u-boot.git/scripts/dtc, branch v2020.04 Unnamed repository; edit this file 'description' to name the repository. dtc: add ability to make nodes conditional on them being referenced 2020-02-06T02:33:46+00:00 Maxime Ripard maxime.ripard@bootlin.com 2020-01-21T10:23:17+00:00 5ed2dc5623b45ebd51d71f7daffd0cbcbc441186 This is needed when importing mainline DTs into U-Boot, as some started using this /omit-if-no-ref/ tag, so won't compile with U-Boot's current dtc copy. This is just a cherry-pick of the patch introducing this feature. Original commit message from Maxime: ------------------ A number of platforms have a need to reduce the number of DT nodes, mostly because of two similar constraints: the size of the DT blob, and the time it takes to parse it. As the DT is used in more and more SoCs, and by more projects, some constraints start to appear in bootloaders running from SRAM with an order of magnitude of 10kB. A typical DT is in the same order of magnitude, so any effort to reduce the blob size is welcome in such an environment. Some platforms also want to reach very fast boot time, and the time it takes to parse a typical DT starts to be noticeable. Both of these issues can be mitigated by reducing the number of nodes in the DT. The biggest provider of nodes is usually the pin controller and its subnodes, usually one for each valid pin configuration in a given SoC. Obviously, a single, fixed, set of these nodes will be used by a given board, so we can introduce a node property that will tell the DT compiler to drop the nodes when they are not referenced in the tree, and as such wouldn't be useful in the targetted system. Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org> 
This is needed when importing mainline DTs into U-Boot, as some started
using this /omit-if-no-ref/ tag, so won't compile with U-Boot's current
dtc copy. This is just a cherry-pick of the patch introducing this
feature.
Original commit message from Maxime:
------------------
A number of platforms have a need to reduce the number of DT nodes,
mostly because of two similar constraints: the size of the DT blob, and
the time it takes to parse it.

As the DT is used in more and more SoCs, and by more projects, some
constraints start to appear in bootloaders running from SRAM with an
order of magnitude of 10kB. A typical DT is in the same order of
magnitude, so any effort to reduce the blob size is welcome in such an
environment.

Some platforms also want to reach very fast boot time, and the time it
takes to parse a typical DT starts to be noticeable.

Both of these issues can be mitigated by reducing the number of nodes in
the DT. The biggest provider of nodes is usually the pin controller and
its subnodes, usually one for each valid pin configuration in a given
SoC.

Obviously, a single, fixed, set of these nodes will be used by a given
board, so we can introduce a node property that will tell the DT
compiler to drop the nodes when they are not referenced in the tree, and
as such wouldn't be useful in the targetted system.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Remove redundant YYLOC global declaration 2020-01-30T18:30:35+00:00 Peter Robinson pbrobinson@gmail.com 2020-01-30T09:37:15+00:00 018921ee79d3f30893614b3b2b63b588d8544f73 Same as the upstream fix for building dtc with gcc 10. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> 
Same as the upstream fix for building dtc with gcc 10.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
libfdt: Revert 6dcb8ba4 from upstream libfdt 2020-01-30T18:30:35+00:00 Tom Rini trini@konsulko.com 2020-01-27T17:10:31+00:00 e8c2d25845c72c7202a628a97d45e31beea40668 In upstream libfdt, 6dcb8ba4 "libfdt: Add helpers for accessing unaligned words" introduced changes to support unaligned reads for ARM platforms and 11738cf01f15 "libfdt: Don't use memcpy to handle unaligned reads on ARM" improved the performance of these helpers. In practice however, this only occurs when the user has forced the device tree to be placed in memory in a non-aligned way, which in turn violates both our rules and the Linux Kernel rules for how things must reside in memory to function. This "in practice" part is important as handling these other cases adds visible (1 second or more) delay to boot in what would be considered the fast path of the code. Cc: Patrice CHOTARD <patrice.chotard@st.com> Cc: Patrick DELAUNAY <patrick.delaunay@st.com> Link: https://www.spinics.net/lists/devicetree-compiler/msg02972.html Signed-off-by: Tom Rini <trini@konsulko.com> Tested-by: Patrice Chotard <patrice.chotard@st.com> 
In upstream libfdt, 6dcb8ba4 "libfdt: Add helpers for accessing
unaligned words" introduced changes to support unaligned reads for ARM
platforms and 11738cf01f15 "libfdt: Don't use memcpy to handle unaligned
reads on ARM" improved the performance of these helpers.

In practice however, this only occurs when the user has forced the
device tree to be placed in memory in a non-aligned way, which in turn
violates both our rules and the Linux Kernel rules for how things must
reside in memory to function.

This "in practice" part is important as handling these other cases adds
visible (1 second or more) delay to boot in what would be considered the
fast path of the code.

Cc: Patrice CHOTARD <patrice.chotard@st.com>
Cc: Patrick DELAUNAY <patrick.delaunay@st.com>
Link: https://www.spinics.net/lists/devicetree-compiler/msg02972.html
Signed-off-by: Tom Rini <trini@konsulko.com>
Tested-by: Patrice Chotard <patrice.chotard@st.com>
scripts: dtc: ignore files generated generated by python 2019-11-23T19:53:48+00:00 Bartosz Golaszewski bgolaszewski@baylibre.com 2019-11-13T13:42:41+00:00 163b7641f8d039ecf84abb8ac1ed9eff655c14e4 Add __pycache__ to ignored files and extend the rule for _libfdt to also include generated shared objects (e.g. _libfdt.cpython-37m-x86_64-linux-gnu.so). Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> 
Add __pycache__ to ignored files and extend the rule for _libfdt to also
include generated shared objects (e.g. _libfdt.cpython-37m-x86_64-linux-gnu.so).

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
pylibfdt: Correct the type for fdt_property_stub() 2019-11-05T01:15:32+00:00 Simon Glass sjg@chromium.org 2019-10-31T13:43:01+00:00 97de532e59be97281aabc327e93939550881e2ea This function should use a void * type, not char *. This causes an error: TypeError: in method 'fdt_property_stub', argument 3 of type 'char const *' Fix it. Signed-off-by: Simon Glass <sjg@chromium.org> 
This function should use a void * type, not char *. This causes an error:

TypeError: in method 'fdt_property_stub', argument 3 of type 'char const *'

Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
pylibfdt: Sync up with upstream 2019-11-05T01:15:32+00:00 Simon Glass sjg@chromium.org 2019-10-31T13:43:00+00:00 903fe17aa8c87de7b943ba02babaf34b53097336 Sync up the libfdt Python bindings with upstream, commit: 430419c (tests: fix some python warnings) Signed-off-by: Simon Glass <sjg@chromium.org> 
Sync up the libfdt Python bindings with upstream, commit:

430419c (tests: fix some python warnings)

Signed-off-by: Simon Glass <sjg@chromium.org>
pylibfdt: Convert to Python 3 2019-11-05T01:15:32+00:00 Simon Glass sjg@chromium.org 2019-10-31T13:42:59+00:00 b4cf5f1df741e8781bed6149291823cd1a4b8baa Build this swig module with Python 3. Signed-off-by: Simon Glass <sjg@chromium.org> 
Build this swig module with Python 3.

Signed-off-by: Simon Glass <sjg@chromium.org>
fdt: Sync up to the latest libfdt 2019-11-05T01:15:32+00:00 Simon Glass sjg@chromium.org 2019-10-27T15:47:42+00:00 f0921f5098d8d98ac38121837aaf7c4b4cb13bb4 Bring over the fdt from this commit: 430419c (origin/master) tests: fix some python warnings adding in the 'assumptions' series designed to reduce code size. Signed-off-by: Simon Glass <sjg@chromium.org> 
Bring over the fdt from this commit:

430419c (origin/master) tests: fix some python warnings

adding in the 'assumptions' series designed to reduce code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
libfdt: fix typo on comment 2019-10-15T14:40:03+00:00 Giulio Benetti giulio.benetti@benettiengineering.com 2019-09-18T15:22:13+00:00 4ab6a45ec7ee6380f66098814f0d2e46a64158e8 Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com> 
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
libfdt: Allow #size-cells of 0 2019-10-15T14:40:02+00:00 Matthias Brugger mbrugger@suse.com 2019-09-05T08:48:48+00:00 8076fc298ee1004cfbd9f9f4882931aff1ffda06 The commit "libfdt: fdt_address_cells() and fdt_size_cells()" introduced a bug as it consolidated code between the helpers for getting be 0, and is frequently found so in practice for /cpus. IEEE1275 only requires implementations to handle 1..4 for #address-cells, although one could make a case for #address-cells == #size-cells == 0 being used to represent a bridge with a single port. While we're there, it's not totally obvious that the existing implicit cast of a u32 to int will give the correct results according to strict C, although it does work in practice. Straighten that up to cast only after we've made our range checks. This is based on upstream commit: b8d6eca ("libfdt: Allow #size-cells of 0") but misses the test cases,as we don't implement them in U-Boot. Signed-off-by: Matthias Brugger <mbrugger@suse.com> 
The commit "libfdt: fdt_address_cells() and fdt_size_cells()" introduced
a bug as it consolidated code between the helpers for getting
be 0, and is frequently found so in practice for /cpus.  IEEE1275 only
requires implementations to handle 1..4 for #address-cells, although one
could make a case for #address-cells == #size-cells == 0 being used to
represent a bridge with a single port.

While we're there, it's not totally obvious that the existing implicit
cast of a u32 to int will give the correct results according to strict C,
although it does work in practice.  Straighten that up to cast only after
we've made our range checks.

This is based on upstream commit:
b8d6eca ("libfdt: Allow #size-cells of 0")
but misses the test cases,as we don't implement them in U-Boot.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>