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The RTC controls the input source of the main 32kHz oscillator in the system, feeding it to the clock unit too. By default, this is using an internal, very inaccurate (+/- 30%) oscillator with a divider to make it roughly around 32kHz. This is however quite impractical for the RTC, since our time will not be tracked properly. Since this oscillator is an input of the main clock unit, and since that clock unit will be probed using CLK_OF_DECLARE, we have to use it as well, leading to a two stage probe: one to enable the clock, the other one to enable the RTC. There is also a slight change in the binding that is required (and should have been from the beginning), since we'll need a phandle to the external oscillator used on that board. We support the old binding by not allowing to switch to the external oscillator and only using the internal one (which was the previous behaviour) in the case where we're missing that phandle. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> |
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| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| .gitignore | ||
| .mailmap | ||
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| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.