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>
diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c
index 0d05abe..741d2bb4 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 @@
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;
