[PATCH] build some drivers only when compile-testing

From: Jiri Slaby
Date: Wed May 22 2013 - 05:18:31 EST

Some drivers can be built on more platforms than they run on. This
causes users and distributors packaging burden when they have to
manually deselect some drivers from their allmodconfigs. Or sometimes
it is even impossible to disable the drivers without patching the

Introduce a new config option COMPILE_TEST and make all those drivers
to depend on the platform they run on, or on the COMPILE_TEST option.
Now, when users/distributors choose COMPILE_TEST=n they will not have
the drivers in their allmodconfig setups, but developers still can
compile-test them with COMPILE_TEST=y.

Now the drivers where we use this new option:
* PTP_1588_CLOCK_PCH: The PCH EG20T is only compatible with Intel Atom
processors so it should depend on x86.
* FB_GEODE: Geode is 32-bit only so only enable it for X86_32.
* USB_CHIPIDEA_IMX: The OF_DEVICE dependency will be met on powerpc
systems -- which do not actually support the hardware via that

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Jeff Mahoney <jeffm@xxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Cc: Florian Tobias Schandinat <FlorianSchandinat@xxxxxx>
Cc: linux-geode@xxxxxxxxxxxxxxxxxxx
Cc: linux-fbdev@xxxxxxxxxxxxxxx
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: "Keller, Jacob E" <jacob.e.keller@xxxxxxxxx>
drivers/ptp/Kconfig | 1 +
drivers/usb/chipidea/Kconfig | 6 ++++++
drivers/usb/chipidea/Makefile | 4 +---
drivers/video/geode/Kconfig | 2 +-
init/Kconfig | 14 ++++++++++++++
5 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index 1ea6f1d..5be73ba 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -72,6 +72,7 @@ config DP83640_PHY

config PTP_1588_CLOCK_PCH
tristate "Intel PCH EG20T as PTP clock"
+ depends on X86 || COMPILE_TEST
select PTP_1588_CLOCK
This driver adds support for using the PCH EG20T as a PTP
diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index b2df442..3491d86 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -31,4 +31,10 @@ config USB_CHIPIDEA_DEBUG
Say Y here to enable debugging output of the ChipIdea driver.

+ bool "ChipIdea IMX support"
+ depends on OF_DEVICE && (ARM || COMPILE_TEST)
+ help
+ This option enables ChipIdea support on IMX.
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 4ab83e9..76d66ff 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -16,6 +16,4 @@ ifneq ($(CONFIG_PCI),)
obj-$(CONFIG_USB_CHIPIDEA) += ci13xxx_pci.o

-ifneq ($(CONFIG_OF_DEVICE),)
- obj-$(CONFIG_USB_CHIPIDEA) += ci13xxx_imx.o usbmisc_imx.o
+obj-$(CONFIG_USB_CHIPIDEA_IMX) += ci13xxx_imx.o usbmisc_imx.o
diff --git a/drivers/video/geode/Kconfig b/drivers/video/geode/Kconfig
index 21e351a..1e85552 100644
--- a/drivers/video/geode/Kconfig
+++ b/drivers/video/geode/Kconfig
@@ -3,7 +3,7 @@
config FB_GEODE
bool "AMD Geode family framebuffer support"
- depends on FB && PCI && X86
+ depends on FB && PCI && (X86_32 || (X86 && COMPILE_TEST))
Say 'Y' here to allow you to select framebuffer drivers for
the AMD Geode family of processors.
diff --git a/init/Kconfig b/init/Kconfig
index 7fb26a6..1233309 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -53,6 +53,20 @@ config CROSS_COMPILE
need to set this unless you want the configured kernel build
directory to select the cross-compiler automatically.

+ bool "Compile also drivers which will not load" if EXPERT
+ default n
+ help
+ Some drivers can be compiled on a different platform than they are
+ intended to be run on. Despite they cannot be loaded there (or even
+ when they load they cannot be used due to missing HW support),
+ developers still, opposing to distributors, might want to build such
+ drivers to compile-test them.
+ If you are a developer and want to build everything possible, say Y
+ here. If you are a user/distributor, say N here to exclude useless
+ drivers to be distributed.
string "Local version - append to kernel release"

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