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[v3,0/7] of: populate of_root node if bootloader doesn't

Message ID 20240202195909.3458162-1-sboyd@kernel.org
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Series of: populate of_root node if bootloader doesn't | expand

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Stephen Boyd Feb. 2, 2024, 7:59 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

Changes from v2 (https://lore.kernel.org/r/20240130004508.1700335-1-sboyd@kernel.org):
 * Reorder patches to have OF changes largely first
 * No longer modify initial_boot_params if ACPI=y
 * Put arm64 patch back to v1

Changes from v1 (https://lore.kernel.org/r/20240112200750.4062441-1-sboyd@kernel.org):
 * x86 patch included
 * arm64 knocks out initial dtb if acpi is in use
 * keep Kconfig hidden but def_bool enabled otherwise

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 (5):
  of: Always unflatten in unflatten_and_copy_device_tree()
  um: Unconditionally call unflatten_device_tree()
  x86/of: Unconditionally call unflatten_and_copy_device_tree()
  arm64: Unconditionally call unflatten_device_tree()
  of: Add KUnit test to confirm DTB is loaded

 arch/arm64/kernel/setup.c    |  3 +-
 arch/um/kernel/dtb.c         | 14 ++++----
 arch/x86/kernel/devicetree.c | 24 +++++++-------
 drivers/of/.kunitconfig      |  3 ++
 drivers/of/Kconfig           | 11 ++++++-
 drivers/of/Makefile          |  4 ++-
 drivers/of/empty_root.dts    |  6 ++++
 drivers/of/fdt.c             | 64 +++++++++++++++++++++++++++---------
 drivers/of/of_test.c         | 48 +++++++++++++++++++++++++++
 drivers/of/platform.c        |  3 --
 drivers/of/unittest.c        | 16 +++------
 include/linux/of.h           | 25 ++++++++------
 12 files changed, 158 insertions(+), 63 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>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <x86@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Saurabh Sengar <ssengar@linux.microsoft.com>

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

base-commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a