[PATCH 3/7] iio: pressure: mpl115: Apply iwyu principles to includes

[Jonathan Cameron <jic23@kernel.org>]

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Motivated by fixing the new W=1 warning for lack of include of
linux/export.h this reworks all the includes for this driver
along the lines of approximate include what you use principles.

One question here is what to do about gfp_types.h.
For now I've added a rule to allow GFP_KERNEL to come from linux/slab.h
or linux/device.h (for devm_ calls).  In this driver slab.h is
never used directly so linux/device.h provides the symbol.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/pressure/mpl115.c     | 13 ++++++++++---
 drivers/iio/pressure/mpl115.h     |  1 +
 drivers/iio/pressure/mpl115_i2c.c |  8 +++++++-
 drivers/iio/pressure/mpl115_spi.c |  5 +++++
 4 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/pressure/mpl115.c b/drivers/iio/pressure/mpl115.c
index 71beb28b7f2c..448d030d5621 100644
--- a/drivers/iio/pressure/mpl115.c
+++ b/drivers/iio/pressure/mpl115.c
@@ -6,11 +6,18 @@
  *
  * TODO: synchronization with system suspend
  */
-
-#include <linux/module.h>
-#include <linux/iio/iio.h>
+#include <linux/array_size.h>
+#include <linux/bits.h>
 #include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/export.h>
 #include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+#include <linux/stddef.h>
+#include <linux/iio/iio.h>
 
 #include "mpl115.h"
 
diff --git a/drivers/iio/pressure/mpl115.h b/drivers/iio/pressure/mpl115.h
index 78a0068a17bb..480ee112f134 100644
--- a/drivers/iio/pressure/mpl115.h
+++ b/drivers/iio/pressure/mpl115.h
@@ -7,6 +7,7 @@
  */
 
 #include <linux/pm_runtime.h>
+#include <linux/types.h>
 
 #ifndef _MPL115_H_
 #define _MPL115_H_
diff --git a/drivers/iio/pressure/mpl115_i2c.c b/drivers/iio/pressure/mpl115_i2c.c
index 3db9ef4e2770..160cf1e5a317 100644
--- a/drivers/iio/pressure/mpl115_i2c.c
+++ b/drivers/iio/pressure/mpl115_i2c.c
@@ -9,11 +9,17 @@
  * Datasheet: http://www.nxp.com/files/sensors/doc/data_sheet/MPL115A2.pdf
  */
 
-#include <linux/module.h>
+#include <linux/errno.h>
 #include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/types.h>
 
 #include "mpl115.h"
 
+struct device;
+
 static int mpl115_i2c_init(struct device *dev)
 {
 	return 0;
diff --git a/drivers/iio/pressure/mpl115_spi.c b/drivers/iio/pressure/mpl115_spi.c
index 4e1d24beff94..26df328769a4 100644
--- a/drivers/iio/pressure/mpl115_spi.c
+++ b/drivers/iio/pressure/mpl115_spi.c
@@ -7,8 +7,13 @@
  * Datasheet: http://www.nxp.com/files/sensors/doc/data_sheet/MPL115A1.pdf
  */
 
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
+#include <linux/pm.h>
 #include <linux/spi/spi.h>
+#include <linux/types.h>
 
 #include "mpl115.h"
 
-- 
2.50.0