NI16550_PMR_CAP_MASK

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u8 pmr_cap = pmr & NI16550_PMR_CAP_MASK;

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#define NI16550_PMR_NOT_IMPL FIELD_PREP(NI16550_PMR_CAP_MASK, 0) /* not implemented */

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#define NI16550_PMR_CAP_RS232 FIELD_PREP(NI16550_PMR_CAP_MASK, 1) /* RS-232 capable */

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#define NI16550_PMR_CAP_RS485 FIELD_PREP(NI16550_PMR_CAP_MASK, 2) /* RS-485 capable */

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#define NI16550_PMR_CAP_DUAL FIELD_PREP(NI16550_PMR_CAP_MASK, 3) /* dual-port */