When dt_to_map_one_config() is called with a pinctrl_dev passed
in, it should only be using this if the node being looked up
is a hog. The code was always using the passed pinctrl_dev
without checking whether the dt node referred to it.
A pin controller can have pinctrl-n dependencies on other pin
controllers in these cases:
- the pin controller hardware is external, for example I2C, so
needs other pin controller(s) to be setup to communicate with
the hardware device.
- it is a child of a composite MFD so its of_node is shared with
the parent MFD and other children of that MFD. Any part of that
MFD could have dependencies on other pin controllers.
Because of this, dt_to_map_one_config() can't assume that if it
has a pinctrl_dev passed in then the node it looks up must be
a hog. It could be a reference to some other pin controller.
Signed-off-by: Richard Fitzgerald <r...@opensource.cirrus.com>
---
drivers/pinctrl/devicetree.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index 1ff6c3573493..b601039d6c69 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -122,8 +122,10 @@ static int dt_to_map_one_config(struct pinctrl *p,
/* OK let's just assume this will appear later then */
return -EPROBE_DEFER;
}
- if (!pctldev)
- pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
+ /* If we're creating a hog we can use the passed pctldev */
+ if (pctldev && (np_pctldev == p->dev->of_node))
+ break;
+ pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
if (pctldev)
break;
/* Do not defer probing of hogs (circular loop) */
--
2.11.0
