netdev - [PATCH 2/2] can: sja1000: fix handling on dt properties on little endian systems

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Date:	Fri, 12 Apr 2013 13:11:57 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	netdev@...r.kernel.org
Cc:	linux-can@...r.kernel.org, davem@...emloft.net,
	Christoph Fritz <chf.fritz@...glemail.com>,
	linux-stable <stable@...r.kernel.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 2/2] can: sja1000: fix handling on dt properties on little endian systems

From: Christoph Fritz <chf.fritz@...glemail.com>

To get correct endianes on little endian cpus (like arm) while reading device
tree properties, this patch replaces of_get_property() with
of_property_read_u32(). While there use of_property_read_bool() for the
handling of the boolean "nxp,no-comparator-bypass" property.

Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Christoph Fritz <chf.fritz@...glemail.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/sja1000/sja1000_of_platform.c | 31 +++++++++++++--------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
index 6433b81..8e0c4a0 100644
--- a/drivers/net/can/sja1000/sja1000_of_platform.c
+++ b/drivers/net/can/sja1000/sja1000_of_platform.c
@@ -96,8 +96,8 @@ static int sja1000_ofp_probe(struct platform_device *ofdev)
 	struct net_device *dev;
 	struct sja1000_priv *priv;
 	struct resource res;
-	const u32 *prop;
-	int err, irq, res_size, prop_size;
+	u32 prop;
+	int err, irq, res_size;
 	void __iomem *base;
 
 	err = of_address_to_resource(np, 0, &res);
@@ -138,27 +138,27 @@ static int sja1000_ofp_probe(struct platform_device *ofdev)
 	priv->read_reg = sja1000_ofp_read_reg;
 	priv->write_reg = sja1000_ofp_write_reg;
 
-	prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size);
-	if (prop && (prop_size ==  sizeof(u32)))
-		priv->can.clock.freq = *prop / 2;
+	err = of_property_read_u32(np, "nxp,external-clock-frequency", &prop);
+	if (!err)
+		priv->can.clock.freq = prop / 2;
 	else
 		priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
 
-	prop = of_get_property(np, "nxp,tx-output-mode", &prop_size);
-	if (prop && (prop_size == sizeof(u32)))
-		priv->ocr |= *prop & OCR_MODE_MASK;
+	err = of_property_read_u32(np, "nxp,tx-output-mode", &prop);
+	if (!err)
+		priv->ocr |= prop & OCR_MODE_MASK;
 	else
 		priv->ocr |= OCR_MODE_NORMAL; /* default */
 
-	prop = of_get_property(np, "nxp,tx-output-config", &prop_size);
-	if (prop && (prop_size == sizeof(u32)))
-		priv->ocr |= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK;
+	err = of_property_read_u32(np, "nxp,tx-output-config", &prop);
+	if (!err)
+		priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
 	else
 		priv->ocr |= OCR_TX0_PULLDOWN; /* default */
 
-	prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size);
-	if (prop && (prop_size == sizeof(u32)) && *prop) {
-		u32 divider = priv->can.clock.freq * 2 / *prop;
+	err = of_property_read_u32(np, "nxp,clock-out-frequency", &prop);
+	if (!err && prop) {
+		u32 divider = priv->can.clock.freq * 2 / prop;
 
 		if (divider > 1)
 			priv->cdr |= divider / 2 - 1;
@@ -168,8 +168,7 @@ static int sja1000_ofp_probe(struct platform_device *ofdev)
 		priv->cdr |= CDR_CLK_OFF; /* default */
 	}
 
-	prop = of_get_property(np, "nxp,no-comparator-bypass", NULL);
-	if (!prop)
+	if (!of_property_read_bool(np, "nxp,no-comparator-bypass"))
 		priv->cdr |= CDR_CBP; /* default */
 
 	priv->irq_flags = IRQF_SHARED;
-- 
1.8.2.rc2

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