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While the standard UART port can use a single IRQ that 'sums' both RX and TX interrupts, the extended port cannot and has to use two different ISR, one for each direction. The standard port also has the hability to use two separate interrupts (one for each direction). The logic is then: either there is only one unnamed interrupt on the standard port and this interrupt must be used for both directions (this is legacy bindings); or all the interrupts must be described and named 'uart-sum' (if available), 'uart-rx', 'uart-tx' and two separate handlers for each direction will be used. Suggested-by: Allen Yan <yanwei@marvell.com> Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.