From 5fe23c7f51def59f66bc6aeee988ef1a467a2c8c Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Thu, 18 Jun 2009 00:14:08 +0400 Subject: sdhci: Add support for hosts that are only capable of 1-bit transfers 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 Acked-by: Grant Likely Signed-off-by: Pierre Ossman --- drivers/mmc/host/sdhci.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/mmc/host/sdhci.c') diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 3856669aa7e8..c7586739be1e 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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; -- cgit v1.2.2