Hi Marek, > Marek Vasut <marex@xxxxxxx> hat am 6. August 2016 um 15:14 geschrieben: > > > On 08/06/2016 02:55 PM, Stefan Wahren wrote: > > This patch based on the work of Fabio Estevam: > > "[PATCH v2] mmc: core: Do not set mmc voltage to 1.8V when > > 'no-1-8-v' is present" > > > > It adds the support for 3.3V only DDR MMC hosts. > > Do such cards even exist ? Do you have a link where I can find some ? i never said anything about SD cards. I mean eMMC modules which usually have 8 data pins like this one [1]. Please don't blame me if it's not compatible to i.MX28. It's only an example. [1] - http://datasheet.octopart.com/THGBM3G4D1FBAIGH2H-Toshiba-datasheet-20748880.pdf > > > Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx> > > --- > > drivers/mmc/core/host.c | 2 ++ > > drivers/mmc/core/mmc.c | 6 ++++++ > > include/linux/mmc/host.h | 1 + > > 3 files changed, 9 insertions(+) > > > > Changes to Fabio's patch: > > - rebase to current linux-next > > - rename DT property to mmc-ddr-3_3v > > - use EXT_CSD_CARD_TYPE_DDR_52 instead of new define > > > > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c > > index 98f25ff..4c971de 100644 > > --- a/drivers/mmc/core/host.c > > +++ b/drivers/mmc/core/host.c > > @@ -301,6 +301,8 @@ int mmc_of_parse(struct mmc_host *host) > > if (of_property_read_bool(np, "wakeup-source") || > > of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */ > > host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; > > + if (of_property_read_bool(np, "mmc-ddr-3_3v")) > > + host->caps2 |= MMC_CAP2_3_3V_ONLY_DDR; > > if (of_property_read_bool(np, "mmc-ddr-1_8v")) > > host->caps |= MMC_CAP_1_8V_DDR; > > if (of_property_read_bool(np, "mmc-ddr-1_2v")) > > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c > > index f2d185c..8a933d5 100644 > > --- a/drivers/mmc/core/mmc.c > > +++ b/drivers/mmc/core/mmc.c > > @@ -210,6 +210,12 @@ static void mmc_select_card_type(struct mmc_card *card) > > avail_type |= EXT_CSD_CARD_TYPE_HS_52; > > } > > > > + if (caps2 & MMC_CAP2_3_3V_ONLY_DDR && > > + card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) { > > + hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; > > + avail_type |= EXT_CSD_CARD_TYPE_DDR_52; > > + } > > + > > if (caps & MMC_CAP_1_8V_DDR && > > card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) { > > hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; > > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > > index aa4bfbf..db0775d 100644 > > --- a/include/linux/mmc/host.h > > +++ b/include/linux/mmc/host.h > > @@ -311,6 +311,7 @@ struct mmc_host { > > #define MMC_CAP2_HS400_ES (1 << 20) /* Host supports enhanced strobe */ > > #define MMC_CAP2_NO_SD (1 << 21) /* Do not send SD commands during > > initialization */ > > #define MMC_CAP2_NO_MMC (1 << 22) /* Do not send (e)MMC commands during > > initialization */ > > +#define MMC_CAP2_3_3V_ONLY_DDR (1 << 23) /* Only supports 3.3V DDR */ > > > > mmc_pm_flag_t pm_caps; /* supported pm features */ > > > > > > > -- > Best regards, > Marek Vasut -- 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
