On Wed, Jan 25, 2017 at 04:12:17PM +0100, Ulf Hansson wrote: > It's been reported that some mmc hosts don't support a VCCQ (signal voltage) of > 1.8V for eMMC DDR mode, but instead only 3.3V. According to the JEDEC spec, an > eMMC card must support both if any, which makes the mmc host being the > potential limitation. Therefore, let's invent a new mmc cap, MMC_CAP_3_3V_DDR, > and a new corresponding DT binding, which tells whether 3.3V is supported for > the VCCQ. > > In the context of these changes, I took the opportunity to make some clean-ups > of some related code. Works fine with the new Cavium driver (enables DDR mode for the eMMC). Tested-by: Jan Glauber <jglauber@xxxxxxxxxx> > Ulf Hansson (6): > mmc: core: Remove redundant code in mmc_set_signal_voltage() > mmc: core: Clarify usage of mmc_set_signal_voltage() > mmc: core: Rename __mmc_set_signal_voltage() to > mmc_set_signal_voltage() > mmc: core: Invent MMC_CAP_3_3V_DDR > mmc: dt: Document binding for eMMC DDR 3.3V I/O voltage support > mmc: core: Extend mmc_of_parse() to check for mmc-ddr-3_3v > > Documentation/devicetree/bindings/mmc/mmc.txt | 1 + > drivers/mmc/core/core.c | 19 ++++++------------- > drivers/mmc/core/core.h | 4 ++-- > drivers/mmc/core/host.c | 2 ++ > drivers/mmc/core/mmc.c | 27 +++++++++++++++------------ > drivers/mmc/core/sd.c | 3 +-- > drivers/mmc/core/sdio.c | 3 +-- > include/linux/mmc/host.h | 21 ++++++++++----------- > 8 files changed, 38 insertions(+), 42 deletions(-) > > -- > 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
