linux-kernel - Re: [PATCH] schemas: pci: Document PCIe T_POWER

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Message-ID: <96c49d08-10dd-4a82-a6ec-345701b771d6@oss.qualcomm.com>
Date: Thu, 6 Nov 2025 19:37:32 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: andersson@...nel.org, robh@...nel.org, manivannan.sadhasivam@...aro.org,
        krzk@...nel.org, helgaas@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, lpieralisi@...nel.org, kw@...ux.com,
        conor+dt@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree-spec@...r.kernel.org,
        quic_vbadigan@...cinc.com
Subject: Re: [PATCH] schemas: pci: Document PCIe T_POWER_ON


On 11/6/2025 6:08 PM, Manivannan Sadhasivam wrote:
> On Thu, Nov 06, 2025 at 05:09:51PM +0530, Krishna Chaitanya Chundru wrote:
>>  From PCIe r6, sec 5.5.4 & sec 5.5.5 T POWER_ON is the minimum amount
> T_POWER_ON
>
> You should provide reference to the Table 5-11, where T_POWER_ON is described
Actually 5.5.5 section has only table 5-11 which describes this, I will 
add the Table 5-11
reference also in next patch.
>> of time
> "(in us)"
>
>> that each component must wait in L1.2.Exit after sampling CLKREQ#
>> asserted before actively driving the interface to ensure no device is ever
>> actively driving into an unpowered component and these values are based on
>> the components and AC coupling capacitors used in the connection linking
>> the two components.
>>
>> Certain controllers may need to program this before enumeration, such
>> controllers can use this property to program it.
>>
> I'd remove this statement and just mention that this property should be used to
> indicate the T_POWER_ON for each Root Port.
ack.

- Krishna Chaitanya.
> - Mani
>