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authorAnson Huang <Anson.Huang@nxp.com>2020-05-22 05:19:56 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2020-05-30 04:17:48 +0300
commit4b957bde561f3a56865395be06f1be2c196b0b5e (patch)
tree6dad74f8a0426de085da4a152cde954ffd56e4fc /drivers/rtc
parent20af67700bc39bccd838414128f63a72965de6e7 (diff)
downloadlinux-4b957bde561f3a56865395be06f1be2c196b0b5e.tar.xz
rtc: snvs: Add necessary clock operations for RTC APIs
There could be still RTC registers access after RTC suspend with clock disabled, need to add clock operations for each RTC API to make sure accessing RTC registers is successfully. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/1590113996-31845-2-git-send-email-Anson.Huang@nxp.com
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-snvs.c55
1 files changed, 53 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index b9371f471abe..0263d996b8a8 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -148,10 +148,21 @@ static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
- unsigned long time = rtc_read_lp_counter(data);
+ unsigned long time;
+ int ret;
+
+ if (data->clk) {
+ ret = clk_enable(data->clk);
+ if (ret)
+ return ret;
+ }
+ time = rtc_read_lp_counter(data);
rtc_time64_to_tm(time, tm);
+ if (data->clk)
+ clk_disable(data->clk);
+
return 0;
}
@@ -161,6 +172,12 @@ static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm)
unsigned long time = rtc_tm_to_time64(tm);
int ret;
+ if (data->clk) {
+ ret = clk_enable(data->clk);
+ if (ret)
+ return ret;
+ }
+
/* Disable RTC first */
ret = snvs_rtc_enable(data, false);
if (ret)
@@ -173,6 +190,9 @@ static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm)
/* Enable RTC again */
ret = snvs_rtc_enable(data, true);
+ if (data->clk)
+ clk_disable(data->clk);
+
return ret;
}
@@ -180,6 +200,13 @@ static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
u32 lptar, lpsr;
+ int ret;
+
+ if (data->clk) {
+ ret = clk_enable(data->clk);
+ if (ret)
+ return ret;
+ }
regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
rtc_time64_to_tm(lptar, &alrm->time);
@@ -187,18 +214,33 @@ static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;
+ if (data->clk)
+ clk_disable(data->clk);
+
return 0;
}
static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ if (data->clk) {
+ ret = clk_enable(data->clk);
+ if (ret)
+ return ret;
+ }
regmap_update_bits(data->regmap, data->offset + SNVS_LPCR,
(SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN),
enable ? (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN) : 0);
- return rtc_write_sync_lp(data);
+ ret = rtc_write_sync_lp(data);
+
+ if (data->clk)
+ clk_disable(data->clk);
+
+ return ret;
}
static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
@@ -207,6 +249,12 @@ static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
unsigned long time = rtc_tm_to_time64(&alrm->time);
int ret;
+ if (data->clk) {
+ ret = clk_enable(data->clk);
+ if (ret)
+ return ret;
+ }
+
regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
ret = rtc_write_sync_lp(data);
if (ret)
@@ -216,6 +264,9 @@ static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
/* Clear alarm interrupt status bit */
regmap_write(data->regmap, data->offset + SNVS_LPSR, SNVS_LPSR_LPTA);
+ if (data->clk)
+ clk_disable(data->clk);
+
return snvs_rtc_alarm_irq_enable(dev, alrm->enabled);
}