From: Uwe Kleine-König Date: Thu, 13 Feb 2014 22:05:28 +0000 (+0100) Subject: w1-gpio: handle of_get_gpio() returning -EPROBE_DEFER better X-Git-Tag: v3.15-rc1~141^2~66 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0b336cea56ccd9949dc9bd6f24bd3bb9d212ffad;p=linux.git 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 Signed-off-by: Greg Kroah-Hartman --- 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);