sh-pfc: Add DT support
Support device instantiation through the device tree. The compatible
property is used to select the SoC pinmux information.
Set the gpio_chip device field to the PFC device to enable automatic
GPIO OF support.
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index 3492ec9..7e32bb8 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -14,7 +14,9 @@
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
@@ -72,11 +74,125 @@
seq_printf(s, "%s", DRV_NAME);
}
+static int sh_pfc_dt_subnode_to_map(struct device *dev, struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned int *num_maps, unsigned int *index)
+{
+ struct pinctrl_map *maps = *map;
+ unsigned int nmaps = *num_maps;
+ unsigned int idx = *index;
+ const char *function = NULL;
+ struct property *prop;
+ const char *group;
+ int ret;
+
+ /* Parse the function and configuration properties. At least a function
+ * or one configuration must be specified.
+ */
+ ret = of_property_read_string(np, "renesas,function", &function);
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(dev, "Invalid function in DT\n");
+ return ret;
+ }
+
+ if (!function) {
+ dev_err(dev, "DT node must contain at least one function\n");
+ goto done;
+ }
+
+ /* Count the number of groups and reallocate mappings. */
+ ret = of_property_count_strings(np, "renesas,groups");
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(dev, "Invalid pin groups list in DT\n");
+ goto done;
+ }
+
+ if (!ret) {
+ dev_err(dev, "No group provided in DT node\n");
+ ret = -ENODEV;
+ goto done;
+ }
+
+ nmaps += ret;
+
+ maps = krealloc(maps, sizeof(*maps) * nmaps, GFP_KERNEL);
+ if (maps == NULL) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ *map = maps;
+ *num_maps = nmaps;
+
+ /* Iterate over pins and groups and create the mappings. */
+ of_property_for_each_string(np, "renesas,groups", prop, group) {
+ maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
+ maps[idx].data.mux.group = group;
+ maps[idx].data.mux.function = function;
+ idx++;
+ }
+
+ ret = 0;
+
+done:
+ *index = idx;
+ return ret;
+}
+
+static void sh_pfc_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *map, unsigned num_maps)
+{
+ kfree(map);
+}
+
+static int sh_pfc_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map, unsigned *num_maps)
+{
+ struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+ struct device *dev = pmx->pfc->dev;
+ struct device_node *child;
+ unsigned int index;
+ int ret;
+
+ *map = NULL;
+ *num_maps = 0;
+ index = 0;
+
+ for_each_child_of_node(np, child) {
+ ret = sh_pfc_dt_subnode_to_map(dev, child, map, num_maps,
+ &index);
+ if (ret < 0)
+ goto done;
+ }
+
+ /* If no mapping has been found in child nodes try the config node. */
+ if (*num_maps == 0) {
+ ret = sh_pfc_dt_subnode_to_map(dev, np, map, num_maps, &index);
+ if (ret < 0)
+ goto done;
+ }
+
+ if (*num_maps)
+ return 0;
+
+ dev_err(dev, "no mapping found in node %s\n", np->full_name);
+ ret = -EINVAL;
+
+done:
+ if (ret < 0)
+ sh_pfc_dt_free_map(pctldev, *map, *num_maps);
+
+ return ret;
+}
+
static const struct pinctrl_ops sh_pfc_pinctrl_ops = {
.get_groups_count = sh_pfc_get_groups_count,
.get_group_name = sh_pfc_get_group_name,
.get_group_pins = sh_pfc_get_group_pins,
.pin_dbg_show = sh_pfc_pin_dbg_show,
+ .dt_node_to_map = sh_pfc_dt_node_to_map,
+ .dt_free_map = sh_pfc_dt_free_map,
};
static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)