dm: Use dev_get_addr() where possible

This is a convenient way for a driver to get the hardware address of a
device, when regmap or syscon are not being used. Change existing callers
to use it as an example to others.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c
index 57b78e5..9d8f11e 100644
--- a/drivers/gpio/sunxi_gpio.c
+++ b/drivers/gpio/sunxi_gpio.c
@@ -285,8 +285,7 @@
 		no_banks = SUNXI_GPIO_BANKS;
 	}
 
-	ctlr = (struct sunxi_gpio_reg *)fdtdec_get_addr(gd->fdt_blob,
-						   parent->of_offset, "reg");
+	ctlr = (struct sunxi_gpio_reg *)dev_get_addr(parent);
 	for (bank = 0; bank < no_banks; bank++) {
 		struct sunxi_gpio_platdata *plat;
 		struct udevice *dev;