From: Alexander Shiyan <shc_work@mail.ru>
To: linux-kernel@vger.kernel.org
Cc: Evgeniy Polyakov <zbr@ioremap.net>,
Sascha Hauer <kernel@pengutronix.de>,
Shawn Guo <shawn.guo@freescale.com>,
Alexander Shiyan <shc_work@mail.ru>
Subject: [PATCH 3/4] w1: mxc_w1: Perform a software reset at startup
Date: Thu, 8 May 2014 11:56:39 +0400 [thread overview]
Message-ID: <1399535800-19335-3-git-send-email-shc_work@mail.ru> (raw)
In-Reply-To: <1399535800-19335-1-git-send-email-shc_work@mail.ru>
This patch adds a software reset for 1-Wire module at driver startup.
Signed-off-by: Alexander Shiyan <shc_work@mail.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
next prev parent reply other threads:[~2014-05-08 7:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 7:56 [PATCH 1/4] w1: mxc_w1: Fix incorrect "presence" status Alexander Shiyan
2014-05-08 7:56 ` [PATCH 2/4] w1: mxc_w1: Optimize mxc_w1_ds2_reset_bus() Alexander Shiyan
2014-05-08 7:56 ` Alexander Shiyan [this message]
2014-05-08 7:56 ` [PATCH 4/4] w1: mxc_w1: Optimize mxc_w1_ds2_touch_bit() Alexander Shiyan
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