[3.16.y-ckt stable] Patch "gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Mar 19 10:11:49 UTC 2015

This is a note to let you know that I have just added a patch titled

    gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.16.7-ckt9.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see



>From cd61acb7bc7790ec3869095b07a12fa37092e86d Mon Sep 17 00:00:00 2001
From: Hans Holmberg <hans.holmberg at intel.com>
Date: Tue, 10 Feb 2015 09:48:27 +0100
Subject: gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one
 chip per node

commit 9cf75e9e4ddd587ac12e88e8751c358b7b27e95f upstream.

The change:

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 at intel.com>
Acked-by: Alexandre Courbot <acourbot at nvidia.com>
Tested-by: Robert Jarzmik <robert.jarzmik at free.fr>
Tested-by: Tyler Hall <tylerwhall at gmail.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 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 8f9f0ad91445..621e1b50a092 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -46,12 +46,13 @@ 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 = gpiochip_get_desc(gc, ret);

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