Messages in this thread | | | Subject | Re: Applied "spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver" to the spi tree | From | Marek Vasut <> | Date | Wed, 13 Feb 2019 13:37:31 +0100 |
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On 2/13/19 1:16 PM, Mark Brown wrote: > On Wed, Feb 13, 2019 at 04:25:32PM +0800, masonccyang@mxic.com.tw 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
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