hw/arm/xilinx_zynq: Call qdev_connect_clock_in() before DeviceRealize

Clock canonical name is set in device_set_realized (see the block
added to hw/core/qdev.c in commit 0e6934f).
If we connect a clock after the device is realized, this code is
not executed. This is currently not a problem as this name is only
used for trace events, however this disrupt tracing.

Fix by calling qdev_connect_clock_in() before realizing.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20200803105647.22223-3-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/xilinx_zynq.c

@@ -222,18 +222,18 @@ static void zynq_init(MachineState *machine)
                           1, 0x0066, 0x0022, 0x0000, 0x0000, 0x0555, 0x2aa,
                           0);
 
-    /* Create slcr, keep a pointer to connect clocks */
-    slcr = qdev_new("xilinx,zynq_slcr");
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(slcr), &error_fatal);
-    sysbus_mmio_map(SYS_BUS_DEVICE(slcr), 0, 0xF8000000);
-
     /* Create the main clock source, and feed slcr with it */
     zynq_machine->ps_clk = CLOCK(object_new(TYPE_CLOCK));
     object_property_add_child(OBJECT(zynq_machine), "ps_clk",
                               OBJECT(zynq_machine->ps_clk));
     object_unref(OBJECT(zynq_machine->ps_clk));
     clock_set_hz(zynq_machine->ps_clk, PS_CLK_FREQUENCY);
+
+    /* Create slcr, keep a pointer to connect clocks */
+    slcr = qdev_new("xilinx,zynq_slcr");
     qdev_connect_clock_in(slcr, "ps_clk", zynq_machine->ps_clk);
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(slcr), &error_fatal);
+    sysbus_mmio_map(SYS_BUS_DEVICE(slcr), 0, 0xF8000000);
 
     dev = qdev_new(TYPE_A9MPCORE_PRIV);
     qdev_prop_set_uint32(dev, "num-cpu", 1);
@@ -257,19 +257,19 @@ static void zynq_init(MachineState *machine)
     dev = qdev_new(TYPE_CADENCE_UART);
     busdev = SYS_BUS_DEVICE(dev);
     qdev_prop_set_chr(dev, "chardev", serial_hd(0));
+    qdev_connect_clock_in(dev, "refclk",
+                          qdev_get_clock_out(slcr, "uart0_ref_clk"));
     sysbus_realize_and_unref(busdev, &error_fatal);
     sysbus_mmio_map(busdev, 0, 0xE0000000);
     sysbus_connect_irq(busdev, 0, pic[59 - IRQ_OFFSET]);
-    qdev_connect_clock_in(dev, "refclk",
-                          qdev_get_clock_out(slcr, "uart0_ref_clk"));
     dev = qdev_new(TYPE_CADENCE_UART);
     busdev = SYS_BUS_DEVICE(dev);
     qdev_prop_set_chr(dev, "chardev", serial_hd(1));
+    qdev_connect_clock_in(dev, "refclk",
+                          qdev_get_clock_out(slcr, "uart1_ref_clk"));
     sysbus_realize_and_unref(busdev, &error_fatal);
     sysbus_mmio_map(busdev, 0, 0xE0001000);
     sysbus_connect_irq(busdev, 0, pic[82 - IRQ_OFFSET]);
-    qdev_connect_clock_in(dev, "refclk",
-                          qdev_get_clock_out(slcr, "uart1_ref_clk"));
 
     sysbus_create_varargs("cadence_ttc", 0xF8001000,
             pic[42-IRQ_OFFSET], pic[43-IRQ_OFFSET], pic[44-IRQ_OFFSET], NULL);