gpiod_set_value_cansleep() needs it's declaration in the corresponding
header. This fixes build errors like

   drivers/input/touchscreen/st1232.c: In function 'st1232_ts_power':

quoted

drivers/input/touchscreen/st1232.c:146:3: error: implicit declaration of

   function 'gpiod_set_value_cansleep'; did you mean 'gpio_set_value_cansleep'?
   [-Werror=implicit-function-declaration]
      gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
      ^~~~~~~~~~~~~~~~~~~~~~~~
      gpio_set_value_cansleep

Signed-off-by: Martin Kepplinger <martink@posteo.de>
---

 drivers/input/touchscreen/st1232.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index 1fbc0847416b..f4b7a4f1c366 100644
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c

@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/pm_qos.h>
 #include <linux/slab.h>
 #include <linux/types.h>

-- 
2.20.1