On 2/13/19 1:16 PM, Mark Brown wrote: > On Wed, Feb 13, 2019 at 04:25:32PM +0800, masonccyang@xxxxxxxxxxx wrote: > >> From current mainline branch, MFD seems support the device which is on >> the same hardware bus(i.e, I2C, SPI, MMIO and SPMI)for multi-function >> by Read/Write the common same registers. > > That's most MFDs but there are some that do some level of enumeration > (even if it's just looking at the device ID that got registered) to > decide what subdevices get registered, that's what people are suggesting > here I think. Right. Although I think some of the code could be shared between the SPI and HF modes. >> I am checking and not sure if MMIO of MFD could support RPC-IF for >> different hardware bus on SPI and CFI. >> I also doubt if this method is a correct solution for RPC-IF works >> either in SPI mode or CFI mode. > > For MMIO devices MFD just passes through the parent resources. > -- Best regards, Marek Vasut
