diff options
| author | Anson Huang <Anson.Huang@nxp.com> | 2017-01-09 18:14:29 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | 20e92f89e4ea4582d5fd31ba023766b52c2e9ea1 (patch) | |
| tree | a810e3139f9b9e7aa4c2ffeeb69e219bda0b9bca /drivers/rtc | |
| parent | b98b9d70fae01939b0860658487c0e5cac4c8dab (diff) | |
MLK-13702 rtc: snvs: make sure set time is working for i.mx7ulp
On i.MX7ULP, only waiting for enable bit of SNVS RTC clear is
NOT enough for RTC time program, need to add at least 12us delay,
here adds 38us margins to make sure RTC time can be changed, and
this is NOT harmful for other i.MX.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-snvs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c index 082f85c601fe..31effe234b3d 100644 --- a/drivers/rtc/rtc-snvs.c +++ b/drivers/rtc/rtc-snvs.c @@ -1,5 +1,6 @@ /* * Copyright (C) 2011-2016 Freescale Semiconductor, Inc. + * Copyright 2017 NXP * * The code contained herein is licensed under the GNU General Public * License. You may obtain a copy of the GNU General Public License @@ -18,6 +19,7 @@ #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/clk.h> +#include <linux/delay.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> @@ -146,6 +148,8 @@ static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm) if (ret) return ret; + udelay(50); + /* Write 32-bit time to 47-bit timer, leaving 15 LSBs blank */ regmap_write(data->regmap, data->offset + SNVS_LPSRTCLR, time << CNTR_TO_SECS_SH); regmap_write(data->regmap, data->offset + SNVS_LPSRTCMR, time >> (32 - CNTR_TO_SECS_SH)); |