netdev - Re: [PATCH] mdio-mux-gpio: Use GPIO descriptor interface and new gpiod_set

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Date:	Tue, 25 Nov 2014 09:13:48 +0100
From:	Rojhalat Ibrahim <imr@...chenk.de>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>,
	David Daney <david.daney@...ium.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <acourbot@...dia.com>
Subject: Re: [PATCH] mdio-mux-gpio: Use GPIO descriptor interface and new gpiod_set_array function

On Tuesday 25 November 2014 12:39:13 Alexandre Courbot wrote:
> On Thu, Nov 20, 2014 at 9:24 PM, Rojhalat Ibrahim <imr@...chenk.de> wrote:
> > @@ -70,20 +64,17 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
> >         s->num_gpios = num_gpios;
> >
> >         for (n = 0; n < num_gpios; ) {
> > -               int gpio = of_get_gpio_flags(pdev->dev.of_node, n, &f);
> > -               if (gpio < 0) {
> > -                       r = (gpio == -ENODEV) ? -EPROBE_DEFER : gpio;
> > +               struct gpio_desc *gpio = gpiod_get_index(&pdev->dev,
> > +                                                        "mdio-mux-gpio", n);
> 
> Doesn't this change introduce some incompatibility against the current
> DT bindings? of_get_gpio_flags() looks for a "gpios" property, while
> your call to gpiod_get_index() will look for "mdio-mux-gpio-gpios". It
> should probably be changed to gpiod_get_index(&pdev->dev, NULL, n).
> 

You are right, of course. I'll fix it and post a new patch version.

> ... or even be changed to gpiod_get_index(&pdev->dev, NULL, n,
> GPIOD_OUT_LOW) as the calls to gpiod_get() functions are being updated
> to take an initial state (both variants are currently usable but the
> former one will disappear in the future). This will also allow you to
> get rid of your call to gpiod_direction_output().
> 

Will do that.

> Side-note: it would be nice to have a gpiod_get_array() call that does
> exactly what this loop does, and returns an array of gpios directly
> usable by gpiod_set_array*(). And a matching gpiod_put_array() of
> course.
> 

I'll add that to my to-do-list.


Thanks
   Rojhalat

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