linux-kernel - [PATCH 3.12 056/175] gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node

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Message-Id: <dddaecc27d5dbc30863428edd7bab031e7c7c8d9.1426581621.git.jslaby@suse.cz>
Date:	Tue, 17 Mar 2015 09:40:34 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Hans Holmberg <hans.holmberg@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 056/175] gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node

From: Hans Holmberg <hans.holmberg@...el.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 9cf75e9e4ddd587ac12e88e8751c358b7b27e95f upstream.

The change:

7b8792bbdffdff3abda704f89c6a45ea97afdc62
gpiolib: of: Correct error handling in of_get_named_gpiod_flags

assumed that only one gpio-chip is registred per of-node.
Some drivers register more than one chip per of-node, so
adjust the matching function of_gpiochip_find_and_xlate to
not stop looking for chips if a node-match is found and
the translation fails.

Fixes: 7b8792bbdffd ("gpiolib: of: Correct error handling in of_get_named_gpiod_flags")
Signed-off-by: Hans Holmberg <hans.holmberg@...el.com>
Acked-by: Alexandre Courbot <acourbot@...dia.com>
Tested-by: Robert Jarzmik <robert.jarzmik@...e.fr>
Tested-by: Tyler Hall <tylerwhall@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpio/gpiolib-of.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 63e7fad69ced..836af49da901 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -44,12 +44,13 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
 
 	ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
 	if (ret < 0) {
-		/* We've found the gpio chip, but the translation failed.
-		 * Return true to stop looking and return the translation
-		 * error via out_gpio
+		/* We've found a gpio chip, but the translation failed.
+		 * Store translation error in out_gpio.
+		 * Return false to keep looking, as more than one gpio chip
+		 * could be registered per of-node.
 		 */
 		gg_data->out_gpio = ERR_PTR(ret);
-		return true;
+		return false;
 	 }
 
 	gg_data->out_gpio = ret + gc->base;
-- 
2.3.0

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