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The Versatile PL110 implementations use multiple endpoints: from the PL111 port, the lines are routed through a PLD, and from there forked so the same lines go to a VGA DAC and an external TFT panel connector. This is discrete wireing so there is no way to turn of one output, i.e. this is really two endpoints, not two ports. We model this with multiple endpoints, so we need to loop over the available endpoints, check for panel or bridge on each and accumulate the result before continuing. The code already will give the panel preference over the bridge, if present, so the output will be sent to the panel if both a panel and a bridge is present on two endpoints of the same port. If they all return -EPROBE_DEFER we return -EPROBE_DEFER as well. If just one endpoint is present on the port, the behaviour is the same as before. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180206093540.8147-5-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.