gru: kevin: define GPIOs used on both platforms

The same GPIOs are used on both platforms, definitions are added an a
new .h to make it easier to re-use them across the code.

BRANCH=none
BUG=chrome-os-partner:51537
TEST=panel backlight still enabled on Gru as before. The rest of the
     GPIOs are used in the upcoming patches.

Change-Id: I1a6c5b5beb82ffcc5fea397e8e9ec2f183f4a7e0
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/346219
Tested-by: Shunqian Zheng <zhengsq@rock-chips.com>

src/mainboard/google/gru/board.h

@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __COREBOOT_SRC_MAINBOARD_GOOGLE_GRU_BOARD_H
+#define __COREBOOT_SRC_MAINBOARD_GOOGLE_GRU_BOARD_H
+
+#include <gpio.h>
+
+#define GPIO_BACKLIGHT	GPIO(1, C, 1)
+#define GPIO_EC_IN_RW	GPIO(3, B, 0)
+#define GPIO_EC_IRQ	GPIO(0, A, 1)
+#define GPIO_RESET	GPIO(0, B, 3)
+#define GPIO_WP		GPIO(1, C, 2)
+
+void setup_chromeos_gpios(void);
+
+#endif  /* ! __COREBOOT_SRC_MAINBOARD_GOOGLE_GRU_BOARD_H */

src/mainboard/google/gru/mainboard.c

@@ -25,6 +25,8 @@
 #include <soc/grf.h>
 #include <soc/i2c.h>
 
+#include "board.h"
+
 static void configure_emmc(void)
 {
 	/* Host controller does not support programmable clock generator.
@@ -144,7 +146,7 @@ static void enable_backlight_booster(void)
 
 void mainboard_power_on_backlight(void)
 {
-	gpio_output(GPIO(1, C, 1), 1);  /* BL_EN */
+	gpio_output(GPIO_BACKLIGHT, 1);  /* BL_EN */
 
 	if (IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU))
 		enable_backlight_booster();