linux-kernel - Re: [PATCH v2 1/8] dt-bindings: scsi: hisi_sas: add an property of signal attenuation

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Date:   Fri, 2 Mar 2018 09:57:20 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-scsi@...r.kernel.org, devicetree@...r.kernel.org,
        Linuxarm <linuxarm@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Xiaofei Tan <tanxiaofei@...wei.com>
Subject: Re: [PATCH v2 1/8] dt-bindings: scsi: hisi_sas: add an property of
 signal attenuation

On Fri, Mar 2, 2018 at 9:06 AM, John Garry <john.garry@...wei.com> wrote:
> 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, hisi-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..6f6876a 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.
> + - hisi-signal-attenuation : array of 3 32-bit values, containing de-emphasis,

The format for vendor prefixes is: <vendor prefix>,property-name

And should only be ones defined in vendor-prefixes.txt

> +               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 {
> --
> 1.9.1
>