Commit 4c40db99 authored Mar 07, 2018 by Xiaofei Tan Committed by Martin K. Petersen Mar 12, 2018

scsi: hisi_sas: dt-bindings: add an property of signal attenuation



For some new boards with hip07 chipset we are required to set PHY config
registers differently. The hw property which determines how to set these
registers is in the PHY signal attenuation readings.

This patch add an devicetree property, "hisilicon,signal-attenuation", which
is used to describe the signal attenuation of an board.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

parent 1875ede0

Documentation/devicetree/bindings/scsi/hisilicon-sas.txt

+7 −0

Original line number	Diff line number	Diff line
		@@ -53,6 +53,13 @@ Main node required properties:
		Optional main node properties:
		- hip06-sas-v2-quirk-amt : when set, indicates that the v2 controller has the
		"am-max-transmissions" limitation.
		- hisilicon,signal-attenuation : array of 3 32-bit values, containing de-emphasis,
		preshoot, and boost attenuation readings for the board. They
		are used to describe the signal attenuation of the board. These
		values' range is 7600 to 12400, and used to represent -24dB to
		24dB.
		The formula is "y = (x-10000)/10000". For example, 10478
		means 4.78dB.

		Example:
		sas0: sas@c1000000 {

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