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

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Date:	Fri, 25 Jul 2014 12:06:30 +0200
From:	Jiří Prchal <jiri.prchal@...ignal.cz>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
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



Dne 25.7.2014 v 11:31 Boris BREZILLON napsal(a):
> 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
>
/ # devmem 0xfffff408
0xF0E04018
/ # devmem 0xfffff418
0xE0C04000
/ # devmem 0xfffff438
0x00C04000
/ # devmem 0xfffff43c
0x13FFD7FB
/ # devmem 0xfffff458
0x00000000
/ # devmem 0xfffff468
0xFF223B4E
/ # devmem 0xfffff470
0x0F000000
/ # devmem 0xfffff474
0x00000000
/ # devmem 0xfffff498
0xFFFFFFFF

I get thought if is possible that in time of probe fm25 (it's first) is not configured PA14 (it 's last)?
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