Hi Dong, On Fri, Jun 12, 2015 at 12:22 AM, Dong Aisheng <b29396@xxxxxxxxxxxxx> wrote: > I think this patch will break the eMMC DDR 3.3v mode support. I don't think so. This patch only changes the behaviour when 'no-1-8-v' property is used. This custom board has an eMMC that can operate at 1.8V, but the board itself can only provide 3.3V. In this case we need to pass 'no-1-8-v' as explained in Documentation/devicetree/bindings/mmc/mmc.txt: "- no-1-8-v: when present, denotes that 1.8v card voltage is not supported on this system, even if the controller claims it is." Then in this case we should not set MMC_CAP_1_8V_DDR, which will make the card to work at 3.3V. Regards, Fabio Estevam -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
