Quoting Yixun Lan (2018-10-25 00:29:15)

yes, I think the documentation need to be fixed

for the final solution, we decide to make 'mmc-clkc' an independent node
instead of being a sub-node of 'mmc', so both of them may exist in parallel..

the DT part may like this:

                        sd_emmc_c_clkc: clock-controller at 7000 {
                                compatible = "amlogic,axg-mmc-clkc", "syscon";
                                reg = <0x0 0x7000 0x0 0x4>;
                                ...
                        };

                        sd_emmc_c: mmc at 7000 {
                                compatible = "amlogic,axg-mmc";
                                reg = <0x0 0x7000 0x0 0x800>;
                                ...
                        };

That's improper usage of DT. We don't want two devices at the same
register offset.