linux-kernel - Re: [PATCH 1/8] dt-bindings: scsi: hisi_sas: add an property of signal attenuation

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Date:   Thu, 22 Feb 2018 20:49:17 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     <robh+dt@...nel.org>, <mark.rutland@....com>
Cc:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        Xiaofei Tan <tanxiaofei@...wei.com>
Subject: Re: [PATCH 1/8] dt-bindings: scsi: hisi_sas: add an property of signal attenuation


> From: Xiaofei Tan <tanxiaofei@...wei.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@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
> Signed-off-by: John Garry <john.garry@...wei.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,
> +		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@...00000 {

Rob/Mark: Please review!

-- 
Martin K. Petersen	Oracle Linux Engineering