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authorBen Dooks <ben.dooks@codethink.co.uk>2014-03-13 14:37:38 +0000
committerWolfram Sang <wsa@the-dreams.de>2014-03-13 22:16:43 +0100
commit40e7b1153a39e49715a1f75c654d8da66e3638c4 (patch)
treeee3aefe23650c22a0f5a15d5bc581165e8547cf8 /drivers/i2c
parent8a325997d95d446206b204b7859e055a0315e4fa (diff)
downloadop-kernel-dev-40e7b1153a39e49715a1f75c654d8da66e3638c4.zip
op-kernel-dev-40e7b1153a39e49715a1f75c654d8da66e3638c4.tar.gz
i2c: gpio: OF gpio code does not handle defered probe case
When using device-tree and the i2c-gpio driver is called before the GPIO node has been probed then it needs to correctly defer the probe instead of returning a permanent error that the gpio numbers are not valid. This fixes the following error: /i2c@2: invalid GPIO pins, sda=-517/scl=-517 Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-gpio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index d9f7e18..02d2d4a 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -94,6 +94,9 @@ static int of_i2c_gpio_get_pins(struct device_node *np,
*sda_pin = of_get_gpio(np, 0);
*scl_pin = of_get_gpio(np, 1);
+ if (*sda_pin == -EPROBE_DEFER || *scl_pin == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
if (!gpio_is_valid(*sda_pin) || !gpio_is_valid(*scl_pin)) {
pr_err("%s: invalid GPIO pins, sda=%d/scl=%d\n",
np->full_name, *sda_pin, *scl_pin);
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