linux-kernel - Re: [PATCH v2 3/4] dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'

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Date:   Fri, 1 May 2020 10:48:02 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] dt-bindings: PCI: brcmstb: New prop 'aspm-no-l0s'

On Fri, May 1, 2020 at 9:29 AM Jim Quinlan <james.quinlan@...adcom.com> wrote:
>
> From: Jim Quinlan <jquinlan@...adcom.com>
>
> For various reasons, one may want to disable the ASPM L0s
> capability.
>
> Signed-off-by: Jim Quinlan <jquinlan@...adcom.com>
> ---
>  Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> index 77d3e81a437b..084e4cf68b95 100644
> --- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> @@ -56,6 +56,10 @@ properties:
>      description: Indicates usage of spread-spectrum clocking.
>      type: boolean
>
> +  aspm-no-l0s:
> +    description: Disables ASPM L0s capability.
> +    type: boolean

Copied from rockchip-pcie-host.txt? Let's make this a standard
property. It should be documented here[1].

Then this doc just needs 'aspm-no-l0s: true' to indicate you are using it.

Rob

[1] https://github.com/devicetree-org/dt-schema/blob/master/schemas/pci/pci-bus.yaml