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 0d05abe34362dd9f706d46bda4ffe313b515d0e4..741d2bb400aec148373b064a3bf0547a550a4009 100644 (file)
--- 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;