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gpiolib: of: fix lookup quirk for MIPS Lantiq

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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 transition 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: fbbbcd177a ("gpiolib: of: add quirk for locating reset lines with legacy bindings")
Fixes: 90c2d2eb7a ("MIPS: pci: lantiq: switch to using gpiod API")
Reported-by: Martin Schiller <ms@dev.tdt.de>
Acked-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/ZoLpqv1PN08xHioh@google.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Dmitry Torokhov 2024-07-01 10:38:50 -07:00 committed by Bartosz Golaszewski
parent 22a40d14b5
commit 3645ffaf2b
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpio/gpiolib-of.c
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@ -202,6 +202,16 @@ static void of_gpio_try_fixup_polarity(const struct device_node *np,
* helper, and be consistent with what other drivers do.
*/
{ "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
};
unsigned int i;
@ -504,9 +514,9 @@ 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
/*