netdev - [PATCH v3 5/8] net: can: c_can: Add support for START pulse in RAMINIT sequence

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Message-ID: <1415096461-25576-6-git-send-email-rogerq@ti.com>
Date:	Tue, 4 Nov 2014 12:20:58 +0200
From:	Roger Quadros <rogerq@...com>
To:	<wg@...ndegger.com>, <mkl@...gutronix.de>
CC:	<wsa@...-dreams.de>, <tony@...mide.com>, <tglx@...utronix.de>,
	<mugunthanvnm@...com>, <george.cherian@...com>, <balbi@...com>,
	<nsekhar@...com>, <nm@...com>,
	<sergei.shtylyov@...entembedded.com>, <linux-omap@...r.kernel.org>,
	<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
	Roger Quadros <rogerq@...com>
Subject: [PATCH v3 5/8] net: can: c_can: Add support for START pulse in RAMINIT sequence

Some SoCs e.g. (TI DRA7xx) need a START pulse to start the
RAMINIT sequence i.e. START bit must be set and cleared before
checking for the DONE bit status.

Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/net/can/c_can/c_can_platform.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index d0ce439..ef1f5ce 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -124,6 +124,12 @@ static void c_can_hw_raminit_syscon(const struct c_can_priv *priv, bool enable)
 		ctrl |= 1 << start_bit;
 		regmap_write(raminit->syscon, raminit->reg, ctrl);
 
+		/* clear START bit if start pulse is needed */
+		if (priv->drvdata->raminit_pulse) {
+			ctrl &= ~(1 << start_bit);
+			regmap_write(raminit->syscon, raminit->reg, ctrl);
+		}
+
 		ctrl |= 1 << done_bit;
 		c_can_hw_raminit_wait_syscon(priv, mask, ctrl);
 	}
-- 
1.8.3.2

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