linux-kernel - Re: [PATCH v4 07/10] arm64: select HAVE_SHARED_GPIOS for ARCH

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Message-ID: <CAMRc=MdQ8QgbdAd2sudZLgcDZu9DxBRJh5sfLeXwcTDEE0F7Uw@mail.gmail.com>
Date: Wed, 26 Nov 2025 15:54:12 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jon Hunter <jonathanh@...dia.com>
Cc: Kees Cook <kees@...nel.org>, Mika Westerberg <westeri@...nel.org>, 
	Dmitry Torokhov <dmitry.torokhov@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Manivannan Sadhasivam <mani@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Saravana Kannan <saravanak@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Andy Shevchenko <andy@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Srinivas Kandagatla <srini@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
	Alexey Klimov <alexey.klimov@...aro.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, linux-hardening@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-sound@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 07/10] arm64: select HAVE_SHARED_GPIOS for ARCH_QCOM

On Wed, Nov 26, 2025 at 3:51 PM Jon Hunter <jonathanh@...dia.com> wrote:
>
>
> On 26/11/2025 14:28, Bartosz Golaszewski wrote:
> > On Wed, Nov 26, 2025 at 3:24 PM Jon Hunter <jonathanh@...dia.com> wrote:
> >>
> >> Hi Bartosz,
> >>
> >> On 12/11/2025 13:55, Bartosz Golaszewski wrote:
> >>> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >>>
> >>> Some qualcomm platforms use shared GPIOs. Enable support for them by
> >>> selecting the Kconfig switch provided by GPIOLIB.
> >>>
> >>> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> >>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >>> ---
> >>>    arch/arm64/Kconfig.platforms | 1 +
> >>>    1 file changed, 1 insertion(+)
> >>>
> >>> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> >>> index 13173795c43d4f28e2d47acc700f80a165d44671..3dbff0261f0add0516d8cb3fd0f29e277af94f20 100644
> >>> --- a/arch/arm64/Kconfig.platforms
> >>> +++ b/arch/arm64/Kconfig.platforms
> >>> @@ -316,6 +316,7 @@ config ARCH_QCOM
> >>>        select GPIOLIB
> >>>        select PINCTRL
> >>>        select HAVE_PWRCTRL if PCI
> >>> +     select HAVE_SHARED_GPIOS
> >>>        help
> >>>          This enables support for the ARMv8 based Qualcomm chipsets.
> >>>
> >>
> >> I have noticed the following kernel warning on our Tegra platforms ...
> >>
> >>    ERR KERN OF: /__symbols__: could not find phandle 794981747
> >>
> >> Bisect is pointing to this commit and reverting this does prevent it. I
> >> am not sure if anyone else has seen this?
> >>
> >
> > I assume it comes from drivers/of/base.c:1295 - could you please post
> > a stack trace of how you're getting there?
>
> Yes looks like it does and I see ...
>
> [    0.123356] OF: /__symbols__: could not find phandle 794981747
> [    0.123401] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc7-next-20251126-00002-g1cd98992c487-dirty #19 PREEMPT
> [    0.123418] Hardware name: NVIDIA Jetson AGX Xavier Developer Kit (DT)
> [    0.123447] Call trace:
> [    0.123453]  show_stack+0x18/0x24 (C)
> [    0.123472]  dump_stack_lvl+0x74/0x8c
> [    0.123487]  dump_stack+0x18/0x24
> [    0.123518]  of_phandle_iterator_next+0x18c/0x1c4
> [    0.123536]  of_count_phandle_with_args+0xa0/0xc8
> [    0.123551]  gpio_shared_of_traverse+0xb8/0x47c
> [    0.123566]  gpio_shared_of_traverse+0x158/0x47c
> [    0.123578]  gpio_shared_init+0x110/0x1f0
> [    0.123595]  do_one_initcall+0x7c/0x1c0
> [    0.123607]  kernel_init_freeable+0x204/0x2e0
> [    0.123622]  kernel_init+0x20/0x1d8
> [    0.123637]  ret_from_fork+0x10/0x20
>

Is the device-tree used here upstream? Can you enable DEBUG_GPIO in
Kconfig and post the entire kernel log on pastebin?

Bartosz