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[0/6] of: populate of_root node if bootloader doesn't

Message ID 20240112200750.4062441-1-sboyd@kernel.org
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Series of: populate of_root node if bootloader doesn't | expand

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Stephen Boyd Jan. 12, 2024, 8:07 p.m. UTC 
Arch maintainers, please ack/review patches.

This is a resend of a series from Frank last year[1]. I worked in Rob's
review comments to unconditionally call unflatten_device_tree() and
fixup/audit calls to of_have_populated_dt() so that behavior doesn't
change.

I need this series so I can add DT based tests in the clk framework.
Either I can merge it through the clk tree once everyone is happy, or
Rob can merge it through the DT tree and provide some branch so I can
base clk patches on it.

Changes from Frank's series[1]:
 * Add a DTB loaded kunit test
 * Make of_have_populated_dt() return false if the DTB isn't from the
   bootloader
 * Architecture calls made unconditional so that a root node is always
   made

Frank Rowand (2):
  of: Create of_root if no dtb provided by firmware
  of: unittest: treat missing of_root as error instead of fixing up

Stephen Boyd (4):
  arm64: Unconditionally call unflatten_device_tree()
  um: Unconditionally call unflatten_device_tree()
  of: Always unflatten in unflatten_and_copy_device_tree()
  of: Add KUnit test to confirm DTB is loaded

 arch/arm64/kernel/setup.c |  3 +-
 arch/um/kernel/dtb.c      | 14 +++---
 drivers/of/.kunitconfig   |  3 ++
 drivers/of/Kconfig        | 16 ++++++-
 drivers/of/Makefile       |  4 +-
 drivers/of/empty_root.dts |  6 +++
 drivers/of/fdt.c          | 57 +++++++++++++++++------
 drivers/of/of_test.c      | 98 +++++++++++++++++++++++++++++++++++++++
 drivers/of/platform.c     |  3 --
 drivers/of/unittest.c     | 16 ++-----
 include/linux/of.h        | 17 +++++--
 11 files changed, 191 insertions(+), 46 deletions(-)
 create mode 100644 drivers/of/.kunitconfig
 create mode 100644 drivers/of/empty_root.dts
 create mode 100644 drivers/of/of_test.c

Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Gow <davidgow@google.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Will Deacon <will@kernel.org>

[1] https://lore.kernel.org/r/20230317053415.2254616-1-frowand.list@gmail.com

base-commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a