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edf9e04955
Compile testing configurations without REGMAP support enabled results in
a bunch of errors being reported:
../drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c:569:21: error: variable ‘rk_hdptx_phy_regmap_config’ has initializer but incomplete type
569 | static const struct regmap_config rk_hdptx_phy_regmap_config = {
| ^~~~~~~~~~~~~
../drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c:570:10: error: ‘const struct regmap_config’ has no member named ‘reg_bits’
570 | .reg_bits = 32,
| ^~~~~~~~
Note that selecting REGMAP alone is not enough, because of the following
liker error:
phy-rockchip-samsung-hdptx.c:(.text+0x10c): undefined reference to `__devm_regmap_init_mmio_clk'
Instead of the obvious fix to enable REGMAP_MMIO, select MFD_SYSCON,
which implicitly enables REGMAP_MMIO as well. The rationale is that the
driver has been already relying on the syscon functionality.
Moreover, without MFD_SYSCON enabled, the test coverage is reduced,
since the linker might not detect any potential undefined references
following syscon_regmap_lookup_by_phandle() invocation in
rk_hdptx_phy_probe() body. That is because the function would
unconditionally return -ENOTSUP, hence the compiler is free to optimize
out any unreachable code.
Finally ensure PHY_ROCKCHIP_SAMSUNG_HDPTX depends on HAS_IOMEM, as
required by MFD_SYSCON.
Fixes:
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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.