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

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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>
This commit is contained in:
Xiaofei Tan 2018-03-07 20:25:05 +08:00 committed by Martin K. Petersen
parent 1875ede02e
commit 4c40db995e
1 changed files with 7 additions and 0 deletions
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Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
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@ -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 {