path: root/Documentation/powerpc
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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-06-17 20:14:08 (GMT)
committerPierre Ossman <pierre@ossman.eu>2009-06-21 19:00:59 (GMT)
commit5fe23c7f51def59f66bc6aeee988ef1a467a2c8c (patch)
tree6d10aa3966cf105a8c6d6b758660fa6f00a49896 /Documentation/powerpc
parent04ac2f46d6ecb995f78c9ae4e2e4707d00b5339f (diff)
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')
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.

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