}
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