serial: fsl_lpuart: add DMA support
Add dma support for lpuart. This function depend on DMA driver. You can turn on it by write both the dmas and dma-name properties in dts node. Signed-off-by: NYuan Yao <yao.yuan@freescale.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NMark Rutland <mark.rutland@arm.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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