Message-ID: <5d706b02fb23c2dd6422306ff8d43a90910e36b8.camel@suse.de>
Date:   Thu, 14 Nov 2019 14:15:13 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        mbrugger@...e.com, linux-pci@...r.kernel.org, phil@...pberrypi.org,
        linux-kernel@...r.kernel.org, f.fainelli@...il.com,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, james.quinlan@...adcom.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andrew Murray <andrew.murray@....com>,
        linux-arm-kernel@...ts.infradead.org, wahrenst@....net
Subject: Re: [PATCH 1/4] dt-bindings: pci: add bindings for brcmstb's PCIe
 device

On Tue, 2019-11-12 at 22:15 -0600, Rob Herring wrote:
> On Wed, Nov 06, 2019 at 10:45:23PM +0100, Nicolas Saenz Julienne wrote:
> > From: Jim Quinlan <james.quinlan@...adcom.com>
> > 
> > The DT bindings description of the brcmstb PCIe device is described.
> > This node can only be used for now on the Raspberry Pi 4.
> > 
> > This was based on Jim's original submission[1], converted to yaml and
> > adapted to the RPi4 case.
> > 
> > [1] https://patchwork.kernel.org/patch/10605937/
> > 
> > Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> > Co-developed-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > ---
> >  .../bindings/pci/brcm,stb-pcie.yaml           | 116 ++++++++++++++++++
> >  1 file changed, 116 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> 
> I'm working on a common PCI host schema that should cut down some of the 
> standard props.

Is there a way for me to have a look at it so I can rebase the binding on top
of it?

> > diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> > b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> > new file mode 100644
> > index 000000000000..0b81c26f8568
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
> > @@ -0,0 +1,116 @@
> > +# SPDX-License-Identifier: GPL-2.0
> 
> Dual license new bindings please:
> 
> # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

Noted

> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pci/brcm,stb-pcie.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Brcmstb PCIe Host Controller Device Tree Bindings
> > +
> > +maintainers:
> > +  - Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > +
> > +properties:
> > +  compatible:
> > +    const: brcm,bcm2711-pcie # The Raspberry Pi 4
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    minItems: 1
> > +    maxItems: 2
> > +    items:
> > +      - description: PCIe host controller
> > +      - description: builtin MSI controller
> > +
> > +  interrupt-names:
> > +    minItems: 1
> > +    maxItems: 2
> > +    items:
> > +      - const: pcie
> > +      - const: msi
> > +
> > +  "#address-cells":
> > +    const: 3
> > +
> > +  "#size-cells":
> > +    const: 2
> > +
> > +  "#interrupt-cells":
> > +    const: 1
> > +
> > +  interrupt-map-mask: true
> > +
> > +  interrupt-map: true
> 
> 4 entries?

You're right, for this specific case, as XHCI is hardwired and only uses one
irq, we'd only need the first entry.  Although who knows, maybe they are wired
nonetheless. I guess it's safer to assume they aren't for now.

> You'll need to bracket <> each entry in the example and dts.

Ok

> > +
> > +  ranges: true
> 
> How many entries?

One, I'll update it.

> > +
> > +  dma-ranges: true
> 
> How many entries?

One, I'll update it.

> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    items:
> > +      - const: sw_pcie
> > +
> > +  msi-controller:
> > +    description: Identifies the node as an MSI controller.
> > +    type: boolean
> > +
> > +  msi-parent:
> > +    description: MSI controller the device is capable of using.
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +
> > +  linux,pci-domain:
> > +    description: PCI domain ID. Should be unique for each host controller.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +  brcm,enable-ssc:
> > +    description: Indicates usage of spread-spectrum clocking.
> > +    type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - "#address-cells"
> > +  - "#size-cells"
> > +  - "#interrupt-cells"
> > +  - interrupt-map-mask
> > +  - interrupt-map
> > +  - ranges
> > +  - dma-ranges
> > +  - linux,pci-domain
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > +    scb {
> > +            #address-cells = <2>;
> > +            #size-cells = <1>;
> > +            pcie0: pcie@...00000 {
> > +                    compatible = "brcm,bcm2711-pcie";
> > +                    reg = <0x0 0x7d500000 0x9310>;
> > +                    #address-cells = <3>;
> > +                    #size-cells = <2>;
> > +                    #interrupt-cells = <1>;
> > +                    interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
> > +                                 <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
> > +                    interrupt-names = "pcie", "msi";
> > +                    interrupt-map-mask = <0x0 0x0 0x0 0x7>;
> > +                    interrupt-map = <0 0 0 1 &gicv2 GIC_SPI 143
> > IRQ_TYPE_LEVEL_HIGH
> > +                                     0 0 0 2 &gicv2 GIC_SPI 144
> > IRQ_TYPE_LEVEL_HIGH
> > +                                     0 0 0 3 &gicv2 GIC_SPI 145
> > IRQ_TYPE_LEVEL_HIGH
> > +                                     0 0 0 4 &gicv2 GIC_SPI 146
> > IRQ_TYPE_LEVEL_HIGH>;
> > +                    msi-parent = <&pcie0>;
> > +                    msi-controller;
> > +                    ranges = <0x02000000 0x0 0xf8000000 0x6 0x00000000 0x0
> > 0x04000000>;
> > +                    dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
> > 0x0 0x80000000>;
> > +                    linux,pci-domain = <0>;
> > +                    brcm,enable-ssc;
> > +            };
> > +    };
> > -- 
> > 2.23.0
> > 
> 
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