pinctrl: Don't copy pin names when registering them

A pin controller's names array is no longer marked __refdata. Hence, we
can avoid copying a pin's name into the descriptor when registering it.
Instead, just point at the string supplied in the pin array.

This both simplifies and speeds up pin controller initialization, but
also removes the hard-coded maximum pin name length.

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

drivers/pinctrl/core.c

@@ -164,9 +164,8 @@ static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
 	/* Set owner */
 	pindesc->pctldev = pctldev;
 
-	/* Copy optional basic pin info */
-	if (name)
-		strlcpy(pindesc->name, name, sizeof(pindesc->name));
+	/* Copy basic pin info */
+	pindesc->name = name;
 
 	spin_lock(&pctldev->pin_desc_tree_lock);
 	radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);

drivers/pinctrl/core.h

@@ -55,7 +55,7 @@ struct pinctrl_dev {
  */
 struct pin_desc {
 	struct pinctrl_dev *pctldev;
-	char	name[16];
+	const char *name;
 	spinlock_t lock;
 	/* These fields only added when supporting pinmux drivers */
 #ifdef CONFIG_PINMUX