exynos5-dt-types: add board detection for Odroid XU3/XU3L/XU4.

This commit adds additional file with implementation of board
detection code for Odroid-XU3/XU4.

The detection depends on compatible found in fdt:
- "samsung,exynos5" - uses Exynos5 generic code
- "samsung,odroidxu3" - try detect XU3 revision

There are few revisions of Odroid XU3/XU4, each can be detected
by checking the value of channel 9 of built-in ADC:
 Rev   ADC  Board
 0.1     0  XU3 0.1
 0.2   372  XU3 0.2 | XU3L - no DISPLAYPORT
 0.3  1280  XU4 0.1

The detection code depends on the ADC+10% value.

Implementation of functions:
- set_board_type()     - read ADC and set type
- get_board_rev()      - returns board revision: 1..3
- get_board_type()     - returns board type string

Additional functions with return values of bool:
- board_is_generic()   - true if found compatible "samsung,exynos5"
                         but not "samsung,odroidxu3"
- board_is_odroidxu3() - true if found compatible "samsung,odroidxu3"
                         and one of XU3 revision.
- board_is_odroidxu4() - true if found compatible "samsung,odroidxu3"
                         and XU4 revision.

After I2C controller init, the get_board_type() can check
if the XU3 board is a "Lite" variant, by probing chip
0x40 on I2C0 (INA231 - exists only on non-lite).
This is useful for setting fdt file name at misc_init_r().

Enabled configs:
- CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
- CONFIG_ODROID_REV_AIN
- CONFIG_REVISION_TAG
- CONFIG_BOARD_TYPES

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/include/configs/odroid_xu3.h b/include/configs/odroid_xu3.h
index 3c70158..648e48b 100644
--- a/include/configs/odroid_xu3.h
+++ b/include/configs/odroid_xu3.h
@@ -94,6 +94,8 @@
 	"boot.scr fat 0 1;"                 \
 	"boot.cmd fat 0 1;"                 \
 	"exynos5422-odroidxu3.dtb fat 0 1;" \
+	"exynos5422-odroidxu3-lite.dtb fat 0 1;" \
+	"exynos5422-odroidxu4.dtb fat 0 1;" \
 	"boot part 0 1;"                    \
 	"root part 0 2\0"
 
@@ -113,9 +115,19 @@
 
 /* Enable: board/samsung/common/misc.c to use set_dfu_alt_info() */
 #define CONFIG_MISC_COMMON
+#define CONFIG_MISC_INIT_R
 #define CONFIG_SET_DFU_ALT_INFO
 #define CONFIG_SET_DFU_ALT_BUF_LEN	(SZ_1K)
 
+/* Set soc_rev, soc_id, board_rev, boardname, fdtfile */
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+#define CONFIG_ODROID_REV_AIN			9
+#define CONFIG_REVISION_TAG
+#define CONFIG_BOARD_TYPES
+
+#undef CONFIG_SYS_BOARD
+#define CONFIG_SYS_BOARD	"odroid"
+
 /* Define new extra env settings, including DFU settings */
 #undef CONFIG_EXTRA_ENV_SETTINGS
 #define CONFIG_EXTRA_ENV_SETTINGS \
diff --git a/include/samsung/exynos5-dt-types.h b/include/samsung/exynos5-dt-types.h
new file mode 100644
index 0000000..479e2e7
--- /dev/null
+++ b/include/samsung/exynos5-dt-types.h
@@ -0,0 +1,27 @@
+#ifndef _EXYNOS5_DT_H_
+#define _EXYNOS5_DT_H_
+
+enum {
+	EXYNOS5_BOARD_GENERIC,
+
+	EXYNOS5_BOARD_ODROID_XU3,
+	EXYNOS5_BOARD_ODROID_XU3_REV01,
+	EXYNOS5_BOARD_ODROID_XU3_REV02,
+	EXYNOS5_BOARD_ODROID_XU4_REV01,
+	EXYNOS5_BOARD_ODROID_UNKNOWN,
+
+	EXYNOS5_BOARD_COUNT,
+};
+
+struct odroid_rev_info {
+	int board_type;
+	int board_rev;
+	int adc_val;
+	const char *name;
+};
+
+bool board_is_generic(void);
+bool board_is_odroidxu3(void);
+bool board_is_odroidxu4(void);
+
+#endif