lss: Remove redundant tristate control outputs on I2C modules

Signed-off-by: Alex Forencich <alex@alexforencich.com>

rtl/lss/taxi_i2c_master.sv

@@ -31,10 +31,8 @@ module taxi_i2c_master (
      */
     input  wire logic         scl_i,
     output wire logic         scl_o,
-    output wire logic         scl_t,
     input  wire logic         sda_i,
     output wire logic         sda_o,
-    output wire logic         sda_t,
 
     /*
      * Status
@@ -124,22 +122,13 @@ stop_on_idle
     automatically issue stop when command input is not valid
 
 Example of interfacing with tristate pins:
-(this will work for any tristate bus)
-
-assign scl_i = scl_pin;
-assign scl_pin = scl_t ? 1'bz : scl_o;
-assign sda_i = sda_pin;
-assign sda_pin = sda_t ? 1'bz : sda_o;
-
-Equivalent code that does not use *_t connections:
-(we can get away with this because I2C is open-drain)
 
 assign scl_i = scl_pin;
 assign scl_pin = scl_o ? 1'bz : 1'b0;
 assign sda_i = sda_pin;
 assign sda_pin = sda_o ? 1'bz : 1'b0;
 
-Example of two interconnected I2C devices:
+Example of two interconnected internal I2C devices:
 
 assign scl_1_i = scl_1_o & scl_2_o;
 assign scl_2_i = scl_1_o & scl_2_o;
@@ -265,9 +254,7 @@ assign m_axis_data.tdest = '0;
 assign m_axis_data.tuser = '0;
 
 assign scl_o = scl_o_reg;
-assign scl_t = scl_o_reg;
 assign sda_o = sda_o_reg;
-assign sda_t = sda_o_reg;
 
 assign busy = busy_reg;
 assign bus_active = bus_active_reg;

rtl/lss/taxi_i2c_single_reg.sv

@@ -28,10 +28,8 @@ module taxi_i2c_single_reg #(
      */
     input  wire logic        scl_i,
     output wire logic        scl_o,
-    output wire logic        scl_t,
     input  wire logic        sda_i,
     output wire logic        sda_o,
-    output wire logic        sda_t,
 
     /*
      * Data register
@@ -72,9 +70,7 @@ logic last_scl_i_reg = 1'b1;
 logic last_sda_i_reg = 1'b1;
 
 assign scl_o = 1'b1;
-assign scl_t = 1'b1;
 assign sda_o = sda_o_reg;
-assign sda_t = sda_o_reg;
 
 assign data_out = data_reg;
 

tb/lss/taxi_i2c_master/test_taxi_i2c_master.sv

@@ -27,10 +27,8 @@ taxi_axis_if #(.DATA_W(8)) m_axis_data();
 
 logic scl_i;
 logic scl_o;
-logic scl_t;
 logic sda_i;
 logic sda_o;
-logic sda_t;
 
 logic busy;
 logic bus_control;
@@ -57,10 +55,8 @@ uut (
      */
     .scl_i(scl_i),
     .scl_o(scl_o),
-    .scl_t(scl_t),
     .sda_i(sda_i),
     .sda_o(sda_o),
-    .sda_t(sda_t),
 
     /*
      * Status

tb/lss/taxi_i2c_single_reg/test_taxi_i2c_single_reg.sv

@@ -29,10 +29,8 @@ logic rst;
 
 logic scl_i;
 logic scl_o;
-logic scl_t;
 logic sda_i;
 logic sda_o;
-logic sda_t;
 
 logic [7:0] data_in;
 logic data_latch;
@@ -51,10 +49,8 @@ uut (
      */
     .scl_i(scl_i),
     .scl_o(scl_o),
-    .scl_t(scl_t),
     .sda_i(sda_i),
     .sda_o(sda_o),
-    .sda_t(sda_t),
 
     /*
      * Data register