spi: dw-mmio: convert to unified device property API

Convert the driver to use unfied device property API instead of OF one.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-dw-mmio.c

@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/of_platform.h>
+#include <linux/property.h>
 
 #include "spi-dw.h"
 
@@ -74,13 +75,11 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
 
 	dws->max_freq = clk_get_rate(dwsmmio->clk);
 
-	of_property_read_u32(pdev->dev.of_node, "reg-io-width",
-			     &dws->reg_io_width);
+	device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width);
 
 	num_cs = 4;
 
-	if (pdev->dev.of_node)
-		of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+	device_property_read_u32(&pdev->dev, "num-cs", &num_cs);
 
 	dws->num_cs = num_cs;