1 // SPDX-License-Identifier: GPL-2.0-only
3  * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
20 #include <asm/mach-ralink/ralink_regs.h>
71 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1LOAD, w->timeout * drvdata->freq);  in rt288x_wdt_ping()
81 	t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);  in rt288x_wdt_start()
86 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);  in rt288x_wdt_start()
90 	t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);  in rt288x_wdt_start()
92 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);  in rt288x_wdt_start()
104 	t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);  in rt288x_wdt_stop()
106 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);  in rt288x_wdt_stop()
113 	w->timeout = t;  in rt288x_wdt_set_timeout()
142 	struct device *dev = &pdev->dev;  in rt288x_wdt_probe()
149 		return -ENOMEM;  in rt288x_wdt_probe()
151 	drvdata->base = devm_platform_ioremap_resource(pdev, 0);  in rt288x_wdt_probe()
152 	if (IS_ERR(drvdata->base))  in rt288x_wdt_probe()
153 		return PTR_ERR(drvdata->base);  in rt288x_wdt_probe()
155 	drvdata->clk = devm_clk_get(dev, NULL);  in rt288x_wdt_probe()
156 	if (IS_ERR(drvdata->clk))  in rt288x_wdt_probe()
157 		return PTR_ERR(drvdata->clk);  in rt288x_wdt_probe()
159 	drvdata->rst = devm_reset_control_get_exclusive(dev, NULL);  in rt288x_wdt_probe()
160 	if (!IS_ERR(drvdata->rst))  in rt288x_wdt_probe()
161 		reset_control_deassert(drvdata->rst);  in rt288x_wdt_probe()
163 	drvdata->freq = clk_get_rate(drvdata->clk) / RALINK_WDT_PRESCALE;  in rt288x_wdt_probe()
165 	wdt = &drvdata->wdt;  in rt288x_wdt_probe()
166 	wdt->info = &rt288x_wdt_info;  in rt288x_wdt_probe()
167 	wdt->ops = &rt288x_wdt_ops;  in rt288x_wdt_probe()
168 	wdt->min_timeout = 1;  in rt288x_wdt_probe()
169 	wdt->max_timeout = (0xfffful / drvdata->freq);  in rt288x_wdt_probe()
170 	wdt->parent = dev;  in rt288x_wdt_probe()
171 	wdt->bootstatus = rt288x_wdt_bootcause();  in rt288x_wdt_probe()
173 	watchdog_init_timeout(wdt, wdt->max_timeout, dev);  in rt288x_wdt_probe()
178 	ret = devm_watchdog_register_device(dev, &drvdata->wdt);  in rt288x_wdt_probe()
186 	{ .compatible = "ralink,rt2880-wdt" },