# \[PATCH v7 06/20\] pinctrl: Probe pinctrl devices on demand

- From: Tomeu Vizoso \<hidden\>
- Date: 2015-09-29 09:13:56 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2015/09/4585653
- Thread: https://ratatoskr.run/linux-arm-kernel/2015/09/4585647/t.md

```text
When looking up a pin controller through its OF node, probe it if it
hasn't already.

The goal is to reduce deferred probes to a minimum, as it makes it very
cumbersome to find out why a device failed to probe, and can introduce
very big delays in when a critical device is probed.

Signed-off-by: Tomeu Vizoso <redacted>
Acked-by: Linus Walleij <redacted>
---


 drivers/gpio/gpiolib-of.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 9a439dab7a87..05da9a56608d 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -359,6 +359,8 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 		if (ret)
 			break;
 
+		of_device_probe(pinspec.np);
+
 		pctldev = of_pinctrl_get(pinspec.np);
 		if (!pctldev)
 			return -EPROBE_DEFER;
-- 
2.4.3
```