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w1: mxc_w1: Perform a software reset at startup

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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>
This commit is contained in:
Alexander Shiyan
2014-05-08 11:56:39 +04:00
committed by Greg Kroah-Hartman
parent b0dceb6a96
commit b7ce0b5d03
1 changed files with 5 additions and 0 deletions
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5
drivers/w1/masters/mxc_w1.c
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@@ -32,6 +32,7 @@
# define MXC_W1_CONTROL_RPP BIT(7) # define MXC_W1_CONTROL_RPP BIT(7)
#define MXC_W1_TIME_DIVIDER 0x02 #define MXC_W1_TIME_DIVIDER 0x02
#define MXC_W1_RESET 0x04 #define MXC_W1_RESET 0x04
# define MXC_W1_RESET_RST BIT(0)
struct mxc_w1_device { struct mxc_w1_device {
void __iomem *regs; void __iomem *regs;
@@ -129,6 +130,10 @@ static int mxc_w1_probe(struct platform_device *pdev)
if (err) if (err)
return 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); writeb(clkdiv - 1, mdev->regs + MXC_W1_TIME_DIVIDER);
mdev->bus_master.data = mdev; mdev->bus_master.data = mdev;