On Wed, Jun 11, 2014 at 11:17:28AM +0200, Boris BREZILLON wrote: > Hello, > > This series adds support for the P2WI block used by some Allwinner boards > to interface with the AXP221 PMIC. > > The P2WI controller looks like an SMBus controller which only supports byte > data transfers. But, it differs from standard SMBus protocol on several > aspects: > - it supports only one slave device, and thus drop the address field > - it adds a parity bit every 8bits of data > - only one read access is required to read a byte (instead of a write > followed by a read access in standard SMBus protocol) > - there's no Ack bit after each byte transfer > > This means this bus cannot be used to interface with standard SMBus > devices (the only known device to support this interface is the AXP221 > PMIC). > However the P2WI protocol is close enough to SMBus to be integrated in > the I2C subsystem (see this thread [1] for detailed reasons that led to > integrating this driver in the I2C subsystem). > > [1] http://www.spinics.net/lists/linux-i2c/msg15066.html Applied to for-next, thanks!
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