K 10 svn:author V 3 ian K 8 svn:date V 27 2018-04-07T18:09:31.237916Z K 7 svn:log V 311 Add support for writing/changing spi device ivars. The SPI mode (polarity and phase) and the maximum bus speed can be changed. The chip select number cannot be changed, because the device instances which are children of spibus are inherently associated with the chip select number they were instantiated for. END