pinctrl: meson: add optional region for drive strength

On the G12a, there is a new 'region' to handle the drive-strength.
This is optional since the older do not have this.

Fixes: 29ae0952 ("pinctrl: meson-g12a: add pinctrl driver support")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/meson/pinctrl-meson.c

@@ -507,6 +507,12 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
 	if (IS_ERR(pc->reg_pullen))
 		pc->reg_pullen = pc->reg_pull;
 
+	pc->reg_ds = meson_map_resource(pc, gpio_np, "ds");
+	if (IS_ERR(pc->reg_ds)) {
+		dev_dbg(pc->dev, "ds registers not found - skipping\n");
+		pc->reg_ds = NULL;
+	}
+
 	return 0;
 }
 

drivers/pinctrl/meson/pinctrl-meson.h

@@ -120,6 +120,7 @@ struct meson_pinctrl {
 	struct regmap *reg_pullen;
 	struct regmap *reg_pull;
 	struct regmap *reg_gpio;
+	struct regmap *reg_ds;
 	struct gpio_chip chip;
 	struct device_node *of_node;
 };