apollo: spi: Set 4 wire spi through parameters

Simplifies identifying which SPI are 4-wire or 3-wire.
Also, for vck190, since the SPI interface only has 3 outputs, route
adf4030 to the third.
The adf4030 linux driver defaults to 4-wire, and 3-wire (datasheet
default) can be set through devicetree property adi,spi-3wire-enable.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

projects/ad9084_ebz/common/ad9084_ebz_spi.v

@@ -36,7 +36,8 @@
 `timescale 1ns/100ps
 
 module ad9084_ebz_spi #(
-  parameter NUM_OF_SLAVES = 8
+  parameter NUM_OF_SLAVES = 8,
+  parameter IS_4WIRE = 8'b00000001
 ) (
   input  [NUM_OF_SLAVES-1:0] spi_csn,
   input                      spi_clk,
@@ -57,6 +58,8 @@ module ad9084_ebz_spi #(
   wire            spi_csn_s;
   wire            spi_enable_s;
 
+  wire [NUM_OF_SLAVES-1:0] spi_csn_4wire;
+
   // check on rising edge and change on falling edge
 
   assign spi_csn_s = & spi_csn;
@@ -86,7 +89,15 @@ module ad9084_ebz_spi #(
 
   // io buffer
 
-  assign spi_miso = (spi_csn[0] == 1'b0) ? spi_miso_in : spi_sdio;
+  genvar i;
+
+  generate
+    for (i = 0; i < NUM_OF_SLAVES ; i = i + 1) begin
+      assign spi_csn_4wire[i] = (IS_4WIRE[i] == 1'b1) ? spi_csn[i] : 1'b1;
+    end
+  endgenerate
+
+  assign spi_miso = (&spi_csn_4wire == 1'b0) ? spi_miso_in : spi_sdio;
   assign spi_sdio = (spi_enable_s == 1'b1) ? 1'bz : spi_mosi;
 
 endmodule

projects/ad9084_ebz/fm87/system_top.v

@@ -224,7 +224,8 @@ module system_top #(
   assign spi2_sclk    = spi_clk;
 
   ad9084_ebz_spi #(
-    .NUM_OF_SLAVES(2)
+    .NUM_OF_SLAVES(2),
+    .IS_4WIRE(2'b01)
   ) i_spi (
     .spi_csn (spi_csn[1:0]),
     .spi_clk (spi_clk),

projects/ad9084_ebz/vck190/system_top.v

@@ -262,13 +262,15 @@ module system_top #(
     .O (tx_device_clk));
 
   // spi
-  assign spi2_cs[5:0] = spi_csn[5:0];
+  assign spi2_cs[1:0] = spi_csn[1:0];
+  assign spi2_cs[4] = spi_csn[2];
   assign spi2_sclk    = spi_clk;
 
   ad9084_ebz_spi #(
-    .NUM_OF_SLAVES(2)
+    .NUM_OF_SLAVES(3),
+    .IS_4WIRE(3'b101)
   ) i_spi (
-    .spi_csn (spi_csn[1:0]),
+    .spi_csn (spi_csn[2:0]),
     .spi_clk (spi_clk),
     .spi_mosi (spi_sdio),
     .spi_miso (spi_sdo),

projects/ad9084_ebz/vcu118/system_top.v

@@ -313,7 +313,8 @@ module system_top #(
   assign spi2_sclk    = spi_clk;
 
   ad9084_ebz_spi #(
-    .NUM_OF_SLAVES(2)
+    .NUM_OF_SLAVES(2),
+    .IS_4WIRE(2'b01)
   ) i_spi (
     .spi_csn (spi_csn[1:0]),
     .spi_clk (spi_clk),

projects/ad9084_ebz/vpk180/system_top.v

@@ -286,7 +286,8 @@ module system_top #(
   assign spi2_sclk    = spi_clk;
 
   ad9084_ebz_spi #(
-    .NUM_OF_SLAVES(2)
+    .NUM_OF_SLAVES(2),
+    .IS_4WIRE(2'b01)
   ) i_spi (
     .spi_csn (spi_csn[1:0]),
     .spi_clk (spi_clk),