[PATCH] mmc: sdhci-iproc: Enable eMMC DDR 3.3V support for bcm2711

[Ulf Hansson]

On Fri, 28 Aug 2020 at 23:48, Stefan Wahren <stefan.wahren at i2se.com> wrote:
>
> The emmc2 interface on the bcm2711 supports DDR modes for eMMC devices
> running at 3.3V. This allows to run eMMC module with 3.3V signaling voltage
> at DDR52 mode on the Raspberry Pi 4 using a SD adapter:
>
>   clock: 52000000 Hz
>   actual clock: 50000000 Hz
>   vdd: 21 (3.3 ~ 3.4 V)
>   bus mode: 2 (push-pull)
>   chip select: 0 (don't care)
>   power mode: 2 (on)
>   bus width: 2 (4 bits)
>   timing spec: 8 (mmc DDR52)
>   signal voltage: 0 (3.30 V)
>   driver type: 0 (driver type B)
>
> Link: https://github.com/raspberrypi/linux/issues/3802
> Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-iproc.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
> index e2d8dfe..b540aa6 100644
> --- a/drivers/mmc/host/sdhci-iproc.c
> +++ b/drivers/mmc/host/sdhci-iproc.c
> @@ -283,6 +283,7 @@ static const struct sdhci_pltfm_data sdhci_bcm2711_pltfm_data = {
>
>  static const struct sdhci_iproc_data bcm2711_data = {
>         .pdata = &sdhci_bcm2711_pltfm_data,
> +       .mmc_caps = MMC_CAP_3_3V_DDR,
>  };
>
>  static const struct of_device_id sdhci_iproc_of_match[] = {
> --
> 2.7.4
>