On 12/05/2018 09:39 AM, masonccyang@xxxxxxxxxxx wrote: > Hi Marek, Hi, >> "Marek Vasut" <marek.vasut@xxxxxxxxx> >> 2018/12/05 上午 10:04 >> >> To >> >> "Mason Yang" <masonccyang@xxxxxxxxxxx>, broonie@xxxxxxxxxx, linux- >> kernel@xxxxxxxxxxxxxxx, linux-spi@xxxxxxxxxxxxxxx, >> boris.brezillon@xxxxxxxxxxx, linux-renesas-soc@xxxxxxxxxxxxxxx, >> "Geert Uytterhoeven" <geert+renesas@xxxxxxxxx>, >> >> cc >> >> juliensu@xxxxxxxxxxx, "Simon Horman" <horms@xxxxxxxxxxxx>, >> zhengxunli@xxxxxxxxxxx >> >> Subject >> >> Re: [PATCH v2 2/2] dt-binding: spi: Document Renesas R-Car Gen3 RPC >> controller bindings >> >> On 12/03/2018 10:18 AM, Mason Yang wrote: >> > Document the bindings used by the Renesas R-Car Gen3 RPC SPI controller. >> >> RPC is SPI and HF controller, it is not a pure SPI controller. >> >> How does this deal with the HF part ? Keep in mind the bindings are ABI >> and it will be difficult to redo them later. > > After checking HF datasheet, > 512_MBIT_256_MBIT_128_MBIT_HYPERFLASH_FAMILY_Datasheet.pdf. > > > > From my point of view, > HyperFlash is a kind of standard NOR Flash with high-speed SPI interface. > But I might be wrong. It behaves as a Parallel CFI NOR internally, and so it fits and works with the CFI NOR drivers (see the U-Boot driver), except the interface between the HF controller and the chip is custom. It's not SPI per-se. -- Best regards, Marek Vasut
