On 11/18/2016 11:37 AM, Benjamin Fair wrote:
On 11/09/2016 10:58 AM, Benjamin Fair wrote:
This patch extends the capability of libfdt to parse the contents of device
trees in a similar manner to fdt_address_cells and fdt_size_cells.
It adds a helper function which reads the address and size of a device from
the reg property and performs basic sanity checks.
It does not perform translation to a physical address using the ranges
properties of parents, but this enhancement may be added as a separate
function in the future.
Signed-off-by: Benjamin Fair <b-fair@xxxxxx>
---
The intent of this patch is similar to the commit "libfdt: Add helpers to read
#address-cells and #size-cells" [1].
It is related to "libfdt: add address translation support" [2] but does not
attempt to perform address translation and was written from scratch rather than
reusing GPL code. If the issues with that patch are resolved, that
functionality will complement what is added in this patch.
libfdt/fdt_addresses.c | 62 ++++++++++++++++++++++++++++++++++++++++++
libfdt/libfdt.h | 29 ++++++++++++++++++++
libfdt/version.lds | 1 +
tests/.gitignore | 1 +
tests/Makefile.tests | 2 +-
tests/addr_size.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++
tests/addresses.dts | 11 ++++++++
tests/run_tests.sh | 1 +
8 files changed, 180 insertions(+), 1 deletion(-)
create mode 100644 tests/addr_size.c
I think in a lot of places this simple translation of DT can easily be
benefiting.
[1] http://www.spinics.net/lists/devicetree-compiler/msg00113.html
[2] http://www.spinics.net/lists/devicetree-compiler/msg00093.html
Rob, David,
The motivation started off by wanting to have a better integration of
libfdt and dt support in ATF[2] - and basic stuff is to be able to
read address from a node - not that we could'nt do something similar
as a ATF specific library... but common might be better for all of
libfdt users, no?
Do you folks have a suggestion as to what might be a better direction
to take here?
Original patch for reference (since my google-fu failed to be able to
find a devicetree-compiler patchworks)[1]:
[1] http://www.spinics.net/lists/devicetree-compiler/msg00844.html
[2]
https://github.com/ARM-software/arm-trusted-firmware/pull/747#issuecomment-259727132
--
Regards,
Nishanth Menon
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