linux-kernel - [patch 2.6.22-rc2-git] ads7846: SPI

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Message-Id: <200705221359.12410.david-b@pacbell.net>
Date:	Tue, 22 May 2007 13:59:11 -0700
From:	David Brownell <david-b@...bell.net>
To:	Dmitry Torokhov <dtor@...l.ru>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-input@...ey.karlin.mff.cuni.cz,
	Semih Hazar <semih.hazar@...efia.com>,
	Nicolas Ferre <nicolas.ferre@....atmel.com>,
	Tony Lindgren <tony@...mide.com>, imre.deak@...idboot.com
Subject: [patch 2.6.22-rc2-git] ads7846: SPI_CPHA mode bugfix

From: Semih Hazar <semih.hazar@...efia.com>

In commit [1] the SPI mode is set to 1, but it should be 0.  As stated
in the commit, ads784x samples the data on the rising edge.  SPI mode 1
samples on the falling edge [2] though.

The root cause of this is a bug in the omap_uwire code, which treats
CPHA=1 incorrectly; so these two bugs cancel each other out on one
of the main regression test platforms for this driver.

[1] kernel.org GIT 7937e86a70235e1584486654687dc9908a11e00a
[2] http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

---
 drivers/input/touchscreen/ads7846.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- g26.orig/drivers/input/touchscreen/ads7846.c	2007-05-20 21:08:30.000000000 -0700
+++ g26/drivers/input/touchscreen/ads7846.c	2007-05-20 21:08:54.000000000 -0700
@@ -847,7 +847,7 @@ static int __devinit ads7846_probe(struc
 	 * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 	 */
 	spi->bits_per_word = 8;
-	spi->mode = SPI_MODE_1;
+	spi->mode = SPI_MODE_0;
 	err = spi_setup(spi);
 	if (err < 0)
 		return err;
-
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