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.
I am sorry about too many submissions and top post reply. About second -
I do not know how to reply properly to this ML from GMail phone app. About first - I just
get very good feedback from Andy Shevchenko, and want to fix his review picks ASAP.
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.
Changes in v4:
- rebase onto tty-next branch
- added Kconfig mention of the chip
- used rounddown_power_of_two instead of fls and manual shift
- used FIELD_PREP instead of custom macro
- removed has_dld bit from common struct, replaced by check function,
which checks directly by s->devtype
- fixed tab count
- properly apply Vladimir Zapolskiy's tag to patch 2 only
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/Kconfig | 18 +++---
drivers/tty/serial/sc16is7xx.c | 62 +++++++++++++++++--
drivers/tty/serial/sc16is7xx_i2c.c | 1 +
drivers/tty/serial/sc16is7xx_spi.c | 1 +
5 files changed, 70 insertions(+), 13 deletions(-)
base-commit: c6795fbffc4547b40933ec368200bd4926a41b44
--
2.34.1
