linux-kernel - Re: [PATCH 1/4] dt-bindings: connector: Add PCIe M.2 Mechanical Key M connector

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Message-ID: <g6me3bgstp7pooylyiexv3u3gg7c6v4bbxuukjsqw6avd77ki3@usokcdmyl7i6>
Date: Sat, 8 Nov 2025 08:51:43 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, 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>
Subject: Re: [PATCH 1/4] dt-bindings: connector: Add PCIe M.2 Mechanical Key
 M connector

On Thu, Nov 06, 2025 at 05:57:17PM +0000, Conor Dooley wrote:
> On Wed, Nov 05, 2025 at 02:45:49PM +0530, Manivannan Sadhasivam wrote:
> > Add the devicetree binding for PCIe M.2 Mechanical Key M connector. This
> > connector provides interfaces like PCIe and SATA to attach the Solid State
> > Drives (SSDs) to the host machine along with additional interfaces like
> > USB, and SMB for debugging and supplementary features. At any point of
> > time, the connector can only support either PCIe or SATA as the primary
> > host interface.
> > 
> > The connector provides a primary power supply of 3.3v, along with an
> > optional 1.8v VIO supply for the Adapter I/O buffer circuitry operating at
> > 1.8v sideband signaling.
> > 
> > The connector also supplies optional signals in the form of GPIOs for fine
> > grained power management.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> > ---
> >  .../bindings/connector/pcie-m2-m-connector.yaml    | 121 +++++++++++++++++++++
> >  1 file changed, 121 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/connector/pcie-m2-m-connector.yaml b/Documentation/devicetree/bindings/connector/pcie-m2-m-connector.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..2db23e60fdaefabde6f208e4ae0c9dded3a513f6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/connector/pcie-m2-m-connector.yaml
> > @@ -0,0 +1,121 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/connector/pcie-m2-m-connector.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: PCIe M.2 Mechanical Key M Connector
> > +
> > +maintainers:
> > +  - Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> > +
> > +description:
> > +  A PCIe M.2 M connector node represents a physical PCIe M.2 Mechanical Key M
> > +  connector. The Mechanical Key M connectors are used to connect SSDs to the
> > +  host system over PCIe/SATA interfaces. These connectors also offer optional
> > +  interfaces like USB, SMB.
> > +
> > +properties:
> > +  compatible:
> > +    const: pcie-m2-m-connector
> 
> Is this something generated from a standard that's going to be
> practically identical everywhere, or just some qcom thing?

This is as per the PCI Express M.2 Specification, nothing Qcom specific.

- Mani

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