diff options
| author | Brian Masney <masneyb@onstation.org> | 2018-11-11 04:34:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-21 12:34:30 +0300 |
| commit | e79749f4f034a393c8d1a0cd706c7268f57d6a3f (patch) | |
| tree | eb3fc838ff3c429455e6e5fcb15220713ad28b43 /drivers | |
| parent | 8eee80a70a2bda85439ce6412b8f48867f9e3d50 (diff) | |
| download | linux-e79749f4f034a393c8d1a0cd706c7268f57d6a3f.tar.xz | |
pinctrl: qcom: ssbi-gpio: fix gpio-hog related boot issues
[ Upstream commit 7ed07855773814337b9814f1c3e866df52ebce68 ]
When attempting to setup up a gpio hog, device probing will repeatedly
fail with -EPROBE_DEFERED errors. It is caused by a circular dependency
between the gpio and pinctrl frameworks. If the gpio-ranges property is
present in device tree, then the gpio framework will handle the gpio pin
registration and eliminate the circular dependency.
See Christian Lamparter's commit a86caa9ba5d7 ("pinctrl: msm: fix
gpio-hog related boot issues") for a detailed commit message that
explains the issue in much more detail. The code comment in this commit
came from Christian's commit.
I did not test this change against any hardware supported by this
particular driver, however I was able to validate this same fix works
for pinctrl-spmi-gpio.c using a LG Nexus 5 (hammerhead) phone.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c b/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c index b1e8a2d905ff..a0904e426c73 100644 --- a/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c +++ b/drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c @@ -755,12 +755,23 @@ static int pm8xxx_gpio_probe(struct platform_device *pdev) goto unregister_pinctrl; } - ret = gpiochip_add_pin_range(&pctrl->chip, - dev_name(pctrl->dev), - 0, 0, pctrl->chip.ngpio); - if (ret) { - dev_err(pctrl->dev, "failed to add pin range\n"); - goto unregister_gpiochip; + /* + * For DeviceTree-supported systems, the gpio core checks the + * pinctrl's device node for the "gpio-ranges" property. + * If it is present, it takes care of adding the pin ranges + * for the driver. In this case the driver can skip ahead. + * + * In order to remain compatible with older, existing DeviceTree + * files which don't set the "gpio-ranges" property or systems that + * utilize ACPI the driver has to call gpiochip_add_pin_range(). + */ + if (!of_property_read_bool(pctrl->dev->of_node, "gpio-ranges")) { + ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), + 0, 0, pctrl->chip.ngpio); + if (ret) { + dev_err(pctrl->dev, "failed to add pin range\n"); + goto unregister_gpiochip; + } } platform_set_drvdata(pdev, pctrl); |