Only compile in PCIe support if the board really uses it. Provide
a __weak stub for the init function if e.g. FVP is being built.

Signed-off-by: Ryan Harkin <ryan.har...@linaro.org>
Acked-by: Linus Walleij <linus.wall...@linaro.org>
---
 board/armltd/vexpress64/Makefile     | 3 ++-
 board/armltd/vexpress64/pcie.c       | 2 --
 board/armltd/vexpress64/vexpress64.c | 7 +++++++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/board/armltd/vexpress64/Makefile b/board/armltd/vexpress64/Makefile
index a35db40..b4391a7 100644
--- a/board/armltd/vexpress64/Makefile
+++ b/board/armltd/vexpress64/Makefile
@@ -5,4 +5,5 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
-obj-y  := vexpress64.o pcie.o
+obj-y  := vexpress64.o
+obj-$(CONFIG_TARGET_VEXPRESS64_JUNO)   += pcie.o
diff --git a/board/armltd/vexpress64/pcie.c b/board/armltd/vexpress64/pcie.c
index 7b999e8..311c450 100644
--- a/board/armltd/vexpress64/pcie.c
+++ b/board/armltd/vexpress64/pcie.c
@@ -191,7 +191,5 @@ void xr3pci_init(void)
 
 void vexpress64_pcie_init(void)
 {
-#ifdef CONFIG_TARGET_VEXPRESS64_JUNO
        xr3pci_init();
-#endif
 }
diff --git a/board/armltd/vexpress64/vexpress64.c 
b/board/armltd/vexpress64/vexpress64.c
index f4e8084..3add099 100644
--- a/board/armltd/vexpress64/vexpress64.c
+++ b/board/armltd/vexpress64/vexpress64.c
@@ -28,6 +28,13 @@ U_BOOT_DEVICE(vexpress_serials) = {
        .platdata = &serial_platdata,
 };
 
+/* This function gets replaced by platforms supporting PCIe.
+ * The replacement function, eg. on Juno, initialises the PCIe bus.
+ */
+__weak void vexpress64_pcie_init(void)
+{
+}
+
 int board_init(void)
 {
        vexpress64_pcie_init();
-- 
2.1.4

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