linux-kernel - Re: [PATCH] gpiolib: of: fix lookup quirk for MIPS Lantiq

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Date: Mon, 1 Jul 2024 10:51:00 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Martin Schiller <ms@....tdt.de>, 
	Hauke Mehrtens <hauke@...ke-m.de>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpiolib: of: fix lookup quirk for MIPS Lantiq

On Fri, Jun 28, 2024 at 8:35 PM Dmitry Torokhov
<dmitry.torokhov@...il.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@....tdt.de>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.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