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authorMarek Czerski <ma.czerski@gmail.com>2021-02-04 00:49:00 +0300
committerSebastian Reichel <sebastian.reichel@collabora.com>2021-04-05 13:05:51 +0300
commit52473b07401891fd963db44ca691ec9ec441546c (patch)
tree91a28f80a0524b8c1ef1f543662a94b5f4842254 /drivers/power
parent816aacd541df8e93f0d2f438b584b6a9560a25c7 (diff)
downloadlinux-52473b07401891fd963db44ca691ec9ec441546c.tar.xz
power: reset: ltc2952: make trigger delay configurable
Make trigger delay configurable through device tree with trigger-delay-ms property. Trigger delay is the time to wait before starting shutdown sequence after trigger line assertion. Trigger delay must take into account the OFFT time configured with the capacitor connected to OFFT pin of the LTC2952 chip. Basically, the higher the capacitance connected to OFFT pin, the larger trigger delay must be. Signed-off-by: Marek Czerski <ma.czerski@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/ltc2952-poweroff.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/power/reset/ltc2952-poweroff.c b/drivers/power/reset/ltc2952-poweroff.c
index 318927938b05..d1495af30081 100644
--- a/drivers/power/reset/ltc2952-poweroff.c
+++ b/drivers/power/reset/ltc2952-poweroff.c
@@ -55,6 +55,7 @@
#include <linux/mod_devicetable.h>
#include <linux/gpio/consumer.h>
#include <linux/reboot.h>
+#include <linux/property.h>
struct ltc2952_poweroff {
struct hrtimer timer_trigger;
@@ -172,10 +173,17 @@ static void ltc2952_poweroff_default(struct ltc2952_poweroff *data)
static int ltc2952_poweroff_init(struct platform_device *pdev)
{
int ret;
+ u32 trigger_delay_ms;
struct ltc2952_poweroff *data = platform_get_drvdata(pdev);
ltc2952_poweroff_default(data);
+ if (!device_property_read_u32(&pdev->dev, "trigger-delay-ms",
+ &trigger_delay_ms)) {
+ data->trigger_delay = ktime_set(trigger_delay_ms / MSEC_PER_SEC,
+ (trigger_delay_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
+ }
+
data->gpio_watchdog = devm_gpiod_get(&pdev->dev, "watchdog",
GPIOD_OUT_LOW);
if (IS_ERR(data->gpio_watchdog)) {