[PATCH 01/17] pinctrl: renesas: r906g032: handle pin subgroups

Add simple recursion support to the .set_state method. This makes it
possible to use subbroups in the device tree, which in turn allows
setting multiple pins with different bias/drive-strength properies.

Fixes: e4aea57fa773 ("pinctrl: renesas: add R906G032 driver")
Signed-off-by: Ralph Siemsen <[email protected]>
---
 drivers/pinctrl/renesas/pinctrl-rzn1.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzn1.c b/drivers/pinctrl/renesas/pinctrl-rzn1.c
index fdc43c8e714..8b13a2cea75 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzn1.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzn1.c
@@ -298,6 +298,7 @@ static int rzn1_pinconf_set(struct rzn1_pinctrl_priv *priv, unsigned int pin,
 static int rzn1_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 {
 	struct rzn1_pinctrl_priv *priv = dev_get_priv(dev);
+	struct udevice *child;
 	int size;
 	int ret;
 	u32 val;
@@ -317,8 +318,6 @@ static int rzn1_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 
 	/* Number of pins */
 	ret = dev_read_size(config, "pinmux");
-	if (ret < 0)
-		return ret;
 
 	size = ret / sizeof(val);
 
@@ -338,6 +337,18 @@ static int rzn1_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 		rzn1_hw_set_lock(priv, LOCK_ALL, 0);
 	}
 
+	/*
+	 * Handle subnodes recursively, so that pin groups work.
+	 * Note that properties are *NOT* inherited from parent.
+	 */
+	for (device_find_first_child(config, &child);
+	     child;
+	     device_find_next_child(&child)) {
+		ret = rzn1_pinctrl_set_state(dev, child);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 

-- 
2.55.0