watchdog: loongson1_wdt: Add DT support

This patch adds the of_match_table to enable DT support
of Loongson-1 watchdog driver.
And modify the parameter of devm_clk_get_enabled() accordingly.

Signed-off-by: Keguang Zhang <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/loongson1_wdt.c

···
 
 #include <linux/clk.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/watchdog.h>
 
···
 	if (IS_ERR(drvdata->base))
 		return PTR_ERR(drvdata->base);
 
-	drvdata->clk = devm_clk_get_enabled(dev, pdev->name);
+	drvdata->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(drvdata->clk))
 		return PTR_ERR(drvdata->clk);
 
···
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id ls1x_wdt_dt_ids[] = {
+	{ .compatible = "loongson,ls1b-wdt", },
+	{ .compatible = "loongson,ls1c-wdt", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls1x_wdt_dt_ids);
+#endif
+
 static struct platform_driver ls1x_wdt_driver = {
 	.probe = ls1x_wdt_probe,
 	.driver = {
 		.name = "ls1x-wdt",
+		.of_match_table = of_match_ptr(ls1x_wdt_dt_ids),
 	},
 };