pinctrl: core device tree mapping table parsing support
During pinctrl_get(), if the client device has a device tree node, look
for the common pinctrl properties there. If found, parse the referenced
device tree nodes, with the help of the pinctrl drivers, and generate
mapping table entries from them.
During pinctrl_put(), free any results of device tree parsing.
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index df6296c..832f71d 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -26,6 +26,7 @@
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/machine.h>
#include "core.h"
+#include "devicetree.h"
#include "pinmux.h"
#include "pinconf.h"
@@ -45,7 +46,7 @@
DEFINE_MUTEX(pinctrl_mutex);
/* Global list of pin control devices (struct pinctrl_dev) */
-static LIST_HEAD(pinctrldev_list);
+LIST_HEAD(pinctrldev_list);
/* List of pin controller handles (struct pinctrl) */
static LIST_HEAD(pinctrl_list);
@@ -579,6 +580,13 @@
}
p->dev = dev;
INIT_LIST_HEAD(&p->states);
+ INIT_LIST_HEAD(&p->dt_maps);
+
+ ret = pinctrl_dt_to_map(p);
+ if (ret < 0) {
+ kfree(p);
+ return ERR_PTR(ret);
+ }
devname = dev_name(dev);
@@ -662,6 +670,8 @@
kfree(state);
}
+ pinctrl_dt_free_maps(p);
+
if (inlist)
list_del(&p->node);
kfree(p);
@@ -787,15 +797,8 @@
}
EXPORT_SYMBOL_GPL(pinctrl_select_state);
-/**
- * pinctrl_register_mappings() - register a set of pin controller mappings
- * @maps: the pincontrol mappings table to register. This should probably be
- * marked with __initdata so it can be discarded after boot. This
- * function will perform a shallow copy for the mapping entries.
- * @num_maps: the number of maps in the mapping table
- */
-int pinctrl_register_mappings(struct pinctrl_map const *maps,
- unsigned num_maps)
+int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
+ bool dup, bool locked)
{
int i, ret;
struct pinctrl_maps *maps_node;
@@ -851,20 +854,52 @@
}
maps_node->num_maps = num_maps;
- maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, GFP_KERNEL);
- if (!maps_node->maps) {
- pr_err("failed to duplicate mapping table\n");
- kfree(maps_node);
- return -ENOMEM;
+ if (dup) {
+ maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
+ GFP_KERNEL);
+ if (!maps_node->maps) {
+ pr_err("failed to duplicate mapping table\n");
+ kfree(maps_node);
+ return -ENOMEM;
+ }
+ } else {
+ maps_node->maps = maps;
}
- mutex_lock(&pinctrl_mutex);
+ if (!locked)
+ mutex_lock(&pinctrl_mutex);
list_add_tail(&maps_node->node, &pinctrl_maps);
- mutex_unlock(&pinctrl_mutex);
+ if (!locked)
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
+/**
+ * pinctrl_register_mappings() - register a set of pin controller mappings
+ * @maps: the pincontrol mappings table to register. This should probably be
+ * marked with __initdata so it can be discarded after boot. This
+ * function will perform a shallow copy for the mapping entries.
+ * @num_maps: the number of maps in the mapping table
+ */
+int pinctrl_register_mappings(struct pinctrl_map const *maps,
+ unsigned num_maps)
+{
+ return pinctrl_register_map(maps, num_maps, true, false);
+}
+
+void pinctrl_unregister_map(struct pinctrl_map const *map)
+{
+ struct pinctrl_maps *maps_node;
+
+ list_for_each_entry(maps_node, &pinctrl_maps, node) {
+ if (maps_node->maps == map) {
+ list_del(&maps_node->node);
+ return;
+ }
+ }
+}
+
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)
@@ -1231,6 +1266,9 @@
!ops->get_group_pins)
return -EINVAL;
+ if (ops->dt_node_to_map && !ops->dt_free_map)
+ return -EINVAL;
+
return 0;
}