rtc: isl1208: set ev-evienb bit from device tree

Add support to disable event in pull-up.

Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index f4eb3e11de28..ea18a8f4bce0 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -44,6 +44,7 @@
 #define ISL1208_REG_INT_IM     (1<<7)   /* interrupt/alarm mode */
 #define ISL1219_REG_EV  0x09
 #define ISL1219_REG_EV_EVEN    (1<<4)   /* event detection enable */
+#define ISL1219_REG_EV_EVIENB  (1<<7)   /* event in pull-up disable */
 #define ISL1208_REG_ATR 0x0a
 #define ISL1208_REG_DTR 0x0b
 
@@ -777,8 +778,22 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
                          "please set clock.\n");
 
         if (id->driver_data == TYPE_ISL1219) {
-                rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV,
-                                               ISL1219_REG_EV_EVEN);
+                struct device_node *np = client->dev.of_node;
+                u32 evienb;
+
+                rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
+                if (rc < 0) {
+                        dev_err(&client->dev, "failed to read EV reg\n");
+                        return rc;
+                }
+                rc |= ISL1219_REG_EV_EVEN;
+                if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
+                        if (evienb)
+                                rc |= ISL1219_REG_EV_EVIENB;
+                        else
+                                rc &= ~ISL1219_REG_EV_EVIENB;
+                }
+                rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
                 if (rc < 0) {
                         dev_err(&client->dev, "could not enable tamper detection\n");
                         return rc;
@@ -786,7 +801,7 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
                 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
                 if (rc)
                         return rc;
-                evdet_irq = of_irq_get_byname(client->dev.of_node, "evdet");
+                evdet_irq = of_irq_get_byname(np, "evdet");
         }
 
         rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);