linux-kernel - [PATCH v3 1/6] regmap: add support for 7

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Message-Id: <1331757790-10583-2-git-send-email-marc@cpdesign.com.au>
Date:	Thu, 15 Mar 2012 07:43:05 +1100
From:	Marc Reilly <marc@...esign.com.au>
To:	sameo@...ux.intel.com
Cc:	linux-arm-kernel@...ts.infradead.org,
	spi-devel-general@...ts.sourceforge.net, linux-i2c@...r.kernel.org,
	u.kleine-koenig@...gutronix.de, oskar@...ra.com,
	linux-kernel@...r.kernel.org, broonie@...nsource.wolfsonmicro.com,
	Marc Reilly <marc@...esign.com.au>
Subject: [PATCH v3 1/6] regmap: add support for 7_25 format

This adds support for devices with 7 address bits and 25 data bits.
The initial intended user for this are the mc13xxx mfds in spi mode.
(The 25th data bit is actually a dummy bit)

Signed-off-by: Marc Reilly <marc@...esign.com.au>
---
 drivers/base/regmap/regmap.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index be10a4f..62ef0df 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -100,6 +100,14 @@ static void regmap_format_10_14_write(struct regmap *map,
 	out[0] = reg >> 2;
 }
 
+static void regmap_format_7_25_write(struct regmap *map,
+				    unsigned int reg, unsigned int val)
+{
+	__be32 *out = map->work_buf;
+
+	*out = (reg << 25) | val;
+}
+
 static void regmap_format_8(void *buf, unsigned int val)
 {
 	u8 *b = buf;
@@ -193,6 +201,9 @@ struct regmap *regmap_init(struct device *dev,
 		case 9:
 			map->format.format_write = regmap_format_7_9_write;
 			break;
+		case 25:
+			map->format.format_write = regmap_format_7_25_write;
+			break;
 		default:
 			goto err_map;
 		}
-- 
1.7.3.4

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