Commit 8d62fa83 authored Aug 28, 2020 by Stefan Wahren Committed by Ulf Hansson Sep 07, 2020

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

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>
Link: https://lore.kernel.org/r/1598651234-29826-1-git-send-email-stefan.wahren@i2se.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent e282f204

drivers/mmc/host/sdhci-iproc.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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[] = {

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