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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Jean Delvare <khali@linux-fr.org>, Guenter Roeck <linux@roeck-us.net>
Cc: linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org
Subject: [PATCH 1/2] hwmon/lm70: Allow 4wire SPI bus with LM70
Date: Tue, 4 Sep 2012 10:40:44 +0200	[thread overview]
Message-ID: <201209040840.q848eiPg028975@localhost.localdomain> (raw)

Removing the 3wire limitation on LM70 as the component also allows
operation on 4wire SPI bus

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

diff -u linux-3.5-vanilla/drivers/hwmon/lm70.c linux-3.5/drivers/hwmon/lm70.c
--- linux-3.5-vanilla/drivers/hwmon/lm70.c	2012-07-21 22:58:29.000000000 +0200
+++ linux-3.5/drivers/hwmon/lm70.c	2012-08-25 00:35:40.000000000 +0200
@@ -143,10 +143,6 @@
 	if (spi->mode & (SPI_CPOL | SPI_CPHA))
 		return -EINVAL;
 
-	/* 3-wire link (shared SI/SO) for LM70 */
-	if (chip == LM70_CHIP_LM70 && !(spi->mode & SPI_3WIRE))
-		return -EINVAL;
-
 	/* NOTE:  we assume 8-bit words, and convert to 16 bits manually */
 
 	p_lm70 = kzalloc(sizeof *p_lm70, GFP_KERNEL);
diff -u linux-3.5-vanilla/Documentation/hwmon/lm70 linux-3.5/Documentation/hwmon/lm70
--- linux-3.5-vanilla/Documentation/hwmon/lm70	2012-07-21 22:58:29.000000000 +0200
+++ linux-3.5/Documentation/hwmon/lm70	2012-08-25 00:37:15.000000000 +0200
@@ -31,9 +31,8 @@
 with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
 and its associated documentation.
 
-The TMP121/TMP123 are very similar; main differences are 4 wire SPI inter-
-face (read only) and 13-bit temperature data (0.0625 degrees celsius reso-
-lution).
+The TMP121/TMP123 are very similar; main difference is 13-bit temperature
+data (0.0625 degrees celsius resolution).
 
 Thanks to
 ---------

             reply	other threads:[~2012-09-04  8:40 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04  8:40 Christophe Leroy [this message]
2012-09-04 16:28 ` Guenter Roeck

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