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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Fri, 27 Mar 2020 11:20:56 +0100
Message-ID: <CACRpkdbJ3DBO+W4P0n-CfZ1T3L8d_L0Nizra8frkv92XPXR4WA@mail.gmail.com>
Subject: Re: [PATCH 12/18] gpio: add support for the sl28cpld GPIO controller
To:     Michael Walle <michael@walle.cc>
Cc:     Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        linux-gpio <linux-gpio@vger.kernel.org>,
        linux-devicetree <devicetree@vger.kernel.org>,
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        Lee Jones <lee.jones@linaro.org>,
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On Thu, Mar 26, 2020 at 9:06 PM Michael Walle <michael@walle.cc> wrote:
> Am 2020-03-25 12:50, schrieb Bartosz Golaszewski:

> > In that case maybe you should use the disable_locking option in
> > regmap_config and provide your own callbacks that you can use in the
> > irqchip code too?
>
> But how would that solve problem (1). And keep in mind, that the
> reqmap_irqchip is actually used for the interrupt controller, which
> is not this gpio controller.
>
> Ie. the interrupt controller of the sl28cpld uses the regmap_irqchip
> and all interrupt phandles pointing to the interrupt controller will
> reference the toplevel node. Any phandles pointing to the gpio
> controller will reference the GPIO subnode.

Ideally we would create something generic that has been on my
mind for some time, like a generic GPIO regmap irqchip now that
there are a few controllers like that.

I don't know how feasible it is or how much work it would be. But
as with GPIO_GENERIC (for MMIO) it would be helpful since we
can then implement things like .set_multiple() and .get_multiple()
for everyone.

Yours,
Linus Walleij