[PATCH v7 05/20] gpio: Probe GPIO drivers on demand

From: Tomeu Vizoso
Date: Tue Sep 29 2015 - 05:15:00 EST

When looking up a gpiochip through its firmware 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 <tomeu.vizoso@xxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

drivers/gpio/gpiolib-of.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index fa6e3c8823d6..9a439dab7a87 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -19,6 +19,7 @@
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
@@ -95,6 +96,8 @@ struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
return ERR_PTR(ret);

+ of_device_probe(gg_data.gpiospec.np);
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);


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