Commit ae0c12cc authored Sep 16, 2016 by Zach Brown Committed by Ulf Hansson Sep 26, 2016

dt: sdhci-of-arasan: Add device tree option xlnx, fails-without-test-cd

The sdhci controller on xilinx zynq devices will not function unless
the CD bit is provided. http://www.xilinx.com/support/answers/61064.html


In cases where it is impossible to provide the CD bit in hardware,
setting the controller to test mode and then setting inserted to true
will get the controller to function without the CD bit.

The device property "xlnx,fails-without-test-cd" will let the arasan
driver know the controller does not have the CD line wired and that the
controller does not function without it.

Signed-off-by: Zach Brown <zach.brown@ni.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 0bc0b6e8

Documentation/devicetree/bindings/mmc/arasan,sdhci.txt

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -36,6 +36,9 @@ Optional Properties:
	- #clock-cells: If specified this should be the value <0>. With this property		- #clock-cells: If specified this should be the value <0>. With this property
	in place we will export a clock representing the Card Clock. This clock		in place we will export a clock representing the Card Clock. This clock
	is expected to be consumed by our PHY. You must also specify		is expected to be consumed by our PHY. You must also specify
			- 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.

	Example:		Example:
	sdhci@e0100000 {		sdhci@e0100000 {