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authorAlexander Shiyan <shc_work@mail.ru>2014-05-08 11:56:39 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-19 17:43:34 -0700
commitb7ce0b5d03f303cba0fff3f9df17f400d4e7a2d8 (patch)
treeeb888153def72a66ffcb36d667bc11c8a99b300f
parentb0dceb6a96c2f87a40a9f99bc05711a3f7c1eaa2 (diff)
downloadlinux-b7ce0b5d03f303cba0fff3f9df17f400d4e7a2d8.tar.bz2
w1: mxc_w1: Perform a software reset at startup
This patch adds a software reset for 1-Wire module at driver startup. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/w1/masters/mxc_w1.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c
index 0d05abe34362..741d2bb400ae 100644
--- a/drivers/w1/masters/mxc_w1.c
+++ b/drivers/w1/masters/mxc_w1.c
@@ -32,6 +32,7 @@
# define MXC_W1_CONTROL_RPP BIT(7)
#define MXC_W1_TIME_DIVIDER 0x02
#define MXC_W1_RESET 0x04
+# define MXC_W1_RESET_RST BIT(0)
struct mxc_w1_device {
void __iomem *regs;
@@ -129,6 +130,10 @@ static int mxc_w1_probe(struct platform_device *pdev)
if (err)
return err;
+ /* Software reset 1-Wire module */
+ writeb(MXC_W1_RESET_RST, mdev->regs + MXC_W1_RESET);
+ writeb(0, mdev->regs + MXC_W1_RESET);
+
writeb(clkdiv - 1, mdev->regs + MXC_W1_TIME_DIVIDER);
mdev->bus_master.data = mdev;