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authorMyungJoo Ham <myungjoo.ham@samsung.com>2011-01-04 08:17:39 +0300
committerSamuel Ortiz <sameo@linux.intel.com>2011-01-14 14:38:16 +0300
commit337ce5d1c5759644cea6c47220ce7e84f0398362 (patch)
tree0436dbc242425226202476d6181fa6ae89e3a206 /include/linux/mfd
parentde8255ccd219267cfd34139022b197c1ef8f032f (diff)
downloadlinux-337ce5d1c5759644cea6c47220ce7e84f0398362.tar.xz
mfd: Support LP3974 RTC
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 <myungjoo.ham@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'include/linux/mfd')
-rw-r--r--include/linux/mfd/max8998.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/mfd/max8998.h b/include/linux/mfd/max8998.h
index 686a744e63fb..c22b9a417c35 100644
--- a/include/linux/mfd/max8998.h
+++ b/include/linux/mfd/max8998.h
@@ -76,6 +76,9 @@ struct max8998_regulator_data {
* @buck1_set1: BUCK1 gpio pin 1 to set output voltage
* @buck1_set2: BUCK1 gpio pin 2 to set output voltage
* @buck2_set3: BUCK2 gpio pin to set output voltage
+ * @wakeup: Allow to wake up from suspend
+ * @rtc_delay: LP3974 RTC chip bug that requires delay after a register
+ * write before reading it.
*/
struct max8998_platform_data {
struct max8998_regulator_data *regulators;
@@ -89,6 +92,7 @@ struct max8998_platform_data {
int buck1_set2;
int buck2_set3;
bool wakeup;
+ bool rtc_delay;
};
#endif /* __LINUX_MFD_MAX8998_H */