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

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Date:	Fri, 25 Jul 2014 10:37:31 +0200
From:	Jiří Prchal <jiri.prchal@...ignal.cz>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	devicetree@...r.kernel.org, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org,
	Bo Shen <voice.shen@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: at91: at91sam9x5: sets NPCS0 (PA14) back to GPIO



Dne 25.7.2014 v 10:30 Alexandre Belloni napsal(a):
> Hi,
>
> On 25/07/2014 at 08:14:40 +0200, Jiří Prchal wrote :
>> I'm using custom board. My spi node:
>> 			spi0: spi@...00000 {
>
> 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@...ff400 {
> 				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.
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