On Sun, Nov 11, 2012 at 2:32 AM, Rob Herring <robherring2@xxxxxxxxx> wrote: > On 11/09/2012 06:48 PM, Stepan Moskovchenko wrote: >> Use the cell-index property to construct names for platform >> devices, falling back on the existing scheme of using the >> device register address if cell-index is not specified. >> >> The cell-index property is a more useful device identifier, >> especially in systems containing several numbered instances >> of a particular hardware block, since it more easily >> illustrates how devices relate to each other. >> >> Additionally, userspace software may rely on the classic >> <name>.<id> naming scheme to access device attributes in >> sysfs, without having to know the physical addresses of >> that device on every platform the userspace software may >> support. Using cell-index for device naming allows the >> device addresses to be hidden from userspace and to be >> exposed by logical device number without having to rely on >> auxdata to perform name overrides. This allows userspace to >> make assumptions about which sysfs nodes map to which >> logical instance of a specific hardware block. >> >> Signed-off-by: Stepan Moskovchenko <stepanm@xxxxxxxxxxxxxx> >> --- >> I had also considered using something like the linux,label property to allow >> custom names for platform devices without resorting to auxdata, but the >> cell-index approach seems more in line with what cell-index was intended for >> and with what the pre-DT platform device naming scheme used to be. Please let >> me know if you think there is a better way to accomplish this. >> >> This is just being sent out as an RFC for now. If there are no objections, I >> will send this out as an official patch, along with (or combined with) a patch >> to fix up the device names in things like clock tables of any affected >> platforms. > > cell-index is basically deprecated. This has been discussed multiple > times in the past. You can use auxdata if you really need to have the > old name. Actually, I think it would be fine to use an /aliases entry to set the device name. That's the place to put global namespace information. g. -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
