On 12 January 2015 at 15:26, Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> wrote: > On 2 January 2015 at 17:14, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: >> This is yet another try to solve the issues of dealing with power sequences for >> the MMC subsystem. The latest attempt, see link below, took a generic approach >> by adding a new top level driver layer. That's was rejected by several reasons. >> http://lwn.net/Articles/602855/ >> >> This time the approach is focused to fix the issues for MMC only. >> >> To give a short background, SOCs may specify a specific MMC power sequence. To >> successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed >> while initializing the card. > > Hi Ulf, > > have used this to successfully init a mwifiex_sdio card but had to > also add a delay while the reset line is asserted. May make sense to > add a property to the pwrseq node to specify the minimum amount of > time that the reset GPIO needs to be asserted? To me that is description of the HW, so I would happily accept such a DT property. Can you please send a patch, based on top of this patchset? BTW, I guess you only need the delay while the ->power_up() callback is invoked and not for ->power_off()? > > Tested-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> Thanks for helping out testing! Kind regards Uffe -- 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
