linux-kernel - Re: [PATCH v5 07/12] leds: leds-gpio: Add support for GPIO descriptors

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Message-ID: <20141030161528.GS1304@lahna.fi.intel.com>
Date:	Thu, 30 Oct 2014 18:15:28 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Aaron Lu <aaron.lu@...el.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v5 07/12] leds: leds-gpio: Add support for GPIO
 descriptors

On Thu, Oct 30, 2014 at 04:40:05PM +0100, Linus Walleij wrote:
> > Yes, I'll just let dust to settle before sending out a patch that
> > converts the existing users of platform_gpio_blink_set() callback to
> > gpio descriptors.
> 
> Dust settle = 2 weeks, 18 months, 5 years?

I started to do the conversion already but then noticed that it is not
that trivial after all.

For example we have one user in arch/arm/mach-orion5x/dns323-setup.c:

static struct gpio_led_platform_data dns323ab_led_data = {
	.num_leds       = ARRAY_SIZE(dns323ab_leds),
	.leds           = dns323ab_leds,
	.gpio_blink_set = orion_gpio_led_blink_set,
};

orion_gpio_led_blink_set() is part of orion specific custom GPIO
"driver" defined in arch/arm/plat-orion/gpio.c and as far as I can tell
cannot use GPIO descriptors as it directly programs these numbers to the
hardware.

We can convert the descriptor to a number in the beginning of
orion_gpio_led_blink_set() if that helps.

Other two users: rx1950_led_blink_set() and h1940_led_blink_set() seem
to have similar needs for the numeric value.

> Sorry for nagging but I've been *SO* burnt by people in the past
> saying they will "fix things later real soon" and then never get around
> to it.

Understood.

> But I guess I'm gonna trust you anyway.

Thanks :)
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