On Mon, Oct 04, 2010 at 07:41:34AM -0400, Jonathan Cameron wrote: > On 10/01/10 12:46, Samu Onkalo wrote: > > Add optional blockread function to interface driver. If available > > the chip driver uses it for data register access. For 12 bit device > > it reads 6 bytes to get 3*16bit data. For 8 bit device it reads out > > 5 bytes since every second byte is dummy. > > This optimizes bus usage and reduces number of operations and > > interrupts needed for one data update. > > Do we need to query if the i2c bus supports block reading or are they > all guaranteed to do so? > Not really. It may be true that block reads happen to be supported on all i2c controllers used on all boards using this chip, but that is pretty much a coincidence. > I'm guessing not seeing as i2c.h has a functionality bit for it... > I2C_FUNC_SMBUS_READ_BLOCK_DATA > > Otherwise looks good. Either justify that all i2c buses will work > or add the functionality check and you can add. > Should really have the check. And, for completeness, the driver should check if BYTE_DATA is supported as well. Besides, adding the check seems to be much less effort than trying to explain why it isn't needed. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
