rh: add lo distribution support

- This is a combination of 5 commits.
- rh: add lo distribution board gpio expander
- rh: add lo distribution mpm functions
- rh: add code to conditionally initialize lo distribution
- rh: change empty i2c device from exception to assertion
- rh: add lo distribution board control

1 files changed, 32 insertions, 0 deletions

diff --git a/host/lib/usrp/dboard/rhodium/rhodium_radio_ctrl_impl.hpp b/host/lib/usrp/dboard/rhodium/rhodium_radio_ctrl_impl.hpp
index 4f4dd925c..c070dabea 100644
--- a/host/lib/usrp/dboard/rhodium/rhodium_radio_ctrl_impl.hpp
+++ b/host/lib/usrp/dboard/rhodium/rhodium_radio_ctrl_impl.hpp
@@ -114,6 +114,12 @@ public:
     bool get_tx_lo_export_enabled(const std::string& name, const size_t chan);
     bool get_rx_lo_export_enabled(const std::string& name, const size_t chan);
 
+    // LO Distribution Control
+    void set_tx_lo_output_enabled(const bool enabled, const std::string& port_name, const size_t chan);
+    void set_rx_lo_output_enabled(const bool enabled, const std::string& port_name, const size_t chan);
+    bool get_tx_lo_output_enabled(const std::string& port_name, const size_t chan);
+    bool get_rx_lo_output_enabled(const std::string& port_name, const size_t chan);
+
     // LO Gain Control
 
     //! Set the external gain for a TX LO
@@ -185,6 +191,25 @@ private:
         const direction_t dir
     );
 
+    //! Validate that port_name is valid, and that LO distribution functions
+    //  can be called in this instance
+    void _validate_output_port(
+        const std::string& port_name,
+        const std::string& function_name
+    );
+
+    //! Configure LO Distribution board's termination switches
+    void _set_lo_output_enabled(
+        const bool enabled,
+        const std::string& port_name,
+        const direction_t dir
+    );
+
+    bool _get_lo_output_enabled(
+        const std::string& port_name,
+        const direction_t dir
+    );
+
     //! Configure LO1's output power
     //  Out of range values will be coerced to [0-63]
     double _set_lo1_power(
@@ -336,6 +361,13 @@ private:
     double _rx_lo_freq = 0.0;
     double _tx_lo_freq = 0.0;
 
+    //! LO Distribution board
+    bool _lo_dist_present = false;
+
+    //! LO Distribution board output status
+    bool _lo_dist_rx_out_enabled[4] = { false, false, false, false };
+    bool _lo_dist_tx_out_enabled[4] = { false, false, false, false };
+
 }; /* class radio_ctrl_impl */
 
 }} /* namespace uhd::rfnoc */