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The current error handling for calls such as devm_clk_get_enabled() in the adi-axi-dac probe() function means that, if a property such as 'clocks' (for example) is not present in the devicetree when booting a kernel with the driver enabled, the resulting error message will be vague, e.g.: |adi_axi_dac 44a00000.dac: probe with driver adi_axi_dac failed with error -2 Change the devm_clk_get_enabled(), devm_regmap_init_mmio(), and devm_iio_backend_register() checks to use dev_err_probe() with some context for easier debugging. After the change: |adi_axi_dac 44a00000.dac: error -ENOENT: failed to get clock |adi_axi_dac 44a00000.dac: probe with driver adi_axi_dac failed with error -2 Suggested-by: Nuno Sa <nuno.sa@analog.com> Tested-by: Angelo Dureghello <adureghello@baylibre.com> Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com> Link: https://patch.msgid.link/20240617151820.3337034-1-tgamblin@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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.