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power: reset: gpio-poweroff: add ability to specific active and inactive delays 

Similar to gpio-reset allow to specify active and inactive delays
while keeping the 100ms defaults that were used previously all the time.

The dt-properties are named the same as in gpio-reset but get an "-ms"
suffix as properties should contain such a suffix specifying its unit.

Signed-off-by: Heiko Stuebner <heiko.stuebner@bq.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
hifive-unleashed-5.1
Heiko Stuebner 2018-11-11 22:45:38 +01:00 committed by Sebastian Reichel
parent a53a68cee8
commit 76ee875c2f
2 changed files with 10 additions and 2 deletions
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2
Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
View File

@ -27,6 +27,8 @@ Optional properties:
it to an output when the power-off handler is called. If this optional
property is not specified, the GPIO is initialized as an output in its
inactive state.
- active-delay-ms: Delay (default 100) to wait after driving gpio active
- inactive-delay-ms: Delay (default 100) to wait after driving gpio inactive
- timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is
specified, 3000 ms is used.

10
drivers/power/reset/gpio-poweroff.c
View File

@ -26,6 +26,8 @@
*/
static struct gpio_desc *reset_gpio;
static u32 timeout = DEFAULT_TIMEOUT_MS;
static u32 active_delay = 100;
static u32 inactive_delay = 100;
static void gpio_poweroff_do_poweroff(void)
{
@ -33,10 +35,11 @@ static void gpio_poweroff_do_poweroff(void)
/* drive it active, also inactive->active edge */
gpiod_direction_output(reset_gpio, 1);
mdelay(100);
mdelay(active_delay);
/* drive inactive, also active->inactive edge */
gpiod_set_value_cansleep(reset_gpio, 0);
mdelay(100);
mdelay(inactive_delay);
/* drive it active, also inactive->active edge */
gpiod_set_value_cansleep(reset_gpio, 1);
@ -66,6 +69,9 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
else
flags = GPIOD_OUT_LOW;
device_property_read_u32(&pdev->dev, "active-delay-ms", &active_delay);
device_property_read_u32(&pdev->dev, "inactive-delay-ms",
&inactive_delay);
device_property_read_u32(&pdev->dev, "timeout-ms", &timeout);
reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);