[PATCH 0/7] of: Add and use of_machine_get_match() helper

[Geert Uytterhoeven <geert+renesas@glider.be>]

	Hi all,

Currently, there are two helpers to match the root compatible value
against an of_device_id array:
  - of_machine_device_match() returns true if a match is found,
  - of_machine_get_match_data() returns the match data if a match is
    found.
However, there is no helper that returns the actual of_device_id
structure corresponding to the match, leading to code duplication in
various drivers.  Worse, with the plan to make of_root private[1], more
open-coded users may appear.

Hence this series adds a new helper of_machine_get_match(), which
returns the match entry, and converts several drivers to make use of it.
Note that the new wrapper comes at no cost (binary size-wise),
as the variant returning bool can be a trivial inline wrapper.

One could argue we don't even need the variant that returns bool,
as
    "if (of_machine_device_match(...))" and
    "if (of_machine_get_match(...))",
and
    "if (!of_machine_device_match(...))" and
    "if (!of_machine_get_match(...))"
are equivalent.

The return type only matters when assigning to or returning an explicit
type, like in drivers/soc/tegra/common.c:

    bool soc_is_tegra(void)
    {
	    return of_machine_device_match(tegra_machine_match);
    }

Only the Renesas driver patch was tested on actual hardware.

Thanks for your comments!

[1] "[PATCH v2 0/9] soc: remove direct accesses to of_root from
     drivers/soc/"
    https://lore.kernel.org/20260223-soc-of-root-v2-0-b45da45903c8@oss.qualcomm.com/

Geert Uytterhoeven (7):
  of: Add of_machine_get_match() helper
  of: Convert to of_machine_get_match()
  cpufreq: airoha: Convert to of_machine_get_match()
  cpufreq: qcom-nvmem: Convert to of_machine_get_match()
  cpufreq: ti-cpufreq: Convert to of_machine_get_match()
  soc: qcom: pd-mapper: Convert to of_machine_get_match()
  soc: renesas: Convert to of_machine_get_match()

 drivers/cpufreq/airoha-cpufreq.c     |  7 +------
 drivers/cpufreq/qcom-cpufreq-nvmem.c | 16 ++--------------
 drivers/cpufreq/ti-cpufreq.c         | 12 +-----------
 drivers/of/base.c                    | 20 ++++++--------------
 drivers/soc/qcom/qcom_pd_mapper.c    |  8 +-------
 drivers/soc/renesas/renesas-soc.c    |  2 +-
 include/linux/of.h                   | 11 ++++++++---
 7 files changed, 20 insertions(+), 56 deletions(-)

-- 
2.43.0

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds