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gpiolib: Add HTE support 

Some GPIO chip can provide hardware timestamp support on its GPIO lines
, in order to support that, additional API needs to be added which
can talk to both GPIO chip and HTE (hardware timestamping engine)
providers if there is any dependencies. This patch introduces optional
hooks to enable and disable hardware timestamping related features
in the GPIO controller chip.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dipen Patel 2022-04-22 13:52:16 -07:00 committed by Thierry Reding
parent e6a3a65be8
commit 42112dd77b
4 changed files with 83 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/gpio/gpiolib.c
View File

@ -2434,6 +2434,64 @@ set_output_flag:
}
EXPORT_SYMBOL_GPL(gpiod_direction_output);
/**
* gpiod_enable_hw_timestamp_ns - Enable hardware timestamp in nanoseconds.
*
* @desc: GPIO to enable.
* @flags: Flags related to GPIO edge.
*
* Return 0 in case of success, else negative error code.
*/
int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags)
{
int ret = 0;
struct gpio_chip *gc;
VALIDATE_DESC(desc);
gc = desc->gdev->chip;
if (!gc->en_hw_timestamp) {
gpiod_warn(desc, "%s: hw ts not supported\n", __func__);
return -ENOTSUPP;
}
ret = gc->en_hw_timestamp(gc, gpio_chip_hwgpio(desc), flags);
if (ret)
gpiod_warn(desc, "%s: hw ts request failed\n", __func__);
return ret;
}
EXPORT_SYMBOL_GPL(gpiod_enable_hw_timestamp_ns);
/**
* gpiod_disable_hw_timestamp_ns - Disable hardware timestamp.
*
* @desc: GPIO to disable.
* @flags: Flags related to GPIO edge, same value as used during enable call.
*
* Return 0 in case of success, else negative error code.
*/
int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags)
{
int ret = 0;
struct gpio_chip *gc;
VALIDATE_DESC(desc);
gc = desc->gdev->chip;
if (!gc->dis_hw_timestamp) {
gpiod_warn(desc, "%s: hw ts not supported\n", __func__);
return -ENOTSUPP;
}
ret = gc->dis_hw_timestamp(gc, gpio_chip_hwgpio(desc), flags);
if (ret)
gpiod_warn(desc, "%s: hw ts release failed\n", __func__);
return ret;
}
EXPORT_SYMBOL_GPL(gpiod_disable_hw_timestamp_ns);
/**
* gpiod_set_config - sets @config for a GPIO
* @desc: descriptor of the GPIO for which to set the configuration

1
drivers/gpio/gpiolib.h
View File

@ -158,6 +158,7 @@ struct gpio_desc {
#define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */
#define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */
#define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */
#define FLAG_EVENT_CLOCK_HTE 19 /* GPIO CDEV reports hardware timestamps in events */
/* Connection label */
const char *label;

16
include/linux/gpio/consumer.h
View File

@ -109,6 +109,8 @@ int gpiod_get_direction(struct gpio_desc *desc);
int gpiod_direction_input(struct gpio_desc *desc);
int gpiod_direction_output(struct gpio_desc *desc, int value);
int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
@ -350,8 +352,18 @@ static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
WARN_ON(desc);
return -ENOSYS;
}
static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
unsigned long flags)
{
WARN_ON(desc);
return -ENOSYS;
}
static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
unsigned long flags)
{
WARN_ON(desc);
return -ENOSYS;
}
static inline int gpiod_get_value(const struct gpio_desc *desc)
{
/* GPIO can never have been requested */

10
include/linux/gpio/driver.h
View File

@ -323,6 +323,10 @@ struct gpio_irq_chip {
* @add_pin_ranges: optional routine to initialize pin ranges, to be used when
* requires special mapping of the pins that provides GPIO functionality.
* It is called after adding GPIO chip and before adding IRQ chip.
* @en_hw_timestamp: Dependent on GPIO chip, an optional routine to
* enable hardware timestamp.
* @dis_hw_timestamp: Dependent on GPIO chip, an optional routine to
* disable hardware timestamp.
* @base: identifies the first GPIO number handled by this chip;
* or, if negative during registration, requests dynamic ID allocation.
* DEPRECATION: providing anything non-negative and nailing the base
@ -419,6 +423,12 @@ struct gpio_chip {
int (*add_pin_ranges)(struct gpio_chip *gc);
int (*en_hw_timestamp)(struct gpio_chip *gc,
u32 offset,
unsigned long flags);
int (*dis_hw_timestamp)(struct gpio_chip *gc,
u32 offset,
unsigned long flags);
int base;
u16 ngpio;
u16 offset;