pinctrl: Declare operation structures as const

The pinconf, pinctrl and pinmux operation structures hold function
pointers that are never modified. Declare them as const.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
index 4eb6d2c..f28d4b0 100644
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/pinctrl-bcm2835.c
@@ -795,7 +795,7 @@
 	return err;
 }
 
-static struct pinctrl_ops bcm2835_pctl_ops = {
+static const struct pinctrl_ops bcm2835_pctl_ops = {
 	.get_groups_count = bcm2835_pctl_get_groups_count,
 	.get_group_name = bcm2835_pctl_get_group_name,
 	.get_group_pins = bcm2835_pctl_get_group_pins,
@@ -872,7 +872,7 @@
 	return 0;
 }
 
-static struct pinmux_ops bcm2835_pmx_ops = {
+static const struct pinmux_ops bcm2835_pmx_ops = {
 	.get_functions_count = bcm2835_pmx_get_functions_count,
 	.get_function_name = bcm2835_pmx_get_function_name,
 	.get_function_groups = bcm2835_pmx_get_function_groups,
@@ -916,7 +916,7 @@
 	return 0;
 }
 
-static struct pinconf_ops bcm2835_pinconf_ops = {
+static const struct pinconf_ops bcm2835_pinconf_ops = {
 	.pin_config_get = bcm2835_pinconf_get,
 	.pin_config_set = bcm2835_pinconf_set,
 };