ARM: Samsung: Add Exynos5422-based Odroid HC1 support

Odroid HC1 board is based on Odroid XU4 board, but it has no HDMI,
no eMMC, no build-in USB3.0 hub, no extension port pins, and no GPIO
button. USB3.0 ports are used for build-in JMicron USB to SATA bridge
and Gigabit R8152 ethernet chips. HC1 uses only passive cooling.

This patch also updates Odroid's ADCmax array and reduces ADC tolerance
to 1% to ensure that XU4 and HC1 revisions are properly detected.

I've tested this with XU3, XU3-lite, XU4 and HC1 boards. In case of my test
boards I got following values from ADC register: 372, 370, 1281 and 1313.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

2 files changed, 22 insertions, 9 deletions

diff --git a/board/samsung/common/exynos5-dt-types.c b/board/samsung/common/exynos5-dt-types.c
index 48fd1f7d966..03d3a3112a1 100644
--- a/board/samsung/common/exynos5-dt-types.c
+++ b/board/samsung/common/exynos5-dt-types.c
@@ -25,17 +25,22 @@ static const struct udevice_id board_ids[] = {
 };
 
 /**
- * Odroix XU3/4 board revisions:
+ * Odroix XU3/XU4/HC1 board revisions (from HC1_MAIN_REV0.1_20170630.pdf):
  * Rev   ADCmax  Board
  * 0.1     0     XU3 0.1
- * 0.2   410     XU3 0.2 | XU3L - no DISPLAYPORT (probe I2C0:0x40 / INA231)
- * 0.3  1408     XU4 0.1
- * Use +10 % for ADC value tolerance.
+ * 0.2   372     XU3 0.2 | XU3L - no DISPLAYPORT (probe I2C0:0x40 / INA231)
+ * 0.3  1280     XU4 0.1
+ * 0.4   739     XU4 0.2
+ * 0.5  1016     XU4+Air0.1 (Passive cooling)
+ * 0.6  1308     XU4S 0.1 (HC1)
+ * Use +1% for ADC value tolerance in the array below, the code loops until
+ * the measured ADC value is lower than then ADCmax from the array.
  */
 struct odroid_rev_info odroid_info[] = {
 	{ EXYNOS5_BOARD_ODROID_XU3_REV01, 1, 10, "xu3" },
-	{ EXYNOS5_BOARD_ODROID_XU3_REV02, 2, 410, "xu3" },
-	{ EXYNOS5_BOARD_ODROID_XU4_REV01, 1, 1408, "xu4" },
+	{ EXYNOS5_BOARD_ODROID_XU3_REV02, 2, 375, "xu3" },
+	{ EXYNOS5_BOARD_ODROID_XU4_REV01, 1, 1293, "xu4" },
+	{ EXYNOS5_BOARD_ODROID_HC1_REV01, 1, 1321, "hc1" },
 	{ EXYNOS5_BOARD_ODROID_UNKNOWN, 0, 4095, "unknown" },
 };
 
@@ -61,7 +66,7 @@ static int odroid_get_board_type(void)
 		goto rev_default;
 
 	for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
-		/* ADC tolerance: +20 % */
+		/* ADC tolerance: +1% */
 		if (adcval < odroid_info[i].adc_val)
 			return odroid_info[i].board_type;
 	}
@@ -132,6 +137,14 @@ bool board_is_odroidxu4(void)
 	return false;
 }
 
+bool board_is_odroidhc1(void)
+{
+	if (gd->board_type == EXYNOS5_BOARD_ODROID_HC1_REV01)
+		return true;
+
+	return false;
+}
+
 bool board_is_generic(void)
 {
 	if (gd->board_type == EXYNOS5_BOARD_GENERIC)
diff --git a/board/samsung/common/exynos5-dt.c b/board/samsung/common/exynos5-dt.c
index 0d17f30712c..a4eb3514051 100644
--- a/board/samsung/common/exynos5-dt.c
+++ b/board/samsung/common/exynos5-dt.c
@@ -176,7 +176,7 @@ char *get_dfu_alt_system(char *interface, char *devstr)
 {
 	char *info = "Not supported!";
 
-	if (board_is_odroidxu4())
+	if (board_is_odroidxu4() || board_is_odroidhc1())
 		return info;
 
 	return env_get("dfu_alt_system");
@@ -189,7 +189,7 @@ char *get_dfu_alt_boot(char *interface, char *devstr)
 	char *alt_boot;
 	int dev_num;
 
-	if (board_is_odroidxu4())
+	if (board_is_odroidxu4() || board_is_odroidhc1())
 		return info;
 
 	dev_num = simple_strtoul(devstr, NULL, 10);