Hi Nick, > +#define APPLE_S5L_UTRSTAT_RXTO_LEGACY BIT(3) > #define APPLE_S5L_UTRSTAT_RXTHRESH BIT(4) > #define APPLE_S5L_UTRSTAT_TXTHRESH BIT(5) > #define APPLE_S5L_UTRSTAT_RXTO BIT(9) > -#define APPLE_S5L_UTRSTAT_ALL_FLAGS (0x3f0) > +#define APPLE_S5L_UTRSTAT_ALL_FLAGS (0x3f8) As you are here, you could use genmask GENMASK(0xff, 3) Andi