[PATCH 3/4] pinctrl: add a generic way to map node to map for group based drivers

[Antoine Tenart]

This patch add a generic function to use a standard callback to
.dt_node_to_map for group based pinctrl drivers.

It parses nodes of the form:

        foo_pmux: foo-pmux {
                function = "foo";
                groups = "g0", "g1", "g2";
        }

Signed-off-by: Antoine Tenart <antoine.ten...@free-electrons.com>
---
 drivers/pinctrl/pinconf-generic.c       | 36 +++++++++++++++++++++++++++++++++
 include/linux/pinctrl/pinconf-generic.h |  3 +++
 2 files changed, 39 insertions(+)

diff --git a/drivers/pinctrl/pinconf-generic.c 
b/drivers/pinctrl/pinconf-generic.c
index 29ff77f90fcb..456902150226 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -336,4 +336,40 @@ int pinconf_generic_dt_node_to_map(struct pinctrl_dev 
*pctldev,
 }
 EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
 
+int pinconf_generic_function_groups_dt_node_to_map(struct pinctrl_dev *pctldev,
+               struct device_node *node, struct pinctrl_map **map,
+               unsigned *num_maps)
+{
+       struct property *prop;
+       unsigned reserved_maps = 0;
+       const char *function_name, *group_name;
+       int ngroups, ret;
+
+       *map = NULL;
+       *num_maps = 0;
+
+       ret = of_pinctrl_utils_read_function(pctldev, node, &function_name,
+                                            &ngroups);
+       if (ret)
+               return ret;
+
+       ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps,
+                                       ngroups);
+       if (ret)
+               return ret;
+
+       of_pinctrl_for_each_function_group(node, prop, group_name) {
+               ret = pinctrl_utils_add_map_mux(pctldev, map, &reserved_maps,
+                                               num_maps, group_name,
+                                               function_name);
+               if (ret) {
+                       dev_err(pctldev->dev, "cannot add map: %d\n", ret);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(pinconf_generic_function_groups_dt_node_to_map);
+
 #endif
diff --git a/include/linux/pinctrl/pinconf-generic.h 
b/include/linux/pinctrl/pinconf-generic.h
index a15f10727eb8..acda4b89596d 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -157,6 +157,9 @@ int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev 
*pctldev,
 int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
                struct device_node *np_config, struct pinctrl_map **map,
                unsigned *num_maps, enum pinctrl_map_type type);
+int pinconf_generic_function_groups_dt_node_to_map(struct pinctrl_dev *pctldev,
+               struct device_node *node, struct pinctrl_map **map,
+               unsigned *num_maps);
 
 static inline int pinconf_generic_dt_node_to_map_group(
                struct pinctrl_dev *pctldev, struct device_node *np_config,
-- 
1.9.1

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