On 05.10.2015 22:18, Pavel Fedin wrote: > Hello! > >> That is interesting. What do you mean by that? Although SROM controller >> can access external memory (SRAM, ROM) but it is not exactly a bus. How >> is the SMSC9111 "connected"? What interface or protocol is used? > > SROM controller actually provides a demultiplexed external address and data bus. This way you could > hook up old good ROM chip to it (hence its name). However, you can plug in there anything else with > the appropriate interface, and SMSC9111 uses exactly that. Just some address + control + data wires. > Therefore, you can think of SROMc as a simple bus. Ah, okay, thanks for details. > >> I am sorry but I cannot figure out what exactly are you talking about. >> The Device Tree is the glue to describe the board, the hardware and its >> configuration. Please elaborate a little more. > > Yes, exactly that. SROM controller has 4 outputs, and for every of these outputs you have to choose > mode and timings. Once you set them correctly, you can use peripherial behind them. These timings > actually depend on the actual peripherial. > > By this time i remembered that u-boot guys also did something with this. And here are links: > http://git.denx.de/?p=u-boot.git;a=blob;f=arch/arm/dts/exynos5250-smdk5250.dts;h=8b695442b1a29dec4e3 > 53ebd3cfee0ff89f218a6;hb=HEAD#l43 - this is how connection is described > http://git.denx.de/?p=u-boot.git;a=blob;f=board/samsung/common/board.c;h=d32c75de50858f131284e28db0c > 7ed55883f1cb0;hb=HEAD#l184 - and this is parsing code I see... Pankaj's driver was not developed for that purpose. You would have to extend it. For the SROMC driver there shouldn't be much work to do: just parse additional bindings and configure the controller for ethernet adapter. > There's only one small problem with their code. "bank" parameter is device-wide, therefore you > cannot configure more than one bank. For SMDK boards it's OK, but in future you may run into problem > with this. You are not bound by u-boot bindings anyhow (at least to my understanding). You can try to re-use them but if some binding is problematic then just create your own. Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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