On 1/28/19 2:38 AM, masonccyang@xxxxxxxxxxx wrote: > Hi Marek, Hi, >> "Marek Vasut" <marek.vasut@xxxxxxxxx> >> >> >> > +module_platform_driver(rpc_spi_driver); >> >> >> >> >> >> RPC is not a SPI controller, it's a SPI and HF controller. >> >> >> >> >> >> Also, how difficult will it be to add the HF support ? >> >> > >> >> > One of my customers needs RPC SPI driver for our company's >> >> > Octal-Flash,MX25UW51245G. >> >> > We don't have HF product and hope you could understanding. >> >> >> >> I am worried that when we need to add RPC HF support (which is what all >> >> boards but the D3 Draak use), we will have to rewrite the entire driver >> >> and/or convert it to MFD and that would be a tremendous > undertaking. I'd >> >> prefer to have the driver ready for the HF addition before it's > accepted >> >> upstream. >> >> >> > >> > I think maybe your concerned would be happened only if HF driver > goes with >> > spi-mem layer. >> > >> > A comment for HF from Daniel Fishman. FYR. >> > >> > https://www.quora.com/What-is-a-hyper-flash-memory-and-how-is-it- >> different-from-normal-flash-memory >> >> I have a decent idea what HF and SPI NOR are, since I wrote the RPC >> driver for both HF and SPI mode for U-Boot (as I mentioned earlier). >> >> The HF in Linux would use the CFI NOR part of MTD framework. My concern >> is that when we need to add HF support into this driver, this driver >> will have to be basically rewritten, since the architecture won't allow >> for that. I'd like to avoid that, since the majority of Gen3 boards, >> expect for the D3 Draak, use RPC in HF mode. > > FYI~ > > MX25UW51245g(64MByte Octa) S26KL512S(64MByte HF) > 8 IO 8 IO > 200MHz DDR@1.8v 166MHz DDR@1.8v > > support Read-while-write Not support > good for OTA,etc > powerful application What does that mean ? -- Best regards, Marek Vasut
