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authorMyungJoo Ham <myungjoo.ham@samsung.com>2011-01-04 00:17:39 -0500
committerSamuel Ortiz <sameo@linux.intel.com>2011-01-14 06:38:16 -0500
commit337ce5d1c5759644cea6c47220ce7e84f0398362 (patch)
tree0436dbc242425226202476d6181fa6ae89e3a206 /drivers/regulator
parentde8255ccd219267cfd34139022b197c1ef8f032f (diff)
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 'drivers/regulator')
-rw-r--r--drivers/regulator/max8998.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 7568df6122ab..af52ebfc4927 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -835,6 +835,12 @@ static int __devexit max8998_pmic_remove(struct platform_device *pdev)
835 return 0; 835 return 0;
836} 836}
837 837
838static const struct platform_device_id max8998_pmic_id[] = {
839 { "max8998-pmic", TYPE_MAX8998 },
840 { "lp3974-pmic", TYPE_LP3974 },
841 { }
842};
843
838static struct platform_driver max8998_pmic_driver = { 844static struct platform_driver max8998_pmic_driver = {
839 .driver = { 845 .driver = {
840 .name = "max8998-pmic", 846 .name = "max8998-pmic",
@@ -842,6 +848,7 @@ static struct platform_driver max8998_pmic_driver = {
842 }, 848 },
843 .probe = max8998_pmic_probe, 849 .probe = max8998_pmic_probe,
844 .remove = __devexit_p(max8998_pmic_remove), 850 .remove = __devexit_p(max8998_pmic_remove),
851 .id_table = max8998_pmic_id,
845}; 852};
846 853
847static int __init max8998_pmic_init(void) 854static int __init max8998_pmic_init(void)