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The Gru device tree currently contains entries for the regulators ppvar_bigcpu, ppvar_litcpu, ppvar_gpu and ppvar_centerlogic; however, the regulators have not been enabled, due to the lack of binding and driver support for keeping the over-voltage protection (OVP) at bay and preventing unintended regulator shutdowns on voltage downshifts. Now, the vctrl regulator driver has been merged, along with new bindings for asymmetric settling time. The driver is OVP aware, it splits larger voltage decreases in multiple steps when necessary and adds required delays. This change renames each of the aforementioned regulators to <orig_name>_pwm and adds a new vctrl regulator named <orig_name>. The vctrl regulators use the voltage of their corresponding PWM regulator as control voltage. The OVP related values are empirical and stem from the Chrome OS kernel tree. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Brian Norris <briannorris@chromium.org> [fixed node names and parent supplies of gpu and centerlogic] Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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.