On Wed, Feb 19, 2025 at 4:08 AM Binbin Zhou <zhoubinbin@xxxxxxxxxxx> wrote: > > According to the chip manual, the I2C register access type of > Loongson-2K2000/LS7A is "B", so we can only access registers in byte > form (readb/writeb). readb()/writeb() > > Although Loongson-2K0500/Loongson-2K1000 do not have similar > constraints, register accesses in byte form also behave correctly. > > Also, in hardware, the frequency division registers are defined as two > separate registers (high 8-bit and low 8-bit), so we just access them > directly as bytes. Reviewed-by: Andy Shevchenko <andy@xxxxxxxxxx> ... > + /* > + * According to the chip manual, we can only access the registers as bytes, > + * otherwise the high bits will be truncated. > + * So set the I2C frequency with a sequential writeb instead of writew. writeb() writew() > + */ -- With Best Regards, Andy Shevchenko
