linux-kernel - Re: [PATCH v3 08/11] devicetree: bindings: pci: document PARF params bindings

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Date:   Thu, 7 May 2020 13:10:44 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/11] devicetree: bindings: pci: document PARF params
 bindings

On Fri, May 01, 2020 at 12:06:15AM +0200, Ansuel Smith wrote:
> It is now supported the editing of Tx De-Emphasis, Tx Swing and
> Rx equalization params on ipq8064. Document this new optional params.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  .../devicetree/bindings/pci/qcom,pcie.txt     | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> index 6efcef040741..8cc5aea8a1da 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> @@ -254,6 +254,42 @@
>  			- "perst-gpios"	PCIe endpoint reset signal line
>  			- "wake-gpios"	PCIe endpoint wake signal line
>  
> +- qcom,tx-deemph-gen1:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: Gen1 De-emphasis value.
> +		    For ipq806x should be set to 24.

Unless these need to be tuned per board, then the compatible string for 
ipq806x should imply all these settings.

> +
> +- qcom,tx-deemph-gen2-3p5db:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: Gen2 (3.5db) De-emphasis value.
> +		    For ipq806x should be set to 24.
> +
> +- qcom,tx-deemph-gen2-6db:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: Gen2 (6db) De-emphasis value.
> +		    For ipq806x should be set to 34.
> +
> +- qcom,tx-swing-full:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: TX launch amplitude swing_full value.
> +		    For ipq806x should be set to 120.
> +
> +- qcom,tx-swing-low:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: TX launch amplitude swing_low value.
> +		    For ipq806x should be set to 120.
> +
> +- qcom,rx0-eq:
> +	Usage: optional (available for ipq/apq8064)
> +	Value type: <u32>
> +	Definition: RX0 equalization value.
> +		    For ipq806x should be set to 4.
> +
>  * Example for ipq/apq8064
>  	pcie@...00000 {
>  		compatible = "qcom,pcie-apq8064", "qcom,pcie-ipq8064", "snps,dw-pcie";
> -- 
> 2.25.1
>