From: Konstantin Pugin <ria.freelander@xxxxxxxxx> EXAR XR20M1172 UART is mostly SC16IS762-compatible, but it has additional register which can change UART multiplier to 4x and 8x, similar to UPF_MAGIC_MULTIPLIER does. So, I used this flag to guard access to its specific DLD register. It seems than other EXAR SPI UART modules also have this register, but I tested only XR20M1172. Yes, in datasheet this register is called "DLD - Divisor Fractional" or "DLD - Divisor Fractional Register", calling depends on datasheet version. Changes in v2: - use full name in git authorship Changes in v3: - change formatting of commit messages to unify width - rework commit messages according to code review - add XR20M117X namespace for EXAR-specific register - do not use UPF_MAGIC_MULTIPLIER for checking EXAR chip, use s->devtype directly - replace while loop to fls function and expanded check - sort compatibles - reformat multiline comment. Konstantin Pugin (3): serial: sc16is7xx: announce support of SER_RS485_RTS_ON_SEND dt-bindings: sc16is7xx: Add compatible line for XR20M1172 UART serial: sc16is7xx: add support for EXAR XR20M1172 UART .../bindings/serial/nxp,sc16is7xx.yaml | 1 + drivers/tty/serial/sc16is7xx.c | 57 +++++++++++++++++-- 2 files changed, 53 insertions(+), 5 deletions(-) -- 2.34.1