linux-kernel - [PATCH v2 08/22] gpio: Probe pinctrl devices on demand

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Date:	Tue, 28 Jul 2015 15:19:39 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-acpi@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-gpio@...r.kernel.org, Alexandre Courbot <gnurou@...il.com>
Subject: [PATCH v2 08/22] gpio: Probe pinctrl devices on demand

When looking up a pin controller 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@...labora.com>
---

Changes in v2: None

 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 31a6b18a6542..2a6379c1fea7 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -358,6 +358,8 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 		if (ret)
 			break;
 
+		fwnode_ensure_device(&pinspec.np->fwnode);
+
 		pctldev = of_pinctrl_get(pinspec.np);
 		if (!pctldev)
 			return -EPROBE_DEFER;
-- 
2.4.3

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