can: sja1000: fix handling on dt properties on little endian systems

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@vger.kernel.org>
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
index 6433b81..8e0c4a0 100644 (file)
--- 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;