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SubjectRe: [patch] split MMC_CAP_4_BIT_DATA
On Tue, 8 Jan 2008 13:29:39 -0500
Mike Frysinger <> wrote:

> The on-chip Blackfin MMC/SD/SDIO host controller has the ability to do 1-bit
> MMC, 1-bit/4-bit SD, and 1-bit/4-bit SDIO. Thus the current convention of
> MMC_CAP_4_BIT_DATA meaning "your host controller can do 1-bit or 4-bit for all
> modes" is insufficient for our needs. The attached patch splits
> updates all host controllers to include these in their caps and then changes
> existing code to check the new defines. At the moment, SD/SDIO are lumped
> into MMC_CAP_SD_4_BIT_DATA ... should I bother with splitting that into SD and
> SDIO as well while I'm doing this ?
> Signed-off-by: Mike Frysinger <>

I fail to see why you need to split MMC and SD. Could you elaborate why the controller won't work with MMC cards? I haven't seen any differences from SD.

-- Pierre Ossman

Linux kernel, MMC maintainer
PulseAudio, core developer
rdesktop, core developer

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