pinctrl: renesas: rzg2l: Fix invalid unsigned return in rzg3s_oen_read()

rzg3s_oen_read() returns a u32 value, but previously propagated a negative
error code from rzg3s_pin_to_oen_bit(), resulting in an unintended large
positive value due to unsigned conversion. This caused incorrect
output-enable reporting for certain pins.

Without this patch, pins P1_0-P1_4 and P7_0-P7_4 are incorrectly reported
as "output enabled" in the pinconf-pins debugfs file. With this fix, only
P1_0-P1_1 and P7_0-P7_1 are shown as "output enabled", which matches the
hardware manual.

Fix this by returning 0 when the OEN bit lookup fails, treating the pin
as output-disabled by default.

Fixes: a9024a323af2 ("pinctrl: renesas: rzg2l: Clean up and refactor OEN read/write functions")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250709160819.306875-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index c52263c2a7b093fccdb38e44ff3fbba0a86d4def..22bc5b8f65fdee72adc71adf68150177ad324358 100644 (file)
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -1124,7 +1124,7 @@ static u32 rzg3s_oen_read(struct rzg2l_pinctrl *pctrl, unsigned int _pin)
 
        bit = rzg3s_pin_to_oen_bit(pctrl, _pin);
        if (bit < 0)
-               return bit;
+               return 0;
 
        return !(readb(pctrl->base + ETH_MODE) & BIT(bit));
 }