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sdhci: Add support for hosts that are only capable of 1-bit transfers

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Some hosts (hardware configurations, or particular SD/MMC slots) may
not support 4-bit bus. For example, on MPC8569E-MDS boards we can
switch between serial (1-bit only) and nibble (4-bit) modes, thought
we have to disable more peripherals to work in 4-bit mode.

Along with some small core changes, this patch modifies sdhci-of
driver, so that now it looks for "sdhci,1-bit-only" property in the
device-tree, and if specified we enable a proper quirk.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
This commit is contained in:
Anton Vorontsov
2009-06-18 00:14:08 +04:00
committed by Pierre Ossman
parent 04ac2f46d6
commit 5fe23c7f51
4 changed files with 11 additions and 1 deletions
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5
drivers/mmc/host/sdhci.c
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@@ -1761,7 +1761,10 @@ int sdhci_add_host(struct sdhci_host *host)
mmc->ops = &sdhci_ops;
mmc->f_min = host->max_clk / 256;
mmc->f_max = host->max_clk;
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
mmc->caps = MMC_CAP_SDIO_IRQ;
if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
mmc->caps |= MMC_CAP_4_BIT_DATA;
if (caps & SDHCI_CAN_DO_HISPD)
mmc->caps |= MMC_CAP_SD_HIGHSPEED;