linux-kernel - [PATCH v6 05/11] iio: expose iio_device_set

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Message-Id: <20200324202736.243314-6-gwendal@chromium.org>
Date:   Tue, 24 Mar 2020 13:27:30 -0700
From:   Gwendal Grignou <gwendal@...omium.org>
To:     bleung@...omium.org, enric.balletbo@...labora.com,
        Jonathan.Cameron@...wei.com
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gwendal Grignou <gwendal@...omium.org>
Subject: [PATCH v6 05/11] iio: expose iio_device_set_clock

Some IIO devices may want to override the default (realtime) to another
clock source by default.
It can beneficial when timestamps coming from the hardware or underlying
drivers are already in that format.
It can always be overridden by attribute current_timestamp_clock.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
---
Changes in v6:
- No changes.
Changes in v5:
- New in v5.

 drivers/iio/industrialio-core.c | 8 +++++++-
 include/linux/iio/iio.h         | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 65ff0d0670188..26e963483bab0 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -189,7 +189,12 @@ ssize_t iio_read_const_attr(struct device *dev,
 }
 EXPORT_SYMBOL(iio_read_const_attr);
 
-static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
+/**
+ * iio_device_set_clock() - Set current timestamping clock for the device
+ * @indio_dev: IIO device structure containing the device
+ * @clock_id: timestamping clock posix identifier to set.
+ */
+int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
 {
 	int ret;
 	const struct iio_event_interface *ev_int = indio_dev->event_interface;
@@ -207,6 +212,7 @@ static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
 
 	return 0;
 }
+EXPORT_SYMBOL(iio_device_set_clock);
 
 /**
  * iio_get_time_ns() - utility function to get a time stamp for events etc
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 862ce0019eba5..b18f34a8901f3 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -627,6 +627,8 @@ static inline clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
 	return indio_dev->clock_id;
 }
 
+int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id);
+
 /**
  * dev_to_iio_dev() - Get IIO device struct from a device struct
  * @dev: 		The device embedded in the IIO device
-- 
2.25.1.696.g5e7596f4ac-goog