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SubjectRe: [PATCH 1/8] dt-bindings: scsi: hisi_sas: add an property of signal attenuation
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On 01/03/2018 21:40, Rob Herring wrote:
> On Tue, Feb 20, 2018 at 03:13:24AM +0800, John Garry wrote:
>> From: Xiaofei Tan <tanxiaofei@huawei.com>
>>
>> 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, 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>
>> ---
>> Documentation/devicetree/bindings/scsi/hisilicon-sas.txt | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
>> index df3bef7..bd32ecd 100644
>> --- a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
>> +++ b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
>> @@ -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.
>> + - signal-attenuation : array of 3 32-bit values, containing de-emphasis,
>
> Needs a vendor prefix.

Fine, I can add it. It's going to be "hisilicon-signal-attenuation" or
similar.

Thanks,
John

>
>> + 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 {
>> --
>> 1.9.1
>>
>
> .
>


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