linux-kernel - Re: [PATCH v3 04/14] GPIO: Add gpio-ingenic driver

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Date:   Thu, 09 Feb 2017 18:14:32 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linux MIPS <linux-mips@...ux-mips.org>,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH v3 04/14] GPIO: Add gpio-ingenic driver

Hi,

> What some drivers do when they just get/set a bit in a register
> to get/set or set the direction of a GPIO, is to select GPIO_GENERIC
> and just bgpio_init() with the right iomem pointers, then the core
> will register handlers for get, set, set_direcition callback and
> get_direction and your driver can just focus on the remainders.

GPIO_GENERIC and bgpio_init() would work for my .set() / .get() 
callbacks,
not for my .direction_input() / .direction_output() callbacks which need
to set more than one register.

> If you're not just replacing these with GPIO_GENERIC, please also
> include a .get_direction() callback.

My .direction_input() and .direction_output() callbacks just call into
the pinctrl driver, using pinctrl_gpio_direction_[in,out]put().
I didn't find a way to get the direction info from the pinctrl driver,
is that something that the core should provide?

Thanks,
-Paul