linux-kernel - Re: [PATCH 12/18] gpio: add support for the sl28cpld GPIO controller

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Date:   Fri, 27 Mar 2020 11:20:56 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Michael Walle <michael@...le.cc>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-hwmon@...r.kernel.org,
        linux-pwm@...r.kernel.org,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 12/18] gpio: add support for the sl28cpld GPIO controller

On Thu, Mar 26, 2020 at 9:06 PM Michael Walle <michael@...le.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