Added Qualcomm DragonBoard 820c support.

GPIO ports from DragonBoard 820c Hardware Manual (p16) at
https://github.com/sdrobertw/dragonboard820c/blob/master/hardware-docs/files/db820c-user-guide.docx

Add Chardev support for DragonBoard 820c

Signed-off-by: Ivan Farkas <Ivan.Farkas@TeleCuris.com>
Signed-off-by: malikabhi05 <abhishek.malik@intel.com>

docs/96boards.md

@@ -9,6 +9,7 @@ Board Support
 -------------
 
 - [DragonBoard 410c](http://www.96boards.org/product/dragonboard410c/)
+- [DragonBoard 820c](http://www.96boards.org/product/dragonboard820c/)
 - [HiKey](http://www.96boards.org/product/hikey/)
 - [Bubblegum-96](http://www.96boards.org/product/bubblegum-96/)
 

src/arm/96boards.c

@@ -60,10 +60,12 @@ int db820c_ls_gpio_pins[MRAA_96BOARDS_LS_GPIO_COUNT] = {
 };
 
 int db820c_chardev_map[MRAA_96BOARDS_LS_GPIO_COUNT][2] = {
-    { 0, 80 }, { 0, 29 }, { 0, 124 }, { 0, 62 }, { 0, 507 }, { 2, 3 },
+    { 0, 80 }, { 0, 29 }, { 0, 124 }, { 0, 24 }, { 0, 62 }, { 2, 3 },
     { 0, 10 }, { 0, 8 }, { 0, 25 }, { 0, 26 }, { 0, 23 },  { 0, 133 },
 };
 
+const char* db820c_serialdev[MRAA_96BOARDS_LS_UART_COUNT] = { "/dev/ttyMSM0", "/dev/ttyMSM1" };
+
 int hikey_ls_gpio_pins[MRAA_96BOARDS_LS_GPIO_COUNT] = {
     488, 489, 490, 491, 492, 415, 463, 495, 426, 433, 427, 434,
 };
@@ -73,11 +75,6 @@ int hikey_chardev_map[MRAA_96BOARDS_LS_GPIO_COUNT][2] = {
     { 6, 7 }, { 2, 7 }, { 10, 2 }, { 9, 1 }, { 10, 3 }, { 9, 2 },
 };
 
-int hikey_chardev_map[MRAA_96BOARDS_LS_GPIO_COUNT][2] = {
-    { 2, 0 }, { 2, 1 }, { 2, 2 },  { 2, 3 }, { 2, 4 },  { 12, 7 },
-    { 6, 7 }, { 2, 7 }, { 10, 2 }, { 9, 1 }, { 10, 3 }, { 9, 2 },
-};
-
 const char* hikey_serialdev[MRAA_96BOARDS_LS_UART_COUNT] = { "/dev/ttyAMA2", "/dev/ttyAMA3" };
 
 int bbgum_ls_gpio_pins[MRAA_96BOARDS_LS_GPIO_COUNT] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 155, 154 };
@@ -228,7 +225,7 @@ mraa_96boards()
     b->no_bus_mux = 1;
     b->phy_pin_count = MRAA_96BOARDS_LS_PIN_COUNT + 1;
 
-	if (mraa_file_exist(DT_BASE "/model")) {
+    if (mraa_file_exist(DT_BASE "/model")) {
         // We are on a modern kernel, great!!!!
         if (mraa_file_contains(DT_BASE "/model", "Qualcomm Technologies, Inc. APQ 8016 SBC")) {
             b->platform_name = PLATFORM_NAME_DB410C;
@@ -257,7 +254,6 @@ mraa_96boards()
         }
     }
 
-
     // UART
     b->uart_dev_count = MRAA_96BOARDS_LS_UART_COUNT;
     b->def_uart_dev = 0;

src/arm/arm.c

@@ -87,6 +87,8 @@ mraa_arm_platform()
     if (platform_type == MRAA_UNKNOWN_PLATFORM) {
         if (mraa_file_contains("/proc/device-tree/compatible", "qcom,apq8016-sbc"))
             platform_type = MRAA_96BOARDS;
+        else if (mraa_file_contains("/proc/device-tree/compatible", "arrow,apq8096-db820c"))
+            platform_type = MRAA_96BOARDS;
         else if (mraa_file_contains("/proc/device-tree/model",
                                     "HiKey Development Board"))
             platform_type = MRAA_96BOARDS;