[PATCH v6 05/22] gpio: Probe GPIO drivers on demand

From	Tomeu Vizoso <tomeu.vizoso@collabora.com>
Newsgroups	linux.kernel
Subject	[PATCH v6 05/22] gpio: Probe GPIO drivers on demand
Date	2015-09-21 16:20 +0200
Message-ID	<qba6K-CY-17@gated-at.bofh.it> (permalink)
References	<qb9X3-rF-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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@collabora.com>
---


 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);
 
 	of_node_put(gg_data.gpiospec.np);
-- 
2.4.3

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Thread

[PATCH v6 0/22] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 14/22] usb: phy: Probe phy devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 09/22] drm: Probe panels on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 12/22] pwm: Probe PWM chip devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 01/22] driver core: handle -EPROBE_DEFER from bus_type.match() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 15/22] clk: Probe clk providers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 19/22] power-supply: Probe power supplies on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 20/22] driver core: Allow deferring probes until late init Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 16/22] pinctrl: Probe pinctrl devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 17/22] phy: core: Probe phy providers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 21/22] driver core: Start processing deferred probes earlier Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 07/22] regulator: core: Remove regulator_list Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
    Re: [PATCH v6 07/22] regulator: core: Remove regulator_list Mark Brown <broonie@kernel.org> - 2015-09-21 21:40 +0200
      Re: [PATCH v6 07/22] regulator: core: Remove regulator_list Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-22 09:30 +0200
  [PATCH v6 02/22] ARM: amba: Move reading of periphid to amba_match() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 04/22] of: add function to allow probing a device from a OF node Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 05/22] gpio: Probe GPIO drivers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 11/22] i2c: core: Probe i2c adapters and devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 06/22] gpio: Probe pinctrl devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200

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