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

[Ralph Siemsen]

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 <ralph.siem...@linaro.org>
---
 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