linux-kernel - Re: [PATCH v3] pinctrl: spacemit: enable config option

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Message-ID: <CAMuHMdWM5ymPVRe36+Atr0cDAdRGyw39jFJvE+9PWTUUiiMfCg@mail.gmail.com>
Date: Mon, 17 Mar 2025 13:59:43 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Yixun Lan <dlan@...too.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Alex Elder <elder@...nel.org>, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, 
	spacemit@...ts.linux.dev, Conor Dooley <conor.dooley@...rochip.com>, 
	Alex Elder <elder@...cstar.com>
Subject: Re: [PATCH v3] pinctrl: spacemit: enable config option

Hi Yixun,

On Mon, 17 Mar 2025 at 13:41, Yixun Lan <dlan@...too.org> wrote:
> On 09:18 Mon 17 Mar     , Geert Uytterhoeven wrote:
> > Thanks for your patch, which is now commit 7ff4faba63571c51
> > ("pinctrl: spacemit: enable config option") in v6.14-rc7.
> >
> > On Tue, 18 Feb 2025 at 01:32, Yixun Lan <dlan@...too.org> wrote:
> > > Pinctrl is an essential driver for SpacemiT's SoC,
> > > The uart driver requires it, same as sd card driver,
> > > so let's enable it by default for this SoC.
> > >
> > > The CONFIG_PINCTRL_SPACEMIT_K1 isn't enabled when using
> > > 'make defconfig' to select kernel configuration options.
> > > This result in a broken uart driver where fail at probe()
> > > stage due to no pins found.
> >
> > Perhaps this is an issue with the uart driver?
> > I just disabled CONFIG_PINCTRL_RZA2 on RZA2MEVB (which is one of the
> > few Renesas platforms where the pin control driver is not enabled by
> > default, for saving memory), and the system booted fine into a Debian
> > nfsroot.  Probe order of some devices did change, and "Trying to
> > probe devices needed for running init" was printed.
> >
> my problem was CONFIG_PINCTRL_SPACEMIT_K1 isn't enabled, result as
> # CONFIG_PINCTRL_SPACEMIT_K1 is not set
>
> for your case, is CONFIG_PINCTRL_RZA2 built as module?
> it should work for uart driver with deferred probe mechanism..

No, CONFIG_PINCTRL_RZA2 was disabled in my testing.

> > > --- a/drivers/pinctrl/spacemit/Kconfig
> > > +++ b/drivers/pinctrl/spacemit/Kconfig
> > > @@ -4,9 +4,10 @@
> > >  #
> > >
> > >  config PINCTRL_SPACEMIT_K1
> > > -       tristate "SpacemiT K1 SoC Pinctrl driver"
> > > +       bool "SpacemiT K1 SoC Pinctrl driver"
> > >         depends on ARCH_SPACEMIT || COMPILE_TEST
> > >         depends on OF
> > > +       default y
> >
> > Ouch, fix sent...
> > "[PATCH] pinctrl: spacemit: PINCTRL_SPACEMIT_K1 should not default to
> > y unconditionally"
> > https://lore.kernel.org/6881b8d1ad74ac780af8a974e604b5ef3f5d4aad.1742198691.git.geert+renesas@glider.be
> >
> I got suggestion in v1
> https://lore.kernel.org/all/20250211-nature-kilt-9882e53e5a3f@spud/

Yeah, I read that, but only after I noticed the issue in v6.14-rc7.

> so for COMPILE_TEST case, ARCH_SPACEMIT config won't be enabled? then neither PINCTRL_SPACEMIT_K1
> anyway, I'm fine with either way, thanks
>
> > >         select GENERIC_PINCTRL_GROUPS
> > >         select GENERIC_PINMUX_FUNCTIONS
> > >         select GENERIC_PINCONF

It depends. ARCH_SPACEMIT can be enabled only when building for
RISC-V, while COMPILE_TEST can be enabled everywhere.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds