[PATCH v2] pinctrl: Check pinconfig nodes pre-reloc status recursively

[Jonas Karlman]

Pinconfig nodes normally bind recursively with PINCTRL_FULL and
PINCONF_RECURSIVE enabled. However, during U-Boot proper pre-relocation
any node marked with e.g. bootph-all will not bind unless its parent is
also marked for pre-reloc.

  group1 {
      pinconf1 {
          bootph-all;
      };
  };

This cause the following warning message to be shown during U-Boot
proper pre-reloc stage on Rockchip devices, e.g on RK3568:

  ns16550_serial serial at fe660000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19

and on RK3328:

  ns16550_serial serial at ff130000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19

Check pinconfig nodes pre-reloc status recursively to fix this and to
make pinconfig_post_bind work same at both U-Boot proper pre-reloc and
at TPL/SPL stage.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
v2:
- No change

A recent change to fdtgrep was believed to solve this however, fdtgrep
is only applied to control fdt for xPL so this issue still exist at
U-Boot proper pre-reloc stage.

Link to v1: https://patchwork.ozlabs.org/patch/1817296/
---
 drivers/pinctrl/pinctrl-uclass.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-uclass.c b/drivers/pinctrl/pinctrl-uclass.c
index 73dd7b1038bb..fe2ba5021a78 100644
--- a/drivers/pinctrl/pinctrl-uclass.c
+++ b/drivers/pinctrl/pinctrl-uclass.c
@@ -100,6 +100,22 @@ static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
 	return 0;
 }
 
+static bool ofnode_pre_reloc_recursive(ofnode parent)
+{
+	ofnode child;
+
+	if (ofnode_pre_reloc(parent))
+		return true;
+
+	if (CONFIG_IS_ENABLED(PINCONF_RECURSIVE)) {
+		ofnode_for_each_subnode(child, parent)
+			if (ofnode_pre_reloc_recursive(child))
+				return true;
+	}
+
+	return false;
+}
+
 /**
  * pinconfig_post_bind() - post binding for PINCONFIG uclass
  * Recursively bind its children as pinconfig devices.
@@ -119,7 +135,7 @@ static int pinconfig_post_bind(struct udevice *dev)
 
 	dev_for_each_subnode(node, dev) {
 		if (pre_reloc_only &&
-		    !ofnode_pre_reloc(node))
+		    !ofnode_pre_reloc_recursive(node))
 			continue;
 		/*
 		 * If this node has "compatible" property, this is not
-- 
2.43.0