spi: dw: Use generic function to read reg address

Using an fdt-specific function causes problems when compiled with a live
tree.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Tested-by Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 32de33f..e8ba80e 100644 (file)
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -160,6 +160,8 @@ static int dw_spi_ofdata_to_platdata(struct udevice *bus)
        struct dw_spi_platdata *plat = bus->platdata;
 
        plat->regs = dev_read_addr_ptr(bus);
+       if (!plat->regs)
+               return -EINVAL;
 
        /* Use 500KHz as a suitable default */
        plat->frequency = dev_read_u32_default(bus, "spi-max-frequency",