1 // SPDX-License-Identifier: GPL-2.0
4  * This is a 12-bit timer driver from a (62.5/16384) MHz clock. It can't even
56 	writel(0, wdt->base + RZN1_WDT_RETRIGGER);  in rzn1_wdt_ping()
69 	 * timeout once started. Also note that the WDT clock is half the bus  in rzn1_wdt_start()
76 	val |= compute_reload_value(w->max_hw_heartbeat_ms, wdt->clk_rate_khz);  in rzn1_wdt_start()
77 	writel(val, wdt->base + RZN1_WDT_RETRIGGER);  in rzn1_wdt_start()
103 	struct device *dev = &pdev->dev;  in rzn1_wdt_probe()
105 	struct device_node *np = dev->of_node;  in rzn1_wdt_probe()
113 		return -ENOMEM;  in rzn1_wdt_probe()
115 	wdt->base = devm_platform_ioremap_resource(pdev, 0);  in rzn1_wdt_probe()
116 	if (IS_ERR(wdt->base))  in rzn1_wdt_probe()
117 		return PTR_ERR(wdt->base);  in rzn1_wdt_probe()
124 			       np->name, wdt);  in rzn1_wdt_probe()
139 		return -EINVAL;  in rzn1_wdt_probe()
142 	wdt->clk_rate_khz = clk_rate / 1000;  in rzn1_wdt_probe()
143 	wdt->wdtdev.info = &rzn1_wdt_info;  in rzn1_wdt_probe()
144 	wdt->wdtdev.ops = &rzn1_wdt_ops;  in rzn1_wdt_probe()
145 	wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;  in rzn1_wdt_probe()
146 	wdt->wdtdev.parent = dev;  in rzn1_wdt_probe()
148 	 * The period of the watchdog cannot be changed once set  in rzn1_wdt_probe()
149 	 * and is limited to a very short period.  in rzn1_wdt_probe()
150 	 * Configure it for a 1s period once and for all, and  in rzn1_wdt_probe()
151 	 * rely on the heart-beat provided by the watchdog core  in rzn1_wdt_probe()
152 	 * to make this usable by the user-space.  in rzn1_wdt_probe()
154 	wdt->wdtdev.max_hw_heartbeat_ms = max_heart_beat_ms(wdt->clk_rate_khz);  in rzn1_wdt_probe()
155 	if (wdt->wdtdev.max_hw_heartbeat_ms > 1000)  in rzn1_wdt_probe()
156 		wdt->wdtdev.max_hw_heartbeat_ms = 1000;  in rzn1_wdt_probe()
158 	wdt->wdtdev.timeout = DEFAULT_TIMEOUT;  in rzn1_wdt_probe()
159 	ret = watchdog_init_timeout(&wdt->wdtdev, 0, dev);  in rzn1_wdt_probe()
163 	watchdog_set_drvdata(&wdt->wdtdev, wdt);  in rzn1_wdt_probe()
165 	return devm_watchdog_register_device(dev, &wdt->wdtdev);  in rzn1_wdt_probe()
170 	{ .compatible = "renesas,rzn1-wdt" },