include: linux: Import hw_bitfield.h from Linux v6.18

2026-08-11T15:35:22Z

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 Acked-by: Quentin Schulz Reviewed-by: Tom Rini Link: https://patch.msgid.link/20260803184314.2240153-2-jonas@kwiboo.se Signed-off-by: Quentin Schulz

u-boot.git/include/linux/hw_bitfield.h, branch main

include: linux: Import hw_bitfield.h from Linux v6.18