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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-06-17 20:14:08 (GMT) |
|---|---|---|
| committer | Pierre Ossman <pierre@ossman.eu> | 2009-06-21 19:00:59 (GMT) |
| commit | 5fe23c7f51def59f66bc6aeee988ef1a467a2c8c (patch) | |
| tree | 6d10aa3966cf105a8c6d6b758660fa6f00a49896 /Documentation/powerpc | |
| parent | 04ac2f46d6ecb995f78c9ae4e2e4707d00b5339f (diff) | |
| download | linux-5fe23c7f51def59f66bc6aeee988ef1a467a2c8c.tar.xz | |
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 <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Diffstat (limited to 'Documentation/powerpc')
| -rw-r--r-- | Documentation/powerpc/dts-bindings/fsl/esdhc.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/powerpc/dts-bindings/fsl/esdhc.txt b/Documentation/powerpc/dts-bindings/fsl/esdhc.txt index 5093ddf..3ed3797 100644 --- a/Documentation/powerpc/dts-bindings/fsl/esdhc.txt +++ b/Documentation/powerpc/dts-bindings/fsl/esdhc.txt @@ -10,6 +10,8 @@ Required properties: - interrupts : should contain eSDHC interrupt. - interrupt-parent : interrupt source phandle. - clock-frequency : specifies eSDHC base clock frequency. + - sdhci,1-bit-only : (optional) specifies that a controller can + only handle 1-bit data transfers. Example: |