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

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Florian Fainelli <f.fainelli@gmail.com>,
	Jim Quinlan <jim2101024@gmail.com>,
	Stefan Wahren <stefan.wahren@i2se.com>
Cc: linux-pci@vger.kernel.org,
	"Nicolas Saenz Julienne" <nsaenz@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Cyril Brulebois" <kibi@debian.org>,
	"Phil Elwell" <phil@raspberrypi.com>,
	bcm-kernel-feedback-list@broadcom.com,
	james.quinlan@broadcom.com,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
	<linux-rpi-kernel@lists.infradead.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 1/3] dt-bindings: PCI: brcmstb: Add two optional props
Date: Thu, 6 Apr 2023 20:53:46 +0200	[thread overview]
Message-ID: <d7b965cf-dc83-47dd-5e84-2796229fdfb9@linaro.org> (raw)
In-Reply-To: <5c6d0259-0fe2-4faa-5ecf-8621467533a1@gmail.com>

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