linux-kernel - [PATCH 3.16 003/133] iio: magnetometer: st_magn_core: enable multiread by default for LIS3MDL

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Message-ID: <lsq.1511315892.539282865@decadent.org.uk>
Date:   Wed, 22 Nov 2017 01:58:12 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Lorenzo Bianconi" <lorenzo.bianconi83@...il.com>,
        "Jonathan Cameron" <jic23@...nel.org>,
        "Lorenzo Bianconi" <lorenzo.bianconi@...com>
Subject: [PATCH 3.16 003/133] iio: magnetometer: st_magn_core: enable
 multiread by default for LIS3MDL

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Lorenzo Bianconi <lorenzo.bianconi83@...il.com>

commit 13718564167da80b6169809185b4c5a32497d0c1 upstream.

Enable multiread by default for LIS3MDL since using I2C interface
the subaddr Msb is used to automatically increase the slave address
during multiple data read/write. In the same way, using SPI interface,
bit 1 in register address is used to enable auto-increment of the slave
address in multiple read/write.

Fixes: 872e79add756 (iio:magn: Add STMicroelectronics magn driver)
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@...com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
[bwh: Backported to 3.16: Update the macro used to fill in this field]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iio/magnetometer/st_magn_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/magnetometer/st_magn_core.c
+++ b/drivers/iio/magnetometer/st_magn_core.c
@@ -112,7 +112,7 @@
 #define ST_MAGN_2_FS_AVL_8000_GAIN		292
 #define ST_MAGN_2_FS_AVL_12000_GAIN		438
 #define ST_MAGN_2_FS_AVL_16000_GAIN		584
-#define ST_MAGN_2_MULTIREAD_BIT			false
+#define ST_MAGN_2_MULTIREAD_BIT			true
 #define ST_MAGN_2_OUT_X_L_ADDR			0x28
 #define ST_MAGN_2_OUT_Y_L_ADDR			0x2a
 #define ST_MAGN_2_OUT_Z_L_ADDR			0x2c