linux-kernel - [PATCH v2 0/2] gpio: of: Add DT overlay support for GPIO hogs

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Date:   Thu, 20 Feb 2020 14:01:47 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Chris Brandt <chris.brandt@...esas.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 0/2] gpio: of: Add DT overlay support for GPIO hogs

	Hi all,

As GPIO hogs are configured at GPIO controller initialization time,
adding/removing GPIO hogs in Device Tree overlays currently does not
work.  Hence this patch series adds support for that, by registering an
of_reconfig notifier, as is already done for platform, i2c, and SPI
devices.

Changes compared to v1[1]:
  - Drop RFC state,
  - Document that modifying existing gpio-hog nodes is not supported.

After I posted v1, Frank created a unittest[2] to demonstrate the
problem, and to verify to my series fixes it (thanks a lot!).

Thanks!

[1] "[PATCH/RFC 0/2] gpio: of: Add DT overlay support for GPIO hogs"
    https://lore.kernel.org/r/20191230133852.5890-1-geert+renesas@glider.be/
[2] "[RFC PATCH 0/2] of: unittest: add overlay gpio test to catch gpio hog
     problem"
    https://lore.kernel.org/r/1579070828-18221-1-git-send-email-frowand.list@gmail.com/

Geert Uytterhoeven (2):
  gpio: of: Extract of_gpiochip_add_hog()
  gpio: of: Add DT overlay support for GPIO hogs

 drivers/gpio/gpiolib-of.c | 139 +++++++++++++++++++++++++++++++++-----
 drivers/gpio/gpiolib-of.h |   2 +
 drivers/gpio/gpiolib.c    |  14 +++-
 drivers/gpio/gpiolib.h    |   3 +
 4 files changed, 139 insertions(+), 19 deletions(-)

-- 
2.17.1

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