On 21 August 2012 16:31, Arnd Bergmann [off-list ref] wrote:

On Tuesday 21 August 2012, Thomas Abraham wrote:

quoted

diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt

b/Documentation/devicetree/bindings/mmc/mmc.txt
index 8a6811f..1aa527a 100644

--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt

@@ -16,6 +16,8 @@ Optional properties:
 - wp-inverted: when present, polarity on the wp gpio line is inverted
 - non-removable: non-removable slot (like eMMC)
 - max-frequency: maximum operating clock frequency
+- broken-cd: when present, indicates that the cd-gpios line is not
+       connected to the card-detect pad of the MMC host controller.

What is the difference between listing the cd line as broken and
listing no cd line at all?

I am trying to have a way to represent a gpio line as card detect line
that is not connected to the card-detect pad of the mmc controller but
instead used as a gpio interrupt line or polled gpio line.

'broken-cd' would imply that the card-detect pad of the mmc controller
is not connected to the card-detect pin at the slot. The 'cd-gpios'
property in that case would let the driver code to use the 'cd-gpios'
line as the external gpio interrupt or poll it.

Thanks,
Thomas.

        Arnd
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