linux-kernel - Re: [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO

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Date:	Fri, 25 Jul 2014 11:31:10 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	jiri.prchal@...ignal.cz
Cc:	Bo Shen <voice.shen@...el.com>, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO

On Fri, 25 Jul 2014 11:13:51 +0200
Jiří Prchal <jiri.prchal@...ignal.cz> wrote:


> >
> > Every thing seems in place.
> > Could you enable CONFIG_DEBUG_PINCTRL and grep on "enable pin" ?
> / # dmesg | grep "enable pin"
> [    0.968750] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 101 as GPIO
> [    0.968750] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 101 as PIOD5 0x20
> [    0.968750] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 100 as GPIO
> [    0.968750] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 100 as PIOD4 0x10
> [    1.238281] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 23 as GPIO
> [    1.238281] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 23 as PIOA23 0x800000
> [    1.238281] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 22 as GPIO
> [    1.238281] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 22 as PIOA22 0x400000
> [    1.242187] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 93 as GPIO
> [    1.242187] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 93 as PIOC29 0x20000000
> [    1.246093] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 14 as GPIO
> [    1.246093] pinctrl-at91 ahb:apb:pinctrl@...ff400: enable pin 14 as PIOA14 0x4000


Okay, this cleary shows that PA14 pin is muxed as a GPIO (or at least
the driver think it is).


Could you launch these commands (you'll need the devmem tool) and
paste the results ?

#devmem 0xfffff408
#devmem 0xfffff418
#devmem 0xfffff438
#devmem 0xfffff43c
#devmem 0xfffff458
#devmem 0xfffff468
#devmem 0xfffff470
#devmem 0xfffff474
#devmem 0xfffff498

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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