[PATCH] iio: fix header includes across multiple drivers

[Caio Morais]

From: Caio Morais <caiomorais em usp.br>

Remove unnecessary includes and add missing ones as reported by the
include-what-you-use (IWYU) tool.

Files changed:
- drivers/iio/adc/xilinx-xadc-events.c
- drivers/iio/buffer/industrialio-triggered-buffer.c
- drivers/iio/common/st_sensors/st_sensors_i2c.c
- drivers/iio/common/st_sensors/st_sensors_spi.c

Signed-off-by: Caio Morais <caiomorais em usp.br>
---
 drivers/iio/adc/xilinx-xadc-events.c               | 5 ++++-
 drivers/iio/buffer/industrialio-triggered-buffer.c | 5 +++--
 drivers/iio/common/st_sensors/st_sensors_i2c.c     | 6 ++++--
 drivers/iio/common/st_sensors/st_sensors_spi.c     | 8 ++++++--
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/xilinx-xadc-events.c b/drivers/iio/adc/xilinx-xadc-events.c
index c188d3dca..d16e61953 100644
--- a/drivers/iio/adc/xilinx-xadc-events.c
+++ b/drivers/iio/adc/xilinx-xadc-events.c
@@ -6,9 +6,12 @@
  *  Author: Lars-Peter Clausen <lars em metafoo.de>
  */
 
+#include <linux/bitmap.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
 #include <linux/iio/events.h>
 #include <linux/iio/iio.h>
-#include <linux/kernel.h>
 
 #include "xilinx-xadc.h"
 
diff --git a/drivers/iio/buffer/industrialio-triggered-buffer.c b/drivers/iio/buffer/industrialio-triggered-buffer.c
index 9bf75dee7..601a26398 100644
--- a/drivers/iio/buffer/industrialio-triggered-buffer.c
+++ b/drivers/iio/buffer/industrialio-triggered-buffer.c
@@ -4,9 +4,10 @@
  *  Author: Lars-Peter Clausen <lars em metafoo.de>
  */
 
-#include <linux/kernel.h>
-#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
 #include <linux/module.h>
+#include <linux/stddef.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/buffer_impl.h>
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
index 7156302fe..6ab143498 100644
--- a/drivers/iio/common/st_sensors/st_sensors_i2c.c
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -7,11 +7,13 @@
  * Denis Ciocca <denis.ciocca em st.com>
  */
 
+#include <linux/device.h>
+#include <linux/err.h>
 #include <linux/i2c.h>
-#include <linux/kernel.h>
+#include <linux/linkage.h>
 #include <linux/module.h>
-#include <linux/iio/iio.h>
 #include <linux/regmap.h>
+#include <linux/iio/iio.h>
 
 #include <linux/iio/common/st_sensors_i2c.h>
 
diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
index 0da270139..c4b6dbc44 100644
--- a/drivers/iio/common/st_sensors/st_sensors_spi.c
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -7,12 +7,16 @@
  * Denis Ciocca <denis.ciocca em st.com>
  */
 
-#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
 #include <linux/iio/iio.h>
+#include <linux/linkage.h>
+#include <linux/module.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/spi/spi.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
 
 #include <linux/iio/common/st_sensors_spi.h>
 
-- 
2.53.0