linux-kernel - Re: [PATCH v4 0/4] Apple M1 PCIe DT bindings

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Date:   Tue, 21 Sep 2021 12:01:36 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Mark Kettenis <mark.kettenis@...all.nl>
Cc:     devicetree@...r.kernel.org, alyssa@...enzweig.io,
        Mark Kettenis <kettenis@...nbsd.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Jim Quinlan <jim2101024@...il.com>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 0/4] Apple M1 PCIe DT bindings

On Fri, 27 Aug 2021 18:15:25 +0100,
Mark Kettenis <mark.kettenis@...all.nl> wrote:
> 
> From: Mark Kettenis <kettenis@...nbsd.org>
> 
> This small series adds bindings for the PCIe controller found on the
> Apple M1 SoC.
> 
> At this point, the primary consumer for these bindings is U-Boot.
> With these bindings U-Boot can bring up the links for the root ports
> of the PCIe root complex.  A simple OS driver can then provide
> standard ECAM access and manage MSI interrupts to provide access
> to the built-in Ethernet and XHCI controllers of the Mac mini.
> 
> The Apple controller incorporates Synopsys Designware PCIe logic
> to implement its root port.  But unlike other hardware currently
> supported by U-Boot and the Linux kernel the Apple hardware
> integrates multiple root ports.  As such the existing bindings
> for the DWC PCIe interface can't be used.  There is a single ECAM
> space for all root space, but separate GPIOs to take the PCI devices
> on those ports out of reset.  Therefore the standard "reset-gpio" and
> "max-link-speed" properties appear on the child nodes representing
> the PCI devices that correspond to the individual root ports.
> 
> MSIs are handled by the PCIe controller and translated into "regular
> interrupts".  A range of 32 MSIs is provided.  These 32 MSIs can be
> distributed over the root ports as the OS sees fit by programming the
> PCIe controller port registers.
> 
> This now adds an MSI controller binding schema and uses the generic
> msi-ranges property to specify how the MSIs are mapped to interrupts
> on the AIC.  I copied some of the description text in the MSI
> controller binding schema from msi.txt but it may need some further
> tweaks to make sense.
> 
> Patch 2/2 of this series depends on the pinctrl series I sent earlier
> and will probably go through Hector Martin's Apple M1 SoC tree.
> 
> 
> Changelog:
> 
> v4: - Convert MSI controller binding to YAML
>     - Add generic msi-ranges property to MSI controller binding
>     - Fix typos/formatting in apple,pcie binding
>     - Use generic MSI controller binding in apple,pcie
> 
> v3: - Remove unneeded include in example
> 
> v2: - Adjust name for ECAM in "reg-names"
>     - Drop "phy" registers
>     - Expand description
>     - Add description for "interrupts"
>     - Fix incorrect minItems for "interrupts"
>     - Fix incorrect MaxItems for "reg-names"
>     - Document the use of "msi-controller", "msi-parent", "iommu-map" and
>       "iommu-map-mask"
>     - Fix "bus-range" and "iommu-map" properties in the example
> 
> Mark Kettenis (4):
>   dt-bindings: interrupt-controller: Convert MSI controller to
>     json-schema
>   dt-bindings: interrupt-controller: msi: Add msi-ranges property
>   dt-bindings: pci: Add DT bindings for apple,pcie
>   arm64: apple: Add PCIe node
> 
>  .../interrupt-controller/msi-controller.yaml  |  42 +++++
>  .../devicetree/bindings/pci/apple,pcie.yaml   | 165 ++++++++++++++++++
>  .../bindings/pci/brcm,stb-pcie.yaml           |   1 +
>  .../bindings/pci/microchip,pcie-host.yaml     |   1 +
>  MAINTAINERS                                   |   1 +
>  arch/arm64/boot/dts/apple/t8103.dtsi          |  63 +++++++
>  6 files changed, 273 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/msi-controller.yaml
>  create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml

With Rob's comments addressed, and the fix on the M1 RC MMIO region,
for the whole series:

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.