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pps: pps-gpio PPS ECHO implementation

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This patch implements the PPS ECHO functionality for pps-gpio, that
sysfs claims is available already.

Configuration is done via device tree bindings.

No changes are made to userspace interfaces.

This patch was originally written by Lukas Senger as part of a masters
thesis project and modified for inclusion into the linux kernel by Tom
Burkart.

Link: http://lkml.kernel.org/r/20190324043305.6627-4-tom@aussec.com
Signed-off-by: Tom Burkart <tom@aussec.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Lukas Senger <lukas@fridolin.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tom Burkart
2019-05-14 15:45:46 -07:00
committed by Linus Torvalds
parent 652e22185a
commit 4c69add45f
2 changed files with 87 additions and 3 deletions
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2
include/linux/pps-gpio.h
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@@ -24,8 +24,10 @@
struct pps_gpio_platform_data {
struct gpio_desc *gpio_pin;
struct gpio_desc *echo_pin;
bool assert_falling_edge;
bool capture_clear;
unsigned int echo_active_ms;
};
#endif /* _PPS_GPIO_H */