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From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Cc: Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konradybcio@kernel.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: glymur: Drop fake PCIe phy 3B
Date: Thu, 23 Apr 2026 09:16:50 +0200	[thread overview]
Message-ID: <5c1f7955-883f-4fa8-a0e5-513a987bd3a9@oss.qualcomm.com> (raw)
In-Reply-To: <dttcqv63qc6igab7zxlg27ckt3irmjnzhjgcvq6oz7ays4q2ld@be5kp4i433f4>

On 22/04/2026 22:08, Dmitry Baryshkov wrote:
> On Tue, Apr 21, 2026 at 08:41:14AM +0200, Krzysztof Kozlowski wrote:
>> On 20/04/2026 20:02, Dmitry Baryshkov wrote:
>>> On Mon, Apr 20, 2026 at 03:36:17PM +0200, Krzysztof Kozlowski wrote:
>>>> According to user manual / programming guide there is no separate PCIe
>>>> phy 3A and 3B, but one 8-lane QMP PCIe Gen5 PHY which consists of two
>>>> 4-lane blocks.  This is also visible in memory map, where the 0xf00000
>>>> is marked as the main block with additional sub blocks for each 4-lane
>>>> phys.
>>>>
>>>> Describing the sub phys without the rest is not correct from hardware
>>>> description, even if it works.
>>>
>>> Is this the case for the other bifurcated PHYs?
>>>
>>
>> There's more? Oh damn...
> 
> In the previous generations. I think Hamoa had one.

Ah, I did not check the others and there is little we can do there -
it's released DTS. This cannot be easily changed while keeping DTS
compatible with users, because probably two PHY nodes will be replaced
by one with different compatible.

Therefore I want to change only the platforms freshly added, where any
incompatibility impact will be minimal.

Best regards,
Krzysztof

  reply	other threads:[~2026-04-23  7:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-20 13:36 [PATCH] arm64: dts: qcom: glymur: Drop fake PCIe phy 3B Krzysztof Kozlowski
2026-04-20 18:02 ` Dmitry Baryshkov
2026-04-21  6:41   ` Krzysztof Kozlowski
2026-04-22 20:08     ` Dmitry Baryshkov
2026-04-23  7:16       ` Krzysztof Kozlowski [this message]
2026-04-24 11:09         ` Konrad Dybcio

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