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

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Message-ID: <CAMuHMdV4xWLEuCvCC54GBfCdELE=QSHqaOyUPD-ezE0QLYRnVA@mail.gmail.com>
Date: Mon, 17 Mar 2025 09:18:19 +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,

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.

> Fixes: a83c29e1d145 ("pinctrl: spacemit: add support for SpacemiT K1 SoC")
> Reported-by: Alex Elder <elder@...nel.org>
> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> Tested-by: Alex Elder <elder@...cstar.com>
> Signed-off-by: Yixun Lan <dlan@...too.org>

> --- 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

>         select GENERIC_PINCTRL_GROUPS
>         select GENERIC_PINMUX_FUNCTIONS
>         select GENERIC_PINCONF

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