diff mbox series

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

Message ID 1598651234-29826-1-git-send-email-stefan.wahren@i2se.com (mailing list archive)
State New, archived
Headers show
Series mmc: sdhci-iproc: Enable eMMC DDR 3.3V support for bcm2711 | expand

Commit Message

Stefan Wahren Aug. 28, 2020, 9:47 p.m. UTC
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@i2se.com>
---
 drivers/mmc/host/sdhci-iproc.c | 1 +
 1 file changed, 1 insertion(+)

Comments

Ulf Hansson Sept. 2, 2020, 9:03 a.m. UTC | #1
On Fri, 28 Aug 2020 at 23:48, Stefan Wahren <stefan.wahren@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@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
>
diff mbox series

Patch

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[] = {