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gpiolib: cdev: Add hardware timestamp clock type

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This patch adds new clock type for the GPIO controller which can
timestamp gpio lines in using hardware means. To expose such
functionalities to the userspace, code has been added where
during line create or set config API calls, it checks for new
clock type and if requested, calls HTE API. During line change
event, the HTE subsystem pushes timestamp data to userspace
through gpiolib-cdev.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dipen Patel 2022-04-22 13:52:18 -07:00 • committed by Thierry Reding
parent 10e4afd6cc
commit 2068339a6c
2 changed files with 222 additions and 33 deletions
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3
include/uapi/linux/gpio.h
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@ -66,6 +66,8 @@ struct gpiochip_info {
* @GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN: line has pull-down bias enabled
* @GPIO_V2_LINE_FLAG_BIAS_DISABLED: line has bias disabled
* @GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME: line events contain REALTIME timestamps
* @GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE: line events contain timestamps from
* hardware timestamp engine
*/
enum gpio_v2_line_flag {
GPIO_V2_LINE_FLAG_USED = _BITULL(0),
@ -80,6 +82,7 @@ enum gpio_v2_line_flag {
GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN = _BITULL(9),
GPIO_V2_LINE_FLAG_BIAS_DISABLED = _BITULL(10),
GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME = _BITULL(11),
GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE = _BITULL(12),
};
/**