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From patchwork Fri Aug 28 21:47:14 2020
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X-Patchwork-Submitter: Stefan Wahren <stefan.wahren@i2se.com>
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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Adrian Hunter <adrian.hunter@intel.com>,
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Stefan Wahren <stefan.wahren@i2se.com>
Subject: [PATCH] mmc: sdhci-iproc: Enable eMMC DDR 3.3V support for bcm2711
Date: Fri, 28 Aug 2020 23:47:14 +0200
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Sender: linux-mmc-owner@vger.kernel.org
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List-ID: <linux-mmc.vger.kernel.org>
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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(+)
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[] = {
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