gpio: Build the da8xx_gpio code for the davinci644x device

The differences include the number of GPIOs and that one is
not required to set the pinmux on request.

Signed-off-by: Holger Hans Peter Freyther <holger@freyther.de>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 2d97b4f..9df1e26 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -39,6 +39,7 @@
 COBJS-$(CONFIG_SPEAR_GPIO)	+= spear_gpio.o
 COBJS-$(CONFIG_TEGRA_GPIO)	+= tegra_gpio.o
 COBJS-$(CONFIG_DA8XX_GPIO)	+= da8xx_gpio.o
+COBJS-$(CONFIG_DM644X_GPIO)	+= da8xx_gpio.o
 COBJS-$(CONFIG_ALTERA_PIO)	+= altera_pio.o
 COBJS-$(CONFIG_MPC83XX_GPIO)	+= mpc83xx_gpio.o
 COBJS-$(CONFIG_SH_GPIO_PFC)	+= sh_pfc.o
diff --git a/drivers/gpio/da8xx_gpio.c b/drivers/gpio/da8xx_gpio.c
index 84d2b77..ed6a118 100644
--- a/drivers/gpio/da8xx_gpio.c
+++ b/drivers/gpio/da8xx_gpio.c
@@ -31,6 +31,7 @@
 	char name[GPIO_NAME_SIZE];
 } gpio_registry[MAX_NUM_GPIOS];
 
+#if defined(CONFIG_SOC_DA8XX)
 #define pinmux(x)       (&davinci_syscfg_regs->pinmux[x])
 
 static const struct pinmux_config gpio_pinmux[] = {
@@ -179,6 +180,9 @@
 	{ pinmux(18), 8, 3 },
 	{ pinmux(18), 8, 2 },
 };
+#else
+#define davinci_configure_pin_mux(a, b)
+#endif
 
 int gpio_request(unsigned gpio, const char *label)
 {