[PATCH v6 1/2] rtc: omap: use of_device_is_system_power_controller function

[PATCH v6 1/2] rtc: omap: use of_device_is_system_power_controller function

[Keerthy]

Use of_device_is_system_power_controller instead of manually reading
the system-power-controller property from the device tree node.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Keerthy <j-keerthy@ti.com>
---
 drivers/rtc/rtc-omap.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 323ff55..44ff4cc 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -721,8 +721,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	if (of_id) {
 		rtc->type = of_id->data;
 		rtc->is_pmic_controller = rtc->type->has_pmic_mode &&
-				of_property_read_bool(pdev->dev.of_node,
-						"system-power-controller");
+			of_device_is_system_power_controller(pdev->dev.of_node);
 	} else {
 		id_entry = platform_get_device_id(pdev);
 		rtc->type = (void *)id_entry->driver_data;
-- 
1.9.1

[PATCH v6 2/2] rtc: omap: Cut down the shutdown time from 2 seconds to 1 sec

[Keerthy]

Cut down the shutdown time from 2 seconds to 1 sec. In case of roll
over try again.

Signed-off-by: Keerthy <j-keerthy@ti.com>
---
 drivers/rtc/rtc-omap.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 44ff4cc..320b4a5 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -421,12 +421,6 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
  * The RTC can be used to control an external PMIC via the pmic_power_en pin,
  * which can be configured to transition to OFF on ALARM2 events.
  *
- * Notes:
- * The two-second alarm offset is the shortest offset possible as the alarm
- * registers must be set before the next timer update and the offset
- * calculation is too heavy for everything to be done within a single access
- * period (~15 us).
- *
  * Called with local interrupts disabled.
  */
 static void omap_rtc_power_off(void)
@@ -434,6 +428,7 @@ static void omap_rtc_power_off(void)
 	struct omap_rtc *rtc = omap_rtc_power_off_rtc;
 	struct rtc_time tm;
 	unsigned long now;
+	int seconds;
 	u32 val;
 
 	rtc->type->unlock(rtc);
@@ -441,11 +436,13 @@ static void omap_rtc_power_off(void)
 	val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
 	rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN);
 
-	/* set alarm two seconds from now */
+again:
+	/* set alarm one second from now */
 	omap_rtc_read_time_raw(rtc, &tm);
+	seconds = tm.tm_sec;
 	bcd2tm(&tm);
 	rtc_tm_to_time(&tm, &now);
-	rtc_time_to_tm(now + 2, &tm);
+	rtc_time_to_tm(now + 1, &tm);
 
 	if (tm2bcd(&tm) < 0) {
 		dev_err(&rtc->rtc->dev, "power off failed\n");
@@ -470,14 +467,22 @@ static void omap_rtc_power_off(void)
 	val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
 	rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG,
 			val | OMAP_RTC_INTERRUPTS_IT_ALARM2);
+
+	/* Retry in case roll over happened before alarm was armed. */
+	if (rtc_read(rtc, OMAP_RTC_SECONDS_REG) != seconds) {
+		val = rtc_read(rtc, OMAP_RTC_STATUS_REG);
+		if (!(val & OMAP_RTC_STATUS_ALARM2))
+			goto again;
+	}
+
 	rtc->type->lock(rtc);
 
 	/*
-	 * Wait for alarm to trigger (within two seconds) and external PMIC to
+	 * Wait for alarm to trigger (within one second) and external PMIC to
 	 * power off the system. Add a 500 ms margin for external latencies
 	 * (e.g. debounce circuits).
 	 */
-	mdelay(2500);
+	mdelay(1500);
 }
 
 static const struct rtc_class_ops omap_rtc_ops = {
-- 
1.9.1

Re: [PATCH v6 2/2] rtc: omap: Cut down the shutdown time from 2 seconds to 1 sec

[Johan Hovold]

On Thu, Aug 16, 2018 at 10:39:00AM +0530, Keerthy wrote:
> Cut down the shutdown time from 2 seconds to 1 sec. In case of roll
> over try again.
> 
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> ---

You forgot to include a changelog, but it looks like you've addressed
the issues with v5, and this now looks good to me:

Reviewed-by: Johan Hovold <johan@kernel.org>

Johan

Re: [PATCH v6 1/2] rtc: omap: use of_device_is_system_power_controller function

[Alexandre Belloni]

On 16/08/2018 10:38:59+0530, Keerthy wrote:
> Use of_device_is_system_power_controller instead of manually reading
> the system-power-controller property from the device tree node.
> 
> Reviewed-by: Johan Hovold <johan@kernel.org>
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> ---
>  drivers/rtc/rtc-omap.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
Applied, thanks.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v6 2/2] rtc: omap: Cut down the shutdown time from 2 seconds to 1 sec

[Alexandre Belloni]

On 16/08/2018 10:39:00+0530, Keerthy wrote:
> Cut down the shutdown time from 2 seconds to 1 sec. In case of roll
> over try again.
> 
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> ---
>  drivers/rtc/rtc-omap.c | 25 +++++++++++++++----------
>  1 file changed, 15 insertions(+), 10 deletions(-)
> 
Applied, thanks.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com