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path: root/drivers/rtc/rtc-pcf8523.c
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Diffstat (limited to 'drivers/rtc/rtc-pcf8523.c')
-rw-r--r--drivers/rtc/rtc-pcf8523.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index 3fcd2cbafc84..b5c61a70b5df 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -97,8 +97,9 @@ static int pcf8523_voltage_low(struct i2c_client *client)
return !!(value & REG_CONTROL3_BLF);
}
-static int pcf8523_select_capacitance(struct i2c_client *client, bool high)
+static int pcf8523_load_capacitance(struct i2c_client *client)
{
+ u32 load;
u8 value;
int err;
@@ -106,14 +107,24 @@ static int pcf8523_select_capacitance(struct i2c_client *client, bool high)
if (err < 0)
return err;
- if (!high)
- value &= ~REG_CONTROL1_CAP_SEL;
- else
+ load = 12500;
+ of_property_read_u32(client->dev.of_node, "quartz-load-femtofarads",
+ &load);
+
+ switch (load) {
+ default:
+ dev_warn(&client->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500",
+ load);
+ /* fall through */
+ case 12500:
value |= REG_CONTROL1_CAP_SEL;
+ break;
+ case 7000:
+ value &= ~REG_CONTROL1_CAP_SEL;
+ break;
+ }
err = pcf8523_write(client, REG_CONTROL1, value);
- if (err < 0)
- return err;
return err;
}
@@ -347,9 +358,10 @@ static int pcf8523_probe(struct i2c_client *client,
if (!pcf)
return -ENOMEM;
- err = pcf8523_select_capacitance(client, true);
+ err = pcf8523_load_capacitance(client);
if (err < 0)
- return err;
+ dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
+ err);
err = pcf8523_set_pm(client, 0);
if (err < 0)
@@ -374,6 +386,7 @@ MODULE_DEVICE_TABLE(i2c, pcf8523_id);
#ifdef CONFIG_OF
static const struct of_device_id pcf8523_of_match[] = {
{ .compatible = "nxp,pcf8523" },
+ { .compatible = "microcrystal,rv8523" },
{ }
};
MODULE_DEVICE_TABLE(of, pcf8523_of_match);