Linux-GPIO Archive on lore.kernel.org
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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Sungbo Eo <mans0n@gorani.run>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-gpio <linux-gpio@vger.kernel.org>
Subject: Re: [PATCH v2 1/2] gpio: add GPO driver for PCA9570
Date: Wed, 1 Jul 2020 00:23:48 +0300
Message-ID: <CAHp75VcA-kmJHyuZOMs-BDqhQ7FszZti=uHmSs-NCH2F6e_c4A@mail.gmail.com> (raw)
In-Reply-To: <c7fd2365-0f47-b2c8-4085-020928c79254@gorani.run>

On Tue, Jun 30, 2020 at 7:11 PM Sungbo Eo <mans0n@gorani.run> wrote:
>
> Thanks for all the reviews! I've updated the patch, please have a look.
>
> And I have something to ask.
>
> # echo 1 > gpio408/value
> # cat gpio408/value
> cat: read error: I/O error
> # cat gpio408/direction
> out
> # echo out > gpio408/direction
> # echo in > gpio408/direction
> [   91.006691] gpio-408 (sysfs): gpiod_direction_input: missing get()
> but have direction_input()
> ash: write error: I/O error
>
> I've never dealt with GPO expander before, so this seems a bit odd to me.
> Is it perfectly okay to leave get() and direction_input() unimplemented?

Actually it would be better to return the value you set for output in ->get().


-- 
With Best Regards,
Andy Shevchenko

      reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25  7:58 Sungbo Eo
2020-06-25  8:59 ` Andy Shevchenko
2020-06-25 14:43 ` kernel test robot
2020-06-25 16:38 ` kernel test robot
2020-06-30  9:18 ` Bartosz Golaszewski
2020-06-30  9:53   ` Andy Shevchenko
2020-06-30 16:11     ` Sungbo Eo
2020-06-30 21:23       ` Andy Shevchenko [this message]

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