@@ -7,6 +7,7 @@
#include <linux/bcd.h>
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
@@ -628,6 +629,18 @@ isl1208_rtc_interrupt(int irq, void *data)
struct isl1208_state *isl1208 = i2c_get_clientdata(client);
int handled = 0, sr, err;
+ if (!isl1208->config->has_tamper) {
+ /*
+ * The INT# output is pulled low 250ms after the alarm is
+ * triggered. After the INT# output is pulled low, it is low for
+ * at least 250ms, even if the correct action is taken to clear
+ * it. It is impossible to clear ALM if it is still active. The
+ * host must wait for the RTC to progress past the alarm time
+ * plus the 250ms delay before clearing ALM.
+ */
+ msleep(250);
+ }
+
/*
* I2C reads get NAK'ed if we read straight away after an interrupt?
* Using a mdelay/msleep didn't seem to help either, so we work around