linux-kernel - Re: [PATCH 11/12] devicetree: bindings: pci: add force

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Message-ID: <20200331173348.GA28253@bogus>
Date:   Tue, 31 Mar 2020 11:33:48 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Stanimir Varbanov <svarbanov@...sol.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....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 11/12] devicetree: bindings: pci: add force_gen1 for
 qcom,pcie

On Fri, Mar 20, 2020 at 07:34:53PM +0100, Ansuel Smith wrote:
> Document force_gen1 optional definition to limit pcie
> line to GEN1 speed
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> index 8c1d014f37b0..766876465c42 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> @@ -260,6 +260,11 @@
>  	Definition: If not defined is 0. In ipq806x is set to 7. In newer
>  				revision (v2.0) the offset is zero.
>  
> +- force_gen1:
> +	Usage: optional
> +	Value type: <u32>
> +	Definition: Set 1 to force the pcie line to GEN1
> +

I believe we have a standard property 'link-speed' for this purpose.

>  * Example for ipq/apq8064
>  	pcie@...00000 {
>  		compatible = "qcom,pcie-apq8064", "qcom,pcie-ipq8064", "snps,dw-pcie";
> -- 
> 2.25.1
>