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We have been holding back on adding an API for fetching GPIO handles directly from device nodes, strongly preferring to get it from the spawn devices instead. The fwnode interface however already contains an API for doing this, as it is used for opaque device tree nodes or ACPI nodes for getting handles to LEDs and keys that use GPIO: those are specified as one child per LED/key in the device tree and are not individual devices. However regulators present a special problem as they already have helper functions to traverse the device tree from a regulator node and two levels down to fill in data, and as it already traverses GPIO nodes in its own way, and already holds a pointer to each regulators device tree node, it makes most sense to export an API to fetch the GPIO descriptor directly from the node. We only support the devm_* version for now, hopefully no non-devres version will be needed. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.