| Message ID | Zn8CZ47e3LFncrDP@google.com |
|---|---|
| State | New |
| Headers | show |
| Series | gpiolib: of: fix lookup quirk for MIPS Lantiq | expand |
On Fri, Jun 28, 2024 at 8:35 PM Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote: > > As it turns out, there is a large number of out-of-tree DTSes (in > OpenWrt project) that used to specify incorrect (active high) polarity > for the Lantiq reset GPIO, so to keep compatibility while they are > being updated a quirk for force the polarity low is needed. Luckily > these old DTSes used nonstandard name for the property ("gpio-reset" vs > "reset-gpios") so the quirk will not hurt if there are any new devices > that need inverted polarity as they can specify the right polarity in > their DTS when using the standard "reset-gpios" property. > > Additionally the condition to enable the translation from standard to > non-standard reset GPIO property name was inverted and the replacement > name for the property was not correct. Fix this as well. > > Fixes: fbbbcd177a27 ("gpiolib: of: add quirk for locating reset lines with legacy bindings") > Fixes: 90c2d2eb7ab5 ("MIPS: pci: lantiq: switch to using gpiod API") > Reported-by: Martin Schiller <ms@dev.tdt.de> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> > --- > drivers/gpio/gpiolib-of.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c > index 59c7f8a2431a..d21085830632 100644 > --- a/drivers/gpio/gpiolib-of.c > +++ b/drivers/gpio/gpiolib-of.c > @@ -203,6 +203,16 @@ static void of_gpio_try_fixup_polarity(const struct device_node *np, > */ > { "qi,lb60", "rb-gpios", true }, > #endif > +#if IS_ENABLED(CONFIG_PCI_LANTIQ) > + /* > + * According to the PCI specification, the RST# pin is an > + * active-low signal. However, most of the device trees that > + * have been widely used for a long time incorrectly describe > + * reset GPIO as active-high, and were also using wrong name > + * for the property. > + */ > + { "lantiq,pci-xway", "gpio-reset", false }, > +#endif > #if IS_ENABLED(CONFIG_TOUCHSCREEN_TSC2005) > /* > * DTS for Nokia N900 incorrectly specified "active high" > @@ -512,9 +522,9 @@ static struct gpio_desc *of_find_gpio_rename(struct device_node *np, > { "reset", "reset-n-io", "marvell,nfc-uart" }, > { "reset", "reset-n-io", "mrvl,nfc-uart" }, > #endif > -#if !IS_ENABLED(CONFIG_PCI_LANTIQ) > +#if IS_ENABLED(CONFIG_PCI_LANTIQ) > /* MIPS Lantiq PCI */ > - { "reset", "gpios-reset", "lantiq,pci-xway" }, > + { "reset", "gpio-reset", "lantiq,pci-xway" }, > #endif > > /* > -- > 2.45.2.803.g4e1b14247a-goog > > > -- > Dmitry Can you rebase it on top of v6.10-rc6? It doesn't apply to my fixes branch. Bart
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 59c7f8a2431a..d21085830632 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -203,6 +203,16 @@ static void of_gpio_try_fixup_polarity(const struct device_node *np, */ { "qi,lb60", "rb-gpios", true }, #endif +#if IS_ENABLED(CONFIG_PCI_LANTIQ) + /* + * According to the PCI specification, the RST# pin is an + * active-low signal. However, most of the device trees that + * have been widely used for a long time incorrectly describe + * reset GPIO as active-high, and were also using wrong name + * for the property. + */ + { "lantiq,pci-xway", "gpio-reset", false }, +#endif #if IS_ENABLED(CONFIG_TOUCHSCREEN_TSC2005) /* * DTS for Nokia N900 incorrectly specified "active high" @@ -512,9 +522,9 @@ static struct gpio_desc *of_find_gpio_rename(struct device_node *np, { "reset", "reset-n-io", "marvell,nfc-uart" }, { "reset", "reset-n-io", "mrvl,nfc-uart" }, #endif -#if !IS_ENABLED(CONFIG_PCI_LANTIQ) +#if IS_ENABLED(CONFIG_PCI_LANTIQ) /* MIPS Lantiq PCI */ - { "reset", "gpios-reset", "lantiq,pci-xway" }, + { "reset", "gpio-reset", "lantiq,pci-xway" }, #endif /*
As it turns out, there is a large number of out-of-tree DTSes (in OpenWrt project) that used to specify incorrect (active high) polarity for the Lantiq reset GPIO, so to keep compatibility while they are being updated a quirk for force the polarity low is needed. Luckily these old DTSes used nonstandard name for the property ("gpio-reset" vs "reset-gpios") so the quirk will not hurt if there are any new devices that need inverted polarity as they can specify the right polarity in their DTS when using the standard "reset-gpios" property. Additionally the condition to enable the translation from standard to non-standard reset GPIO property name was inverted and the replacement name for the property was not correct. Fix this as well. Fixes: fbbbcd177a27 ("gpiolib: of: add quirk for locating reset lines with legacy bindings") Fixes: 90c2d2eb7ab5 ("MIPS: pci: lantiq: switch to using gpiod API") Reported-by: Martin Schiller <ms@dev.tdt.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> --- drivers/gpio/gpiolib-of.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)