[PATCH 3/3] gpio: delay: fix offset propagation in gpio_delay_xlate()

[Pranav Sanwal]

gpio_delay_xlate() indexed priv->descs[] correctly using
args->args[0], but never propagated that same index into
desc->offset. Since gpio_desc_init() initializes offset to 0 before
xlate() runs, every consumer's returned descriptor ended up with
offset 0 regardless of which index it actually requested.

On boards where gpio-delay wraps more than one real GPIO line, this
caused every consumer past the first to silently collide with the
first consumer's already-claimed offset 0 in dm_gpio_request(),
which returns -EBUSY. The second consumer's real GPIO line was
therefore never toggled.

Fix gpio_delay_xlate() to record the requested index into
desc->offset so each consumer's descriptor is routed to the correct
underlying real GPIO.

Fixes: c866f2f197e2 ("gpio: Add GPIO delay driver")
Signed-off-by: Pranav Sanwal <pranav.sanwal at amd.com>
---
 drivers/gpio/gpio-delay.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-delay.c b/drivers/gpio/gpio-delay.c
index 533e7d2f8ef..f6c9c7efb0b 100644
--- a/drivers/gpio/gpio-delay.c
+++ b/drivers/gpio/gpio-delay.c
@@ -77,6 +77,8 @@ static int gpio_delay_xlate(struct udevice *dev, struct gpio_desc *desc,
 	if (args->args[0] >= uc_priv->gpio_count)
 		return -EINVAL;
 
+	desc->offset = args->args[0];
+
 	struct gpio_delay_desc *d = &priv->descs[args->args[0]];
 
 	d->ramp_up_us = args->args[1];
-- 
2.34.1