This patchset follows up on a suggestion by Markus for
allowing devices to implement integer properties which
don't have a default value specified in their Property
struct.
My use case for this is ARM, where we have a property
pmsav7-dregion whose correct default value depends on
which exact ARM CPU this is. That means we can't have
a single constant default value specified in the
DEFINE_PROP_UINT32(), but on the other hand if we just
prevent the qdev prop system from setting a default itself
we can naturally get the right default value by having
the structure field be correctly set to the default for
the CPU in the first place.
Patch 1 cleans up a corner case where we had just one
Property struct which was using the default value
(because it has a PropertyInfo with a non-NULL set_default_value
field) but not explicitly setting .defval.[ui].
Patch 2 adds .set_default to Property, uses it as the gate
on calling .set_default_value rather than just whether
.set_default_value is non-NULL, and adds some macros
so that devices can use the new no-default-value int props.
Patch 3 uses this so M3 and M4 have the right default
for the number of PMSA regions rather than getting the
different R7 default.
thanks
-- PMM
Peter Maydell (3):
qdev-properties.h: Explicitly set the default value for arraylen
properties
qdev: support properties which don't set a default value
target/arm: Make Cortex-M3 and M4 default to 8 PMSA regions
include/hw/qdev-core.h | 1 +
include/hw/qdev-properties.h | 21 +++++++++++++++++++++
hw/core/qdev.c | 2 +-
target/arm/cpu.c | 12 +++++++++++-
4 files changed, 34 insertions(+), 2 deletions(-)
--
2.7.4