linux-kernel - Re: [patch 2.6.20-rc2] gpio_direction

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Date:	02 Mar 2007 07:48:12 +0200
From:	Andrew Victor <andrew@...people.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Milan Svoboda <msvoboda@...rockwell.com>,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: Re: [patch 2.6.20-rc2] gpio_direction_output() needs an initial
	value

hi David,

> It's been pointed out that output GPIOs should have an initial value, to
> avoid signal glitching ... among other things, it can be some time before
> a driver is ready.  This patch corrects that oversight, fixing

For the AT91 changes:
  Acked-by: Andrew Victor <andrew@...people.com>


> --- g26.orig/drivers/spi/atmel_spi.c	2007-02-28 12:47:43.000000000 -0800
> +++ g26/drivers/spi/atmel_spi.c	2007-03-01 15:29:30.000000000 -0800

> -		gpio_direction_output(npcs_pin);
> +		gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
>  	}

As mentioned previously (by Walter Tuppa), wouldn't it be better to just
change this to:
     cs_deactivate(spi);


Regards,
  Andrew Victor


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