[PATCH v9 00/12] Device property improvements, add %pfw format specifier

Sakari Ailus
2019-10-03T12:32:35Z

Hi all,

This set adds functionality into the device property API (counting a
node's parents as well as obtaining its name) in order to support printing
fwnode names using a new conversion specifier "%pfw". The names that are
produced are equivalent to its OF counterpart "%pOF" on OF systems for the
two supported modifiers ("f" and "P").

Printing a node's name is something that's been available on OF for a long
time and if something is converted to device property API (such as the
V4L2 fwnode framework) it always got removed of a nice feature that was
sometimes essential in debugging. With this set, that no longer is the
case.

Note: the set now depends on commit b295c3e39c13 ("tools lib traceevent:
Convert remaining %p[fF] users to %p[sS]") and commit 2d44d165e939 ("scsi:
lpfc: Convert existing %pf users to %ps") which both are in v5.4-rc1.

Note 2: There's no full v8 set as I sent a patch fixing a single issue but
there turned out to be a little more to fix, making this one v9.

since v7:

- Reword warning on re-use of %pf and %pF.

- Remove %pf and %pF support from vbin_printf() as well.

- Removed the first patch (now commit b295c3e39c13 ("tools lib traceevent:
Convert remaining %p[fF] users to %p[sS]")) from the set as it was
already merged through Arnoldo Carvalho de Melo's tree. Added
Depends-on: tag to the same patch.

since v6:

- Added a patch for a warning note on re-using obsolete %pf oand %pF
extensions.

- Rework %pfw validatition in checkpatch.pl according to Joe's comments.

- Unwrap a line wrapped by a previous versions in get_bprint_format().

- Handle %pf and %pF modifiers again in make_bprint_args() in case they're
no followed by 'w'.

since v5:

- Added a patch to convert %pf to %ps in tools/lib/traceevent.c (first in
the set).

- Fix ReST syntax in Documentation/core-api/printk-formats.rst.

- Fix returning root swnode name in patch "device property: Add
fwnode_get_name for returning the name of a node". Use to_swnode()
directly as well in the same patch.

- Tests: take root node name into account, use direct indices and remove
the comma from the guardian entry.

- Add a comment on how fwnode_full_name_string() enumerates the nodes.

- Fix error string in fwnode_string().

- Move 'f' + default case as last in the switch in fwnode_string().

- Fix %pfw validation in checkpatch.pl.

since v4:

- Improved documentation for fwnode_get_nth_parent().

- Removed comma from the guardian entry in fwnode_pointer() testcase.

since v3:

- Remove underscores in argument name of fwnode_count_parents().

- Re-introduce "%pO?" error string.

- Unwrap a call to string() in fwnode_string().

- Removed a useless Depends-on: on a patch that was merged long ago.

- Unwrap a Fixes: line.

- Added a patch to move fwnode_get_parent() up to make the review of the
following patch easier.

since v2:

- Better comments in acpi_fwnode_get_name_prefix().

- Added swnode implementation.

- Fixed swnode refcounting in get_parent() ("swnode: Get reference to
parent swnode in get_parent op")

- Make argument to to_software_node() const (a new patch)

- Factored out confusingly named kobject_string() that had a single
caller.

- Cleaner fwnode_count_parents() implementation (as discussed in review).

- Made fwnode_count_parents() argument const.

- Added tests (last patch in the set).

since v1:

- Add patch to remove support for %pf and %pF (depends on another patch
removing all use of %pf and %pF) (now 4th patch)

- Fix kerneldoc argument documentation for fwnode_get_name (2nd patch)

- Align kerneldoc style with the rest of drivers/base/property.c (no extra
newline after function name)

- Make checkpatch.pl complain about "%pf" not followed by "w" (6th patch)

- WARN_ONCE() on use of invalid conversion specifiers ("%pf" not followed
by "w")

Sakari Ailus (12):
software node: Get reference to parent swnode in get_parent op
software node: Make argument to to_software_node const
device property: Move fwnode_get_parent() up
device property: Add functions for accessing node's parents
device property: Add fwnode_get_name for returning the name of a node
device property: Add a function to obtain a node's prefix
lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps
lib/vsprintf: Add a note on re-using %pf or %pF
lib/vsprintf: Make use of fwnode API to obtain node names and
separators
lib/vsprintf: OF nodes are first and foremost, struct device_nodes
lib/vsprintf: Add %pfw conversion specifier for printing fwnode names
lib/test_printf: Add tests for %pfw printk modifier

Documentation/core-api/printk-formats.rst | 34 ++++++---
drivers/acpi/property.c | 48 ++++++++++++
drivers/base/property.c | 83 ++++++++++++++++++--
drivers/base/swnode.c | 43 ++++++++++-
drivers/of/property.c | 16 ++++
include/linux/fwnode.h | 4 +
include/linux/property.h | 8 +-
lib/test_printf.c | 32 ++++++++
lib/vsprintf.c | 93 ++++++++++++++---------
scripts/checkpatch.pl | 9 ++-
10 files changed, 309 insertions(+), 61 deletions(-)

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2.20.1