From: jiri.prchal@aksignal.cz (Jiří Prchal)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO
Date: Fri, 25 Jul 2014 10:59:03 +0200 [thread overview]
Message-ID: <53D21C57.3010805@aksignal.cz> (raw)
In-Reply-To: <20140725085436.GF9532@piout.net>
Dne 25.7.2014 v 10:54 Alexandre Belloni napsal(a):
> On 25/07/2014 at 10:37:31 +0200, Ji?? Prchal wrote :
>>
>>
>> Dne 25.7.2014 v 10:30 Alexandre Belloni napsal(a):
>>> Hi,
>>>
>>> On 25/07/2014 at 08:14:40 +0200, Ji?? Prchal wrote :
>>>> I'm using custom board. My spi node:
>>>> spi0: spi at f0000000 {
>>>
>>> You should override the pinctrl here as you are using gpios for the cs.
>>> pinctrl-0 = <&pinctrl_spi0_custom>;
>>>
>>>> status = "okay";
>>>> cs-gpios = <&pioA 23 0
>>>> &pioA 22 0
>>>> &pioC 29 0
>>>> &pioA 14 0>;
>>>>
>>>
>>> pinctrl at fffff400 {
>>> spi0 {
>>> pinctrl_spi0_custom: spi0-custom {
>>> atmel,pins =
>>> <AT91_PIOA 23 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>,
>>> <AT91_PIOA 22 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>,
>>> <AT91_PIOC 29 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>,
>>> <AT91_PIOA 14 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>>> };
>>> };
>>> };
>>>
>> Of course, it's the way, but in all other drivers, for example LEDS,
>> it's not needed. And in other way, if I will not use PA14 at all,
>> the pin will goes down every spi transfer.
>
> You must not assumed that the pins are muxed to their default state
> which is gpio and you should set the pinctrl accordingly for each
> device.
>
> If you don't use PA14 at all, then you don't really care about its
> state...
Yes and no, what about on board is populated some chip on PA14, but for some reason at this time I don't need it and not
defined in DT?
>
>
next prev parent reply other threads:[~2014-07-25 8:59 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-11 10:22 [PATCH] ARM: at91: at91sam9x5: add clocks for usb device Bo Shen
2014-07-11 10:47 ` Alexandre Belloni
2014-07-11 10:55 ` Jiří Prchal
2014-07-24 13:38 ` [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO Jiří Prchal
2014-07-24 14:26 ` Boris BREZILLON
2014-07-24 15:06 ` Jiří Prchal
2014-07-24 15:58 ` Boris BREZILLON
2014-07-25 6:14 ` Jiří Prchal
2014-07-25 7:53 ` Boris BREZILLON
2014-07-25 8:27 ` Jiří Prchal
2014-07-25 8:45 ` Boris BREZILLON
2014-07-25 8:54 ` Jiří Prchal
2014-07-25 9:01 ` Boris BREZILLON
2014-07-25 9:13 ` Jiří Prchal
2014-07-25 9:31 ` Boris BREZILLON
2014-07-25 10:06 ` Jiří Prchal
2014-07-25 10:18 ` Boris BREZILLON
2014-07-25 10:32 ` Jiří Prchal
2014-07-25 11:34 ` Boris BREZILLON
2014-07-25 8:33 ` Jiří Prchal
2014-07-25 8:30 ` Alexandre Belloni
2014-07-25 8:36 ` Boris BREZILLON
2014-07-25 8:50 ` Alexandre Belloni
2014-07-25 8:37 ` Jiří Prchal
2014-07-25 8:54 ` Alexandre Belloni
2014-07-25 8:59 ` Jiří Prchal [this message]
2014-07-25 9:02 ` Alexandre Belloni
2014-07-25 9:10 ` Boris BREZILLON
2014-07-25 9:40 ` Jiří Prchal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53D21C57.3010805@aksignal.cz \
--to=jiri.prchal@aksignal.cz \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).