linux-kernel - Re: [PATCH v1 1/3] dt-bindings: PCI: brcmstb: Add two optional props

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Date:   Thu, 6 Apr 2023 20:53:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Jim Quinlan <jim2101024@...il.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        Phil Elwell <phil@...pberrypi.com>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "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:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] dt-bindings: PCI: brcmstb: Add two optional props

On 06/04/2023 20:47, Florian Fainelli wrote:
>>>>> +
>>>>> +  brcm,completion-timeout-msecs:
>>>>> +    description: Number of msecs before completion timeout
>>>>> +      abort occurs.
>>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>>
>>>> According to the driver at least 0 is not allowed, maybe we should
>>>> define minimum and maximum here and let dtbs_check take care of invalid
>>>> values?
>>> I'm not sure I follow what you mean about a zero value;  the property
>>> may have any value but the driver will clamp it
>>> to a minimum of ~30msec.  Regardless, I can add a  "minimum: 30" line
>>> to the YAML.
>>
>> If "completion" means Linux completion, then it is not suitable for DT
>> and entire property should be removed. If it is something else, then
>> explain here and commit msg. So far both refer to some completion...
> 
> This is a PCIe root complex binding so completion needs to be understood 
> in the context of PCIe, that is the time needed for the root complex to 
> complete/finish/proceed with a PCIe transaction layer packet (TLP).

OK, so I assume keyword "completion" is well known term in PCI (although
for some reason no other bindings mention it).

Best regards,
Krzysztof