diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2014-02-13 23:05:28 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-15 12:08:38 -0800 |
| commit | 0b336cea56ccd9949dc9bd6f24bd3bb9d212ffad (patch) | |
| tree | 95c6420fd909f80c06f2463b831b08d1d68dfb41 /drivers/w1 | |
| parent | c9afbb05a9ffbef0976242ab1135af6814ccff0f (diff) | |
| download | linux-0b336cea56ccd9949dc9bd6f24bd3bb9d212ffad.tar.bz2 | |
w1-gpio: handle of_get_gpio() returning -EPROBE_DEFER better
of_get_gpio() might return -EPROBE_DEFER meaning that the driver
providing the gpio isn't ready yet. If that happens for the first gpio
the resulting kernel output without this patch is:
w1-gpio somename: Failed to parse DT
platform somename: Driver w1-gpio requests probe deferral
The first message is misleading and so is suppressed with this patch.
Further if determining the gpio to switch the external pullup yields
-EPROBE_DEFER this error should be passed back to the caller instead of
just continuing without pullup.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/masters/w1-gpio.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c index 9709b8b484ba..1d111e56c8c8 100644 --- a/drivers/w1/masters/w1-gpio.c +++ b/drivers/w1/masters/w1-gpio.c @@ -89,11 +89,22 @@ static int w1_gpio_probe_dt(struct platform_device *pdev) pdata->is_open_drain = 1; gpio = of_get_gpio(np, 0); - if (gpio < 0) + if (gpio < 0) { + if (gpio != -EPROBE_DEFER) + dev_err(&pdev->dev, + "Failed to parse gpio property for data pin (%d)\n", + gpio); + return gpio; + } pdata->pin = gpio; - pdata->ext_pullup_enable_pin = of_get_gpio(np, 1); + gpio = of_get_gpio(np, 1); + if (gpio == -EPROBE_DEFER) + return gpio; + /* ignore other errors as the pullup gpio is optional */ + pdata->ext_pullup_enable_pin = gpio; + pdev->dev.platform_data = pdata; return 0; @@ -107,10 +118,8 @@ static int w1_gpio_probe(struct platform_device *pdev) if (of_have_populated_dt()) { err = w1_gpio_probe_dt(pdev); - if (err < 0) { - dev_err(&pdev->dev, "Failed to parse DT\n"); + if (err < 0) return err; - } } pdata = dev_get_platdata(&pdev->dev); |