linux-kernel - Re: [PATCH 2/5] ARM: bcm2835: Replace alt0/i2s

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Date:	Tue, 8 Mar 2016 15:24:34 +0700
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Eric Anholt <eric@...olt.net>
Cc:	linux-rpi-kernel <linux-rpi-kernel@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH 2/5] ARM: bcm2835: Replace alt0/i2s_alt[02] with standard groups.

On Sat, Feb 27, 2016 at 1:19 AM, Eric Anholt <eric@...olt.net> wrote:

> Since all of these pins were documented, we can use their names to
> explain what's going on.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>

> +       pinctrl-0 = <&i2c0_gpio0
> +                    &i2c1_gpio2
> +                    &gpclk0_gpio4
> +                    &gpclk1_gpio5
> +                    &spi0_gpio7
> +                    &pcm_gpio18
> +                    &pwm0_gpio40
> +                    &pwm1_gpio45
> +                    &gpioout
> +                    &alt3>;

Why are all of these done as hogs instead of being in pinctrl-0
"default" for the device that is using them? i2c1, gpclk0,
etc?

The only reason I see would be if they are unused or something.

Yours,
Linus Walleij