AM3517: Enable RTC driver support for AM3517EVM

Add platform hook-up interface to support RTC driver (S35390A).
Signed-off-by: NVaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-am3517evm.c

@@ -38,6 +38,39 @@
 #define LCD_PANEL_BKLIGHT_PWR	182
 #define LCD_PANEL_PWM		181
 
+static struct i2c_board_info __initdata am3517evm_i2c_boardinfo[] = {
+	{
+		I2C_BOARD_INFO("s35390a", 0x30),
+		.type		= "s35390a",
+	},
+};
+
+/*
+ * RTC - S35390A
+ */
+#define GPIO_RTCS35390A_IRQ	55
+
+static void __init am3517_evm_rtc_init(void)
+{
+	int r;
+
+	omap_mux_init_gpio(GPIO_RTCS35390A_IRQ, OMAP_PIN_INPUT_PULLUP);
+	r = gpio_request(GPIO_RTCS35390A_IRQ, "rtcs35390a-irq");
+	if (r < 0) {
+		printk(KERN_WARNING "failed to request GPIO#%d\n",
+				GPIO_RTCS35390A_IRQ);
+		return;
+	}
+	r = gpio_direction_input(GPIO_RTCS35390A_IRQ);
+	if (r < 0) {
+		printk(KERN_WARNING "GPIO#%d cannot be configured as input\n",
+				GPIO_RTCS35390A_IRQ);
+		gpio_free(GPIO_RTCS35390A_IRQ);
+		return;
+	}
+	am3517evm_i2c_boardinfo[0].irq = gpio_to_irq(GPIO_RTCS35390A_IRQ);
+}
+
 static int __init am3517_evm_i2c_init(void)
 {
 	omap_register_i2c_bus(1, 400, NULL, 0);
@@ -235,6 +268,12 @@ static void __init am3517_evm_init(void)
 	usb_ehci_init(&ehci_pdata);
 	/* DSS */
 	am3517_evm_display_init();
+
+	/* RTC - S35390A */
+	am3517_evm_rtc_init();
+
+	i2c_register_board_info(1, am3517evm_i2c_boardinfo,
+				ARRAY_SIZE(am3517evm_i2c_boardinfo));
 }
 
 static void __init am3517_evm_map_io(void)