linux-kernel - Re: [PATCH v4 0/5] PCI: Add initial support for handling PCIe M.2 connectors in devicetree

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Message-ID: <jhykqitumvq6jr63euamjdli4zntxbxasepx3g5nn4m45fu4ou@m2v44lk7lbby>
Date: Tue, 30 Dec 2025 15:29:32 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Niklas Cassel <cassel@...nel.org>, Rob Herring <robh@...nel.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Damien Le Moal <dlemoal@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...nel.org>, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	Stephan Gerhold <stephan.gerhold@...aro.org>, Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	linux-pm@...r.kernel.org, linux-ide@...r.kernel.org, Frank Li <Frank.Li@....com>, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 0/5] PCI: Add initial support for handling PCIe M.2
 connectors in devicetree

On Tue, Dec 30, 2025 at 10:33:52AM +0100, Niklas Cassel wrote:
> Hello Mani,
> 
> On Sun, Dec 28, 2025 at 10:31:00PM +0530, Manivannan Sadhasivam wrote:
> > The Mechanical Key M connector is used to connect SSDs to the host machine over
> > PCIe/SATA interfaces. Due to the hardware constraints, this series only adds
> > support for driving the PCIe interface of the connector in the kernel.
> 
> Since this series does not add any support for SATA, do we really want to
> modify the SATA device tree binding?
> 
> I know that device tree describes the hardware, but if there is no software
> that makes use of this, the SATA DT binding change feels a bit unnecessary.
> 
> Do we perhaps want to defer modifying the SATA DT binding change until the
> corresponding change in software is added?
> 

I'll defer the question to Rob since he was the one who asked for the SATA
binding change:

https://lore.kernel.org/all/20251208191110.GA2473021-robh@kernel.org

- Mani

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