serial: 8250_dw: Add support for IrDA SIR mode
Add a set_ldisc function to enable/disable IrDA SIR mode according to the new line discipline, if IrDA SIR mode is supported by the hardware configuration. Signed-off-by: Ed Blake <ed.blake@imgtec.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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