A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 03:27:44 -04:00
Code Issues Projects Releases Packages Wiki Activity

mfd: Support LP3974 RTC

Browse source 
The first releases of LP3974 have a large delay in RTC registers,
which requires 2 seconds of delay after writing to a rtc register
(recommended by National Semiconductor's engineers)
before reading it.

If "rtc_delay" field of the platform data is true, the rtc driver
assumes that such delays are required. Although we have not seen
LP3974s without requiring such delays, we assume that such LP3974s
will be released soon (or they have done so already) and they are
supported by "lp3974" without setting "rtc_delay" at the platform
data.

This patch adds delays with msleep when writing values to RTC registers
if the platform data has rtc_delay set.

Signed-off-by: MyungJoo Ham <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
MyungJoo Ham 2011-01-04 14:17:39 +09:00 • committed by Samuel Ortiz
commit 337ce5d1c5
4 changed files with 83 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

26
drivers/mfd/max8998.c
View file

@ -42,6 +42,14 @@ static struct mfd_cell max8998_devs[] = {
},
};
static struct mfd_cell lp3974_devs[] = {
{
.name = "lp3974-pmic",
}, {
.name = "lp3974-rtc",
},
};
int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
@ -146,11 +154,23 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
max8998_irq_init(max8998);
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0);
pm_runtime_set_active(max8998->dev);
switch (id->driver_data) {
case TYPE_LP3974:
ret = mfd_add_devices(max8998->dev, -1,
lp3974_devs, ARRAY_SIZE(lp3974_devs),
NULL, 0);
break;
case TYPE_MAX8998:
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0);
break;
default:
ret = -EINVAL;
}
if (ret < 0)
goto err;