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Commit 19b0911d authored by Gustavo Solaira's avatar Gustavo Solaira
Browse files

pps-gpio: Add new property to use system time timestamp for PPS GPIO 



If the device tree property "use-system-time-ts" is defined
then the timestamp used for PPS events will be the system
time, otherwise it will be the monotonic boot time.

Change-Id: I92fab1d8861e1d652fcb68066b417f44c1f8e29b
Signed-off-by: default avatarGustavo Solaira <gustavos@codeaurora.org>
parent 8c88a114

Documentation/devicetree/bindings/pps/pps-gpio.txt

+3 −0
Original line number Diff line number Diff line
@@ -10,6 +10,9 @@ Required properties: 
Optional properties:

- assert-falling-edge: when present, assert is indicated by a falling edge

                       (instead of by a rising edge)

- use-system-time-ts: use the system time via pps_get_ts as the timestamp

                      if this is not defined then the timestamp will come

                      from the monotonic boot time



Example:

	pps {

drivers/pps/clients/pps-gpio.c

+10 −3
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ struct pps_gpio_device_data { 
	bool assert_falling_edge;

	bool capture_clear;

	unsigned int gpio_pin;

	bool use_system_time_ts;

};



/*
@@ -56,10 +57,13 @@ static irqreturn_t pps_gpio_irq_handler(int irq, void *data) 
	struct pps_event_time ts;

	int rising_edge;



	info = data;



	/* Get the time stamp first */

	if (!info->use_system_time_ts)

		get_monotonic_boottime(&ts.ts_real);



	info = data;

	else

		pps_get_ts(&ts);



	rising_edge = gpio_get_value(info->gpio_pin);

	if ((rising_edge && !info->assert_falling_edge) ||
@@ -119,6 +123,9 @@ static int pps_gpio_probe(struct platform_device *pdev) 


		if (of_get_property(np, "assert-falling-edge", NULL))

			data->assert_falling_edge = true;



		if (of_get_property(np, "use-system-time-ts", NULL))

			data->use_system_time_ts = true;

	}



	/* GPIO setup */