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Currently, the GPIO interface is said to Open Drain if it is Single Ended and active LOW. Similarly, it is said as Open Source if it is Single Ended and active HIGH. The active HIGH/LOW is used in the interface for setting the pin state to HIGH or LOW when enabling/disabling the interface. In Open Drain interface, pin is set to HIGH by putting pin in high impedance and LOW by driving to the LOW. In Open Source interface, pin is set to HIGH by driving pin to HIGH and set to LOW by putting pin in high impedance. With above, the Open Drain/Source is unrelated to the active LOW/HIGH in interface. There is interface where the enable/disable of interface is ether active LOW or HIGH but it is Open Drain type. Hence decouple the Open Drain with Single Ended + Active LOW and Open Source with Single Ended + Active HIGH. Adding different flag for the Open Drain/Open Source which is valid only when Single ended flag is enabled. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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.