On 06/20/2017 11:45 AM, Linus Walleij wrote: >> IMHO mmc-util is where the patch really stands: the enabling is OTP, >> the programmer have to use mmc-util only once and the kernel >> will behave accordingly. > > So we should not add it to the device tree. > >> Any platform vendor must check that the HW Reset pin is actually >> Connected BEFORE enabling this feature otherwise the system may be >> unstable. A DT Binding may be dangerous if this condition is not met >> as well as the code execution at each MMC init is honestly redundant >> for an OTP location of the extCSD. > > I agree. So the device should be configured during production, or > a user who know exactly what they are doing may reconfigure it > using the mmc-utils. > > Thus the kernel should just read what the device says and stay with > that, no DT props or anything. Ok. Thanks for that clarification to everybody involved! Should we then add a warning/info message to the kernel if we have a reset gpio configured in the DT, but the eMMC hasn't this OTP bit set? Or should we just leave it as it is? (Due to the fact the reset-gpio could be connected to an external reset chip?) kind regards, Richard.L -- 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
