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The Renesas OS Timer (OSTM) driver contains two probe points, of which
only one should complete:
1. Early probe, using TIMER_OF_DECLARE(), to provide the sole
clocksource on (arm32) RZ/A1 and RZ/A2 SoCs,
2. Normal probe, using a platform driver, to provide additional timers
on (arm64 + riscv) RZ/G2L and similar SoCs.
The latter is needed because using OSTM on RZ/G2L requires manipulation
of its reset signal, which is not yet available at the time of early
probe, causing early probe to fail with -EPROBE_DEFER. It is only
enabled when building a kernel with support for the RZ/G2L family, so it
does not impact RZ/A1 and RZ/A2. Hence only one probe method can
complete on all affected systems.
As relying on the order of initialization of subsystems inside the
kernel is fragile, set the DT node's OF_POPULATED flag after a succesful
early probe. This makes sure the platform driver's probe is never
called after a successful early probe.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviwed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/bd027379713cbaafa21ffe9e848ebb7f475ca0e7.1710930542.git.geert+renesas@glider.be
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.