linux-kernel - [PATCH 0/2] gpio: aggregator: Misc parsing improvements

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Date:   Tue, 23 Jun 2020 16:57:46 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 0/2] gpio: aggregator: Misc parsing improvements

	Hi Linus, Bartosz, Andy,

This patch series contains two improvements for the parsing code in the
GPIO Aggregator.

The second one converts the driver to use bitmap_parselist() for parsing
GPIO offsets and/or ranges, as suggested by Andy[1].
Note that I'm not super happy with the mask[] array on the stack.  But
there is no real limit on the number of GPIO lines provided by a single
gpiochip, except for the global ARCH_NR_GPIOS.

I also considered getting rid of the custom isrange() function.
However, the check for "!isrange(offsets)" cannot be replaced by a check
for bitmap_parselist() returning -EINVAL, as bitmap_parselist() happily
accepts an empty list.  Hence I'm afraid isrange() has to stay.

Andy also suggested to use strstrip() in get_arg().  However, I see no
point in that, as get_arg() has to find the end of the actual parameter
anyway.

Thanks for your comments!

[1] https://lore.kernel.org/r/20200520121420.GA1867563@smile.fi.intel.com

Geert Uytterhoeven (2):
  gpio: aggregator: Drop pre-initialization in get_arg()
  gpio: aggregator: Use bitmap_parselist() for parsing GPIO offsets

 drivers/gpio/gpio-aggregator.c | 46 ++++++++++++----------------------
 1 file changed, 16 insertions(+), 30 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