rtc: ep93xx: add DT support for Cirrus EP93xx

Add OF ID match table.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Link: https://lore.kernel.org/r/20230915-ep93xx-v4-14-a1d779dcec10@maquefel.me
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-ep93xx.c

@@ -7,6 +7,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
@@ -148,9 +149,16 @@ static int ep93xx_rtc_probe(struct platform_device *pdev)
 	return devm_rtc_register_device(ep93xx_rtc->rtc);
 }
 
+static const struct of_device_id ep93xx_rtc_of_ids[] = {
+	{ .compatible = "cirrus,ep9301-rtc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ep93xx_rtc_of_ids);
+
 static struct platform_driver ep93xx_rtc_driver = {
 	.driver		= {
 		.name	= "ep93xx-rtc",
+		.of_match_table = ep93xx_rtc_of_ids,
 	},
 	.probe		= ep93xx_rtc_probe,
 };