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Date:   Thu, 14 Oct 2021 16:34:37 +0530
From:   Shreeya Patel <>
        Shreeya Patel <>
Subject: [PATCH] gpio: Return EPROBE_DEFER if gc->to_irq is NULL

We are racing the registering of .to_irq when probing the
i2c driver. This results in random failure of touchscreen

Following errors could be seen in dmesg logs when gc->to_irq is NULL

[2.101857] i2c_hid i2c-FTS3528:00: HID over i2c has not been provided an Int IRQ
[2.101953] i2c_hid: probe of i2c-FTS3528:00 failed with error -22

To avoid this situation, defer probing until to_irq is registered.

This issue has been reported many times in past and people have been
using workarounds like changing the pinctrl_amd to built-in instead
of loading it as a module or by adding a softdep for pinctrl_amd into
the config file.

References :-

Signed-off-by: Shreeya Patel <>
 drivers/gpio/gpiolib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 27c07108496d..fc0ba85f4c45 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3084,7 +3084,7 @@ int gpiod_to_irq(const struct gpio_desc *desc)
 		return retirq;
-	return -ENXIO;
+	return -EPROBE_DEFER;

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