Hi Randy, On Tue, 26 Jun 2018 14:07:49 -0700 Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > + > > +I3C Private SDR transfers > > +------------------------- > > + > > +Private SDR (Single Data Rate) transfers should be used for anything that is > > +device specific and does not require high transfer speed. > > + > > +It is the equivalent of I2C transfers but in the I3C world. Each transfer is > > +passed the device address (dynamic address assigned during DAA), a payload > > +and a direction. > > + > > +The only difference with I2C is that the transfer is much faster (typical SCL > > what is SCL? It's not used anywhere else in this doc. It's an acronym used by I²C, it means Serial Clock Line. I'll just replace that by "typical clock frequency is 12.5MHz". > > > +frequency is 12.5MHz). > > + > > +I3C HDR commands > > +---------------- > > + > > +HDR commands should be used for anything that is device specific and requires > > +high transfer speed. > > + > > +The first thing attached to an HDR command is the HDR mode. There are currently > > +3 different modes defined by the I3C specification (refer to the specification > > +for more details): > > + > > +* HDR-DDR: Double Data Rate mode > > +* HDR-TSP: Ternary Symbol Pure. Only usable on busses with no I2C devices > > +* HDR-TSL: Ternary Symbol Legacy. Usable on busses with I2C devices > > + > > +When sending an HDR command, the whole bus has to enter HDR mode, which is done > > +using a broadcast CCC command. > > +Once the bus has entered a specific HDR mode, the master sends the HDR command. > > +An HDR command is made of: > > + > > +* one 16-bits command word > > +* N 16-bits data words > > I supposed the I3C spec will tell me the byte order of these words on the bus? > or this doc could tell us here. It's big endian. I'll make it clear in this doc. I'll also fix all the other mistakes you pointed out. > > and you can add (if you want to): > Reviewed-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> I'll definitely add your R-b. Thanks for the review. Boris -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
