drivers/at86rf2xx: add support for high data rates

AT86RF2xx supports high data rates in O-QPSK mode.
This is a proprietary feature, so data rates > 0 are only supported by
other AT86RF2xx devices.

 high_rate 0:   250 kbit/s (IEEE mode)
 high_rate 1:   500 kbit/s
 high_rate 2:  1000 kbit/s (compatible with at86rf215)
 high_rate 3:  2000 kbit/s

drivers/Makefile.dep

@@ -93,6 +93,7 @@ endif
 ifneq (,$(filter at86rf%, $(filter-out at86rf215%, $(USEMODULE))))
   USEMODULE += at86rf2xx
   DEFAULT_MODULE += auto_init_at86rf2xx
+  DEFAULT_MODULE += netdev_ieee802154_oqpsk
 
   USEMODULE += xtimer
   USEMODULE += luid

drivers/at86rf2xx/at86rf2xx_getset.c

@@ -210,6 +210,48 @@ void at86rf2xx_set_page(at86rf2xx_t *dev, uint8_t page)
 #endif
 }
 
+uint8_t at86rf2xx_get_phy_mode(at86rf2xx_t *dev)
+{
+#ifdef MODULE_AT86RF212B
+    uint8_t ctrl2;
+    ctrl2 = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_CTRL_2);
+    if (ctrl2 & AT86RF2XX_TRX_CTRL_2_MASK__BPSK_OQPSK) {
+        return IEEE802154_PHY_OQPSK;
+    } else {
+        return IEEE802154_PHY_BPSK;
+    }
+#else
+    (void) dev;
+    return IEEE802154_PHY_OQPSK;
+#endif
+}
+
+int at86rf2xx_set_rate(at86rf2xx_t *dev, uint8_t rate)
+{
+    uint8_t ctrl2;
+
+    if (rate > 3) {
+        return -ERANGE;
+    }
+
+    ctrl2 = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_CTRL_2);
+    ctrl2 &= ~AT86RF2XX_TRX_CTRL_2_MASK__OQPSK_DATA_RATE;
+    ctrl2 |= rate;
+    at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_CTRL_2, ctrl2);
+
+    return 0;
+}
+
+uint8_t at86rf2xx_get_rate(at86rf2xx_t *dev)
+{
+    uint8_t rate;
+
+    rate = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_CTRL_2);
+    rate &= AT86RF2XX_TRX_CTRL_2_MASK__OQPSK_DATA_RATE;
+
+    return rate;
+}
+
 uint16_t at86rf2xx_get_pan(const at86rf2xx_t *dev)
 {
     return dev->netdev.pan;

drivers/at86rf2xx/at86rf2xx_netdev.c

@@ -451,6 +451,20 @@ static int _get(netdev_t *netdev, netopt_t opt, void *val, size_t max_len)
             }
             break;
 
+#ifdef MODULE_NETDEV_IEEE802154_OQPSK
+
+        case NETOPT_IEEE802154_PHY:
+            assert(max_len >= sizeof(int8_t));
+            *(uint8_t *)val = at86rf2xx_get_phy_mode(dev);
+            return sizeof(uint8_t);
+
+        case NETOPT_OQPSK_RATE:
+            assert(max_len >= sizeof(int8_t));
+            *(uint8_t *)val = at86rf2xx_get_rate(dev);
+            return sizeof(uint8_t);
+
+#endif /* MODULE_NETDEV_IEEE802154_OQPSK */
+
         default:
             res = -ENOTSUP;
             break;
@@ -638,6 +652,19 @@ static int _set(netdev_t *netdev, netopt_t opt, const void *val, size_t len)
             res = sizeof(int8_t);
             break;
 
+#ifdef MODULE_NETDEV_IEEE802154_OQPSK
+
+        case NETOPT_OQPSK_RATE:
+            assert(len <= sizeof(int8_t));
+            if (at86rf2xx_set_rate(dev, *((const uint8_t *)val)) < 0) {
+                res = -EINVAL;
+            } else {
+                res = sizeof(uint8_t);
+            }
+            break;
+
+#endif /* MODULE_NETDEV_IEEE802154_OQPSK */
+
         default:
             break;
     }

drivers/include/at86rf2xx.h

@@ -374,6 +374,39 @@ uint8_t at86rf2xx_get_page(const at86rf2xx_t *dev);
  */
 void at86rf2xx_set_page(at86rf2xx_t *dev, uint8_t page);
 
+/**
+ * @brief   Get the PHY mode of the given device
+ *
+ * @param[in,out] dev       device to read from
+ * @return                  the currently set phy mode
+ */
+uint8_t at86rf2xx_get_phy_mode(at86rf2xx_t *dev);
+
+/**
+ * @brief   Get the current O-QPSK rate mode of the PHY
+ *
+ * @param[in] dev           device to read from
+ *
+ * @return                  the currenty set rate mode
+ */
+uint8_t at86rf2xx_get_rate(at86rf2xx_t *dev);
+
+/**
+ * @brief   Set the current O-QPSK rate mode of the PHY
+ *          rate modes > 0 are proprietary.
+ *
+ *          rate 0:   250 kbit/s (IEEE mode)
+ *          rate 1:   500 kbit/s
+ *          rate 2:  1000 kbit/s (compatible with AT86RF215)
+ *          rate 3:  2000 kbit/s
+ *
+ * @param[in] dev           device to write to
+ * @param[in] rate          the selected data rate mode (0-3)
+ *
+ * @return                  0 on success, otherwise error value
+ */
+int at86rf2xx_set_rate(at86rf2xx_t *dev, uint8_t rate);
+
 /**
  * @brief   Get the configured PAN ID of the given device
  *