On Thu, Oct 19, 2017 at 4:18 PM, <icenowy@xxxxxxx> wrote: > 在 2017-10-19 14:48，Chen-Yu Tsai 写道： >> >> On Wed, Oct 18, 2017 at 11:00 PM, Joonas Kylmälä <joonas.kylmala@xxxxxx> >> wrote: >>> >>> Hi, >>> >>> Chen-Yu Tsai: >>>> >>>> mmc1 only has 1 possible pinmux setting. >>> >>> >>> What if someone is using the MMC with bus width 1 and then using the >>> remaining 3 pins for something else? >> >> >> I would very much like to see such a design. Currently the devices >> we see all follow Allwinner's reference design, with only minor >> modifications. As such, mmc1 is used exclusively for connecting >> SDIO-based WiFi modules. >> >> If such a radical(?) design is done, the vendor can always add >> a "mmc1-1bit-pins" setting and override the default. > > > I think this kind of thing happened on A13 -- the MMC2 of A13 is > 8-bit, but Lichee Pi One wires it to a SD card slot (4-bit); then > the remaining 4 data lines are wired out as GPIO. (Lichee Pi's > do not like obeying reference design ;-) ) For MMC2 we have mmc2_pins (4-bit) and mmc2_8bit_emmc_pins (8-bit + emmc reset pin). ChenYu > > But I think a MMC/SDIO device under 1-bit mode is too slow that > maybe no one will use such a setup. > >> >> ChenYu > > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to linux-sunxi+unsubscribe@xxxxxxxxxxxxxxxx. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
