linux-kernel - [PATCH v2 resend 0/4] sh: sh7722/sh7757i/sh7264/sh7269: Fix pinctrl registration

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Date:   Tue, 12 Sep 2017 10:40:53 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-sh@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 resend 0/4] sh: sh7722/sh7757i/sh7264/sh7269: Fix pinctrl registration

	Hi Andrew,

I'm resending this to you due to unresponsiveness from the SuperH
maintainers (v2 sent before on May 11, pinged on June 30 and August 14).

Magnus Damm reported that on sh7722/Migo-R, pinctrl registration fails
with:

    sh-pfc pfc-sh7722: pin 0 already registered
    sh-pfc pfc-sh7722: error during pin registration
    sh-pfc pfc-sh7722: could not register: -22
    sh-pfc: probe of pfc-sh7722 failed with error -22

pinmux_pins[] is initialized through PINMUX_GPIO(), using designated
array initializers, where the GPIO_* enums serve as indices.
Apparently GPIO_PTQ7 was defined in the enum, but never used.
If enum values are defined, but never used, pinmux_pins[] contains
(zero-filled) holes.  Hence such entries are treated as pin zero, which
was registered before, and pinctrl registration fails.

I can't see how this ever worked, as at the time of commit f5e25ae52feff2dc
("sh-pfc: Add sh7722 pinmux support"), pinmux_gpios[] in
drivers/pinctrl/sh-pfc/pfc-sh7722.c already had the hole, and
drivers/pinctrl/core.c already had the check.

Some scripting revealed a few more broken drivers:
  - sh7757 has four holes, due to nonexistent GPIO_PT[JLNQ]7_RESV.
  - sh7264 and sh7269 define GPIO_PH[0-7], but don't use it with
    PINMUX_GPIO().

Patch 1 fixes the issue on sh7722, and was tested.
Patches 3-4 should fix the issue on the other 3 SoCs, but was untested due
to lack of hardware.

Changes compared to v1:
  - Replace fake error messages by references to sh7722,
  - Add Reviewed-by, Tested-by.

Thanks for applying!

Geert Uytterhoeven (4):
  sh: sh7722: Remove nonexistent GPIO_PTQ7 to fix pinctrl registration
  sh: sh7757: Remove nonexistent GPIO_PT[JLNQ]7_RESV to fix pinctrl
    registration
  sh: sh7264: Remove nonexistent GPIO_PH[0-7] to fix pinctrl
    registration
  sh: sh7269: Remove nonexistent GPIO_PH[0-7] to fix pinctrl
    registration

 arch/sh/include/cpu-sh2a/cpu/sh7264.h | 4 +---
 arch/sh/include/cpu-sh2a/cpu/sh7269.h | 4 +---
 arch/sh/include/cpu-sh4/cpu/sh7722.h  | 2 +-
 arch/sh/include/cpu-sh4/cpu/sh7757.h  | 8 ++++----
 4 files changed, 7 insertions(+), 11 deletions(-)

-- 
2.7.4

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