linux-kernel - [PATCH 3/4] w1: mxc_w1: Perform a software reset at startup

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Date:	Thu,  8 May 2014 11:56:39 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	linux-kernel@...r.kernel.org
Cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	Alexander Shiyan <shc_work@...l.ru>
Subject: [PATCH 3/4] 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@...l.ru>
---
 drivers/w1/masters/mxc_w1.c | 5 +++++
 1 file changed, 5 insertions(+)

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 @@ 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;
-- 
1.8.3.2

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