struct group_desc is a particular version of the struct pingroup
with associated opaque data. Start switching pin control core and
drivers to use it explicitly.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/pinctrl/core.c | 15 ++++++++++++---
 drivers/pinctrl/core.h |  5 +++++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 75f2689c3bad..48cc5571dea6 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -557,7 +557,10 @@ const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
 	if (!group)
 		return NULL;
 
-	return group->name;
+	if (group->name)
+		return group->name;
+
+	return group->grp.name;
 }
 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
 
@@ -583,8 +586,14 @@ int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
 		return -EINVAL;
 	}
 
-	*pins = group->pins;
-	*num_pins = group->num_pins;
+	if (group->pins) {
+		*pins = group->pins;
+		*num_pins = group->num_pins;
+		return 0;
+	}
+
+	*pins = group->grp.pins;
+	*num_pins = group->grp.npins;
 
 	return 0;
 }
diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h
index bf971e6a7846..a3b75ec7b54b 100644
--- a/drivers/pinctrl/core.h
+++ b/drivers/pinctrl/core.h
@@ -194,14 +194,18 @@ struct pinctrl_maps {
 
 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
 
+#include <linux/pinctrl/pinctrl.h>
+
 /**
  * struct group_desc - generic pin group descriptor
+ * @grp: generic data of the pin group (name and pins)
  * @name: name of the pin group
  * @pins: array of pins that belong to the group
  * @num_pins: number of pins in the group
  * @data: pin controller driver specific data
  */
 struct group_desc {
+	struct pingroup grp;
 	const char *name;
 	const unsigned int *pins;
 	int num_pins;
@@ -211,6 +215,7 @@ struct group_desc {
 /* Convenience macro to define a generic pin group descriptor */
 #define PINCTRL_GROUP_DESC(_name, _pins, _num_pins, _data)	\
 (struct group_desc) {						\
+	.grp = PINCTRL_PINGROUP(_name, _pins, _num_pins),	\
 	.name = _name,						\
 	.pins = _pins,						\
 	.num_pins = _num_pins,					\
-- 
2.43.0.rc1.1.gbec44491f096