Hi Lee, Linus, Thanks for your comments! 2017-05-22 17:43 GMT+09:00 Linus Walleij <linus.walleij@xxxxxxxxxx>: > On Mon, May 22, 2017 at 3:29 AM, Masahiro Yamada > <yamada.masahiro@xxxxxxxxxxxxx> wrote: > >> Because "simple-bus" indicates that child nodes are >> simply memory mapped, but the node "register-bit-led" >> can not be memory-mapped. >> So, "simple-mfd" can not be replaced "simple-bus" here. > > Yeah... just like Lee points out, you are spot on, this is exactly > the reason why we created "simple-mfd" in the first place > IIRC. OK, Linux treats simple-bus and simple-mfd in the same way as far as I see drivers/of/platform.c Perhaps, can we document the difference between simple-bus and simple-mfd clearly? For example, "Unlike simple-bus, it is legitimate that simple-mfd has subnodes without reg property" I think this is typical when "simple-mfd" is used together with "syscon". The child devices will use regmap of the parent node. I'd like to be sure this is valid usage. -- Best Regards Masahiro Yamada -- 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
