serial: 8250_dw: build Renesas RZN1 CPR value from DW_UART_CPR_* definitions

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Replace the magic CPR value for Renesas RZ/N1 with a composition using
DW_UART_CPR_* bit/field definitions and FIELD_PREP_CONST().

Introduce a helper macro to convert a FIFO size (bytes) into the CPR
FIFO_MODE field value, with BUILD_BUG_ON_ZERO() checks for alignment and
bounds. Use it to replace the literal FIFO_MODE values in the RZN1.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/20260429-ultrarisc-serial-v7-2-e475cce9e274@ultrarisc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jia Wang 2026-04-29 17:13:26 +08:00 • committed by Greg Kroah-Hartman

parent 6d7f4890bb

commit 07bb8459c4

2 changed files with 16 additions and 2 deletions

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10

drivers/tty/serial/8250/8250_dw.c

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8

drivers/tty/serial/8250/8250_dwlib.h

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