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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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X-Patchwork-Id: 11743769
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for <patchwork-linux-mmc@patchwork.kernel.org>;
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Fri, 28 Aug 2020 21:48:59 +0000 (UTC)
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for <patchwork-linux-mmc@patchwork.kernel.org>;
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Fri, 28 Aug 2020 21:48:59 +0000 (UTC)
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id 1MzQTm-1kXpKC3Jq4-00vObT; Fri, 28 Aug 2020 23:48:40 +0200
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From: Stefan Wahren <stefan.wahren@i2se.com>
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To: Adrian Hunter <adrian.hunter@intel.com>,
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Ulf Hansson <ulf.hansson@linaro.org>,
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Ray Jui <rjui@broadcom.com>,
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Scott Branden <sbranden@broadcom.com>
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Cc: Florian Fainelli <f.fainelli@gmail.com>,
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Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
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Matthias Brugger <mbrugger@suse.com>,
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bcm-kernel-feedback-list@broadcom.com, linux-mmc@vger.kernel.org,
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linux-arm-kernel@lists.infradead.org,
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Stefan Wahren <stefan.wahren@i2se.com>
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Subject: [PATCH] mmc: sdhci-iproc: Enable eMMC DDR 3.3V support for bcm2711
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Date: Fri, 28 Aug 2020 23:47:14 +0200
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Sender: linux-mmc-owner@vger.kernel.org
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Precedence: bulk
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List-ID: <linux-mmc.vger.kernel.org>
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X-Mailing-List: linux-mmc@vger.kernel.org
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The emmc2 interface on the bcm2711 supports DDR modes for eMMC devices
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running at 3.3V. This allows to run eMMC module with 3.3V signaling voltage
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at DDR52 mode on the Raspberry Pi 4 using a SD adapter:
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clock: 52000000 Hz
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actual clock: 50000000 Hz
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vdd: 21 (3.3 ~ 3.4 V)
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bus mode: 2 (push-pull)
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chip select: 0 (don't care)
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power mode: 2 (on)
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bus width: 2 (4 bits)
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timing spec: 8 (mmc DDR52)
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signal voltage: 0 (3.30 V)
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driver type: 0 (driver type B)
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Link: https://github.com/raspberrypi/linux/issues/3802
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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---
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drivers/mmc/host/sdhci-iproc.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
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index e2d8dfe..b540aa6 100644
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--- a/drivers/mmc/host/sdhci-iproc.c
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+++ b/drivers/mmc/host/sdhci-iproc.c
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@@ -283,6 +283,7 @@ static const struct sdhci_pltfm_data sdhci_bcm2711_pltfm_data = {
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static const struct sdhci_iproc_data bcm2711_data = {
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.pdata = &sdhci_bcm2711_pltfm_data,
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+ .mmc_caps = MMC_CAP_3_3V_DDR,
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};
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static const struct of_device_id sdhci_iproc_of_match[] = {
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