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Date:	Mon, 5 Jan 2015 15:05:46 +0100
From:	Linus Walleij <>
To:	Krzysztof Kozlowski <>,
	Tomasz Figa <>
Cc:	Mike Turquette <>,
	Sylwester Nawrocki <>,
	Kukjin Kim <>,
	"" <>,
	linux-samsung-soc <>,
	Javier Martinez Canillas <>,
	"" <>,
	"" <>,
	Vivek Gautam <>,
	Kevin Hilman <>,
	Kyungmin Park <>,
	Marek Szyprowski <>,
	Bartlomiej Zolnierkiewicz <>
Subject: Re: [PATCH v4 2/3] pinctrl: exynos: Fix GPIO setup failure because
 domain clock being gated

On Fri, Dec 5, 2014 at 12:00 PM, Krzysztof Kozlowski
<> wrote:

> The audio subsystem on Exynos 5420 has separate clocks and GPIO. To
> operate properly on GPIOs the main block clock 'mau_epll' must be
> enabled.
> This was observed on Peach Pi/Pit and Arndale Octa (after enabling i2s0)
> after introducing runtime PM to pl330 DMA driver. After that commit the
> 'mau_epll' was gated, because the "amba" clock was disabled and there
> were no more users of mau_epll.
> The system hang just before probing i2s0 because
> samsung_pinmux_setup() tried to access memory from audss block which was
> gated.
> Add a clock property to the pinctrl driver and enable the clock during
> GPIO setup. During normal GPIO operations (set, get, set_direction) the
> clock is not enabled.
> Signed-off-by: Krzysztof Kozlowski <>
> Tested-by: Javier Martinez Canillas <>

Tomasz, is this OK and should I apply it for fixes or next?

Linus Walleij
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