pinctrl: move group lookup to core

Now also the core needs to look up pin groups so move the lookup
function there and expose it in the internal header.

Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index eadef9e191ea..9970590006d1 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -284,6 +284,37 @@ void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
 	mutex_unlock(&pctldev->gpio_ranges_lock);
 }
 
+/**
+ * pinctrl_get_group_selector() - returns the group selector for a group
+ * @pctldev: the pin controller handling the group
+ * @pin_group: the pin group to look up
+ */
+int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
+			       const char *pin_group)
+{
+	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+	unsigned group_selector = 0;
+
+	while (pctlops->list_groups(pctldev, group_selector) >= 0) {
+		const char *gname = pctlops->get_group_name(pctldev,
+							    group_selector);
+		if (!strcmp(gname, pin_group)) {
+			dev_dbg(&pctldev->dev,
+				"found group selector %u for %s\n",
+				group_selector,
+				pin_group);
+			return group_selector;
+		}
+
+		group_selector++;
+	}
+
+	dev_err(&pctldev->dev, "does not have pin group %s\n",
+		pin_group);
+
+	return -EINVAL;
+}
+
 #ifdef CONFIG_DEBUG_FS
 
 static int pinctrl_pins_show(struct seq_file *s, void *what)