spi/pxa2xx: pass of_node to spi device and set a parent device

the of_node will auto-publish devices which are added to the device
tree.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

drivers/spi/pxa2xx_spi.c

@@ -1556,6 +1556,10 @@ static int __devinit pxa2xx_spi_probe(struct platform_device *pdev)
 	drv_data->pdev = pdev;
 	drv_data->ssp = ssp;
 
+	master->dev.parent = &pdev->dev;
+#ifdef CONFIG_OF
+	master->dev.of_node = pdev->dev.of_node;
+#endif
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;