Hi! I am in need of an MPC5200 I2C driver which operates in multi-master mode. My immediate need is for the MPC5200, but I'll be happy with mods to the main I2C tree which allow me to use any supported device in multi-master mode... ..and, since I haven't found anything in the tree to do this, I am currently hacking *my own* changes into the Denx 2.4.25 I2C driver "kit". I've spoken via email to Simon Vogl, who recommends that I use an ioctl-based command system to control my device. Yes, this would work, but would be specific to the MPC5200... and I may have to support multimaster mode on the MPC8260/8270 in the future. So, being a pedantic sort, I'm leaning towards changing "struct i2c_algorithm" and adding " int (*slave_xfer)" to be symmetrical with the "int (*master_xfer)" already in place. I know this means that I'll be "changing the world", but I'm really only interested in my own needs right now :-) LOL This change would required a retrofit to all of the current I2C drivers in the Denx kit (the base I'm working from). The retrofit would be a NULL in each non-5200-based driver's i2c_algorithm initialization data to provide the "unsupported" placeholder for the new function. This is a quickie change that I can roll into all of the drivers I'm not working on... but, like I said, I'm really only interested in *MY* driver... :-) I also know that I'll need to add the underlying support for the slave_xfer code to all of the internal routines within the I2C kit so that interrupt handlers and other top-down function calls work properly. This is something I'm quite willing to do... ...my driver... yada yada... :-) Unless, of course, someone has already implemented multimaster mode handlers for the I2C kit so I can operate a master device in slave mode until it needs to do a transmit... Thanks!!! \but -- Burt Janz 603.880.0482 bjanz at bit-net.com www.ccsneinc.com/bjanz
