On Mon, Nov 18, 2013 at 01:40:22PM +0000, Grant Likely wrote: > Some hardware does that. That's what OHCI, EHCI, UHCI, XHCI, SDHCI, and > similar are all about. It always helps when well understood hardware > follows a register interface. It doesn't work for everything, but I > agree it would be good to have preferred hw interfaces for SPI & I2C.
You'd need something class based like USB, there's such massive variation in what the hardware is trying to do and the tradeoffs. A big issue is that especially with I2C many of the devices are primarily analogue devices implemnted in larger processes where the cost of adding additional digital logic can have a noticeable effect on the area and hence cost of the silicon.
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