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dt-bindings: mmc: broken clock stable indicator on arasan controllers

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Some controllers immediately report that their internal clock is stable
after activating it even when the clock is not stable. When used in
conjunction with older/slower cards, this can result in:

    mmc0: error -84 whilst initialising SD card

This flag allows documenting and thus working around such a hardware
defect.

Signed-off-by: Helmut Grohne <h.grohne@intenta.de>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Helmut Grohne 2018-06-20 13:32:51 +02:00 committed by Ulf Hansson
parent 5637ffadf6
commit 26c3122813
1 changed files with 2 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
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@ -39,6 +39,8 @@ Optional Properties:
- xlnx,fails-without-test-cd: when present, the controller doesn't work when
the CD line is not connected properly, and the line is not connected
properly. Test mode can be used to force the controller to function.
- xlnx,int-clock-stable-broken: when present, the controller always reports
that the internal clock is stable even when it is not.
Example:
sdhci@e0100000 {