platform: add radxa zero3 support

Signed-off-by: Nascs <nascs@radxa.com>

Author: nascs

README.md

@@ -46,13 +46,14 @@ ARM
 * [96Boards](../master/docs/96boards.md)
 * [ADLINK IPi-SMARC ARM](../master/docs/adlink_ipi_arm.md)
 * [Radxa CM3](../master/docs/radxa_cm3.md)
+* [Radxa CM5 IO](../master/docs/radxa_cm5_io.md)
 * [Radxa E25](../master/docs/radxa_e25.md)
 * [Radxa ROCK 3A](../master/docs/radxa_rock_3a.md)
 * [Radxa ROCK 3B](../master/docs/radxa_rock_3b.md)
 * [Radxa ROCK 3C](../master/docs/radxa_rock_3c.md)
 * [Radxa ROCK 5A](../master/docs/radxa_rock_5a.md)
 * [Radxa ROCK 5B](../master/docs/radxa_rock_5b.md)
-* [Radxa CM5 IO](../master/docs/radxa_cm5_io.md)
+* [Radxa ZERO3](../master/docs/radxa_zero3.md)
 * [Rock Pi 4](../master/docs/rockpi4.md)
 * [Orange Pi Prime](../master/docs/orange_pi_prime.md)
 

docs/index.java.md

@@ -62,6 +62,7 @@ Specific platform information for supported platforms is documented here:
 - @ref radxa_rock_3c
 - @ref radxa_rock_5a
 - @ref radxa_rock_5b
+- @ref radxa_zero3
 - @ref rockpi4
 
 ## DEBUGGING

docs/index.md

@@ -70,6 +70,7 @@ Specific platform information for supported platforms is documented here:
 - @ref radxa_rock_3c
 - @ref radxa_rock_5a
 - @ref radxa_rock_5b
+- @ref radxa_zero3
 - @ref rockpi4
 
 ## DEBUGGING

docs/radxa_zero3.md

@@ -0,0 +1,20 @@
+Radxa ZERO 3 {#_Radxa}
+=====================
+
+Radxa ZERO 3 is an ultra-small, versatile platform that can be used for a wide variety of applications, including IoT devices, machine learning edge computing, home automation, education, and entertainment.
+
+The ZERO 3W and ZERO 3E differ only in storage and network interfaces. 
+
+Pin Mapping
+-----------
+
+The Radxa ZERO 3's GPIO pinout is compatible with the [Radxa ROCK 3C](./radxa_rock_3c.md).
+
+Supports
+--------
+
+You can find additional product support in the following channels:
+
+- [Product Info](https://docs.radxa.com/en/zero/zero3)
+- [Forums](https://forum.radxa.com/c/rock3)
+- [Github](https://github.com/radxa)

include/arm/radxa_rock_3c.h

@@ -21,6 +21,7 @@ extern "C" {
 #define MRAA_RADXA_ROCK_3C_AIO_COUNT  0
 #define MRAA_RADXA_ROCK_3C_PIN_COUNT  40
 #define PLATFORM_NAME_RADXA_ROCK_3C   "Radxa ROCK3 Model C"
+#define PLATFORM_NAME_RADXA_ZERO3     "Radxa ZERO 3"
 
 mraa_board_t *
         mraa_radxa_rock_3c();

src/arm/arm.c

@@ -110,7 +110,8 @@ mraa_arm_platform()
             platform_type = MRAA_RADXA_ROCK_3A;
         else if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ROCK_3B))
             platform_type = MRAA_RADXA_ROCK_3B;
-        else if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ROCK_3C))
+        else if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ROCK_3C) ||
+                 mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ZERO3))
             platform_type = MRAA_RADXA_ROCK_3C;
         else if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ROCK_5A))
             platform_type = MRAA_RADXA_ROCK_5A;

src/arm/radxa_rock_3c.c

@@ -49,11 +49,19 @@ mraa_radxa_rock_3c()
         return NULL;
     }
 
+    if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ROCK_3C)) {
+        b->platform_name = PLATFORM_NAME_RADXA_ROCK_3C;
+    } else if (mraa_file_contains("/proc/device-tree/model", PLATFORM_NAME_RADXA_ZERO3)) {
+        b->platform_name = PLATFORM_NAME_RADXA_ZERO3;
+    } else {
+        syslog(LOG_ERR, "An unknown product detected. Fail early...");
+        free(b);
+        return NULL;
+    }
+
     // pin mux for buses are setup by default by kernel so tell mraa to ignore them
     b->no_bus_mux = 1;
     b->phy_pin_count = MRAA_RADXA_ROCK_3C_PIN_COUNT + 1;
-
-    b->platform_name = PLATFORM_NAME_RADXA_ROCK_3C;
     b->chardev_capable = 1;
 
     // UART