linux-kernel - Re: [PATCH v2 2/3] gpiolib-of: Support 'reserved-gpio-ranges' property

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Date:   Thu, 01 Mar 2018 13:49:56 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Timur Tabi <timur@...eaurora.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Grant Likely <grant.likely@...retlab.ca>,
        linux-gpio@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/3] gpiolib-of: Support 'reserved-gpio-ranges' property

Quoting Linus Walleij (2018-02-07 05:34:19)
> Hi Stephen,
> 
> nice work!
> 
> On Fri, Jan 26, 2018 at 2:13 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> 
> > For now, we plumb this into the gpiochip irq APIs so that
> > GPIO/pinctrl drivers can use the gpiochip_irqchip_irq_valid() to
> > test validity of GPIOs.
> 
> But is that the right thing to do, given that we just took the
> trouble to define a DT binding that is explicitly about
> any GPIO, not just IRQ capable ones?
> 
> I am worries that the *irq* infix etc on these functions
> will be a bit confusing.
> 
> Is it a lot of work to make it just generic and maybe bake it
> into the gpio_chip so as to refuse already in
> gpiod_request_commit() in gpiolib already?

I don't think that it will be too much work to tweak the code to treat
these as gpios instead of irq lines. It may end up duplicating a bit of code
that the irq line stuff is already doing, but I'll take a stab at it and
see how bad it comes out.