HAL_Linux: separate out the GPIO table for Disco

libraries/AP_HAL_Linux/GPIO.h

@@ -25,6 +25,8 @@ private:
 #include "GPIO_RPI.h"
 #elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_MINLURE
 #include "GPIO_Minnow.h"
-#elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BEBOP || CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
+#elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BEBOP
 #include "GPIO_Bebop.h"
+#elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
+#include "GPIO_Disco.h"
 #endif

libraries/AP_HAL_Linux/GPIO_Bebop.cpp

@@ -2,7 +2,7 @@
 
 #include "GPIO_Bebop.h"
 
-#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BEBOP || CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
+#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BEBOP
 
 const unsigned Linux::GPIO_Sysfs::pin_table[] = {
     [BEBOP_GPIO_CAMV_NRST] = 129,

libraries/AP_HAL_Linux/GPIO_Disco.cpp

@@ -0,0 +1,16 @@
+#include <AP_Common/AP_Common.h>
+
+#include "GPIO_Disco.h"
+
+#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
+
+const unsigned Linux::GPIO_Sysfs::pin_table[] = {
+    [DISCO_GPIO_MPU6050_DRDY] = 91,
+};
+
+const uint8_t Linux::GPIO_Sysfs::n_pins = _DISCO_GPIO_MAX;
+
+static_assert(ARRAY_SIZE(Linux::GPIO_Sysfs::pin_table) == _DISCO_GPIO_MAX,
+              "GPIO pin_table must have the same size of entries in enum gpio_disco");
+
+#endif

libraries/AP_HAL_Linux/GPIO_Disco.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "GPIO_Sysfs.h"
+
+enum gpio_disco {
+    DISCO_GPIO_MPU6050_DRDY,
+    _DISCO_GPIO_MAX,
+};