Hardware of various vendors, but very notably Rockchip, often uses
32-bit registers where the upper 16-bit half of the register is a
write-enable mask for the lower half.
Add hw_bitfield.h with two macros: FIELD_PREP_WM16, and
FIELD_PREP_WM16_CONST. The latter is a version that can be used in
initializers, like FIELD_PREP_CONST.
Import hw_bitfield.h from Linux commit 21368fcbb124 ("bitmap: introduce
hardware-specific bitfield operations"), first introduced in v6.18-rc1.
This contains two changes compared to the Linux version:
- include of linux/limit.h was dropped
- use of const_true() in FIELD_PREP_WM16_CONST() was dropped
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Acked-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Link: https://patch.msgid.link/20260803184314.2240153-2-jonas@kwiboo.se
Signed-off-by: Quentin Schulz <u-boot@0leil.net>
Jonas KarlmanandQuentin Schulz
0c68b88ce5