeout(da9063, wdd->timeout);
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if (ret)
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dev_err(da9063->dev, "Watchdog failed to start (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_stop(struct watchdog_device *wdd)
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{
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struct da9063 *da9063 = watchdog_get_drvdata(wdd);
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int ret;
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ret = da9063_wdt_disable_timer(da9063);
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if (ret)
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dev_alert(da9063->dev, "Watchdog failed to stop (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_ping(struct watchdog_device *wdd)
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{
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struct da9063 *da9063 = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
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DA9063_WATCHDOG);
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if (ret)
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dev_alert(da9063->dev, "Failed to ping the watchdog (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct da9063 *da9063 = watchdog_get_drvdata(wdd);
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int ret = 0;
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/*
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* There are two cases when a set_timeout() will be called:
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* 1. The watchdog is off and someone wants to set the timeout for the
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* further use.
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* 2. The watchdog is already running and a new timeout value should be
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* set.
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*
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* The watchdog can't store a timeout value not equal zero without
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* enabling the watchdog, so the timeout must be buffered by the driver.
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*/
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if (watchdog_active(wdd))
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ret = da9063_wdt_update_timeout(da9063, timeout);
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if (ret)
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dev_err(da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
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ret);
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else
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wdd->timeout = wdt_timeout[da9063_wdt_timeout_to_sel(timeout)];
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return ret;
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}
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static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
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void *data)
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{
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struct da9063 *da9063 = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
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DA9063_SHUTDOWN);
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if (ret)
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dev_alert(da9063->dev, "Failed to shutdown (err = %d)\n",
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ret);
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return ret;
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}
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static const struct watchdog_info da9063_watchdog_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "DA9063 Watchdog",
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};
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static const struct watchdog_ops da9063_watchdog_ops = {
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.owner = THIS_MODULE,
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.start = da9063_wdt_start,
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.stop = da9063_wdt_stop,
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.ping = da9063_wdt_ping,
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.set_timeout = da9063_wdt_set_timeout,
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.restart = da9063_wdt_restart,
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};
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static int da9063_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da9063 *da9063;
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struct watchdog_device *wdd;
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if (!dev->parent)
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return -EINVAL;
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da9063 = dev_get_drvdata(dev->parent);
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if (!da9063)
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return -EINVAL;
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wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
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if (!wdd)
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return -ENOMEM;
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wdd->info = &da9063_watchdog_info;
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wdd->ops = &da9063_watchdog_ops;
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wdd->min_timeout = DA9063_WDT_MIN_TIMEOUT;
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wdd->max_timeout = DA9063_WDT_MAX_TIMEOUT;
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wdd->min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS;
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wdd->timeout = DA9063_WDG_TIMEOUT;
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wdd->parent = dev;
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wdd->status = WATCHDOG_NOWAYOUT_INIT_STATUS;
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watchdog_set_restart_priority(wdd, 128);
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watchdog_set_drvdata(wdd, da9063);
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/* Change the timeout to the default value if the watchdog is running */
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if (da9063_wdt_is_running(da9063)) {
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da9063_wdt_update_timeout(da9063, DA9063_WDG_TIMEOUT);
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set_bit(WDOG_HW_RUNNING, &wdd->status);
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}
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return devm_watchdog_register_device(dev, wdd);
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}
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static struct platform_driver da9063_wdt_driver = {
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.probe = da9063_wdt_probe,
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.driver = {
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.name = DA9063_DRVNAME_WATCHDOG,
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},
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};
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module_platform_driver(da9063_wdt_driver);
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MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
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MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);
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