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Date: Fri, 4 Jun 2021 23:32:40 +0200
From: Sergio Paracuellos <sergio.paracuellos@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: "open list:MIPS" <linux-mips@...r.kernel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
John Crispin <john@...ozen.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-staging@...ts.linux.dev,
Greg KH <gregkh@...uxfoundation.org>,
NeilBrown <neil@...wn.name>,
Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: mt7621-pci: PCIe binding documentation
for MT7621 SoCs
Hi Rob,
Thanks for the review.
On Fri, Jun 4, 2021 at 9:35 PM Rob Herring <robh@...nel.org> wrote:
>
> On Sat, May 15, 2021 at 02:40:52PM +0200, Sergio Paracuellos wrote:
> > Add device tree binding documentation for PCIe in MT7621 SoCs.
> >
> > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> > ---
> > .../bindings/pci/mediatek,mt7621-pci.yaml | 149 ++++++++++++++++++
> > 1 file changed, 149 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/pci/mediatek,mt7621-pci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/pci/mediatek,mt7621-pci.yaml b/Documentation/devicetree/bindings/pci/mediatek,mt7621-pci.yaml
> > new file mode 100644
> > index 000000000000..7f5f9d583032
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/mediatek,mt7621-pci.yaml
> > @@ -0,0 +1,149 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pci/mediatek,mt7621-pci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MediaTek MT7621 PCIe controller
> > +
> > +maintainers:
> > + - Sergio Paracuellos <sergio.paracuellos@...il.com>
> > +
> > +description: |+
> > + MediaTek MT7621 PCIe subsys supports single Root complex (RC)
> > + with 3 Root Ports. Each Root Ports supports a Gen1 1-lane Link
> > +
> > +allOf:
> > + - $ref: /schemas/pci/pci-bus.yaml#
> > +
> > +properties:
> > + compatible:
> > + const: mediatek,mt7621-pci
> > +
> > + reg:
> > + items:
> > + - description: host-pci bridge registers
> > + - description: pcie port 0 RC control registers
> > + - description: pcie port 1 RC control registers
> > + - description: pcie port 2 RC control registers
> > +
> > + ranges:
> > + maxItems: 2
> > +
> > + resets:
> > + items:
> > + - description: pcie port 0 reset.
> > + - description: pcie port 1 reset.
> > + - description: pcie port 2 reset.
> > +
> > + reset-names:
> > + items:
> > + - const: pcie0
> > + - const: pcie1
> > + - const: pcie2
> > +
> > + clocks:
> > + items:
> > + - description: pcie port 0 clock.
> > + - description: pcie port 1 clock.
> > + - description: pcie port 2 clock.
> > +
> > + clock-names:
> > + items:
> > + - const: pcie0
> > + - const: pcie1
> > + - const: pcie2
> > +
> > + phys:
> > + items:
> > + - description: Dual-ported phy for pcie port 0 and 1.
> > + - description: Phy for pcie port 2.
> > +
> > + phy-names:
> > + items:
> > + - const: pcie-phy0
> > + - const: pcie-phy2
>
> If you're going to keep the ports (and I think that's right because
> there's only a single PCI address space AFAICT), then I think you should
> move resets, clocks, and phys into each port node.
>
> So you'll need to define 'pcie@[0-2],0' node with those properties under
> it.
Ok I will move these stuff to each port node. So each port node will
be similar to:
pcie@0,0 {
reg = <0x0000 0 0 0 0>;
#address-cells = <3>;
#size-cells = <2>;
device_type = "pci";
#interrupt-cells = <1>;
clocks = <&clkctrl 24>;
resets = <&rstctrl 24>;
phys = <&pcie0_phy 1>;
interrupt-map-mask = <0 0 0 0>;
interrupt-map = <0 0 0 0 &gic GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH>;
ranges;
};
How can I be sure by schema that the clocks, reset and phy properties
are in each port node if I move them from the parent? By now each port
node is just validating because of ' $ref:
/schemas/pci/pci-bus.yaml#'.
Thanks in advance for your time.
Best regards,
Sergio Paracuellos
>
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - ranges
> > + - "#interrupt-cells"
> > + - interrupt-map-mask
> > + - interrupt-map
> > + - resets
> > + - reset-names
> > + - clocks
> > + - clock-names
> > + - phys
> > + - phy-names
> > + - reset-gpios
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/gpio/gpio.h>
> > + #include <dt-bindings/interrupt-controller/mips-gic.h>
> > +
> > + pcie: pcie@...40000 {
> > + compatible = "mediatek,mt7621-pci";
> > + reg = <0x1e140000 0x100>,
> > + <0x1e142000 0x100>,
> > + <0x1e143000 0x100>,
> > + <0x1e144000 0x100>;
> > +
> > + #address-cells = <3>;
> > + #size-cells = <2>;
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pcie_pins>;
> > + device_type = "pci";
> > + ranges = <0x02000000 0 0x00000000 0x60000000 0 0x10000000>, /* pci memory */
> > + <0x01000000 0 0x00000000 0x1e160000 0 0x00010000>; /* io space */
> > + #interrupt-cells = <1>;
> > + interrupt-map-mask = <0xF800 0 0 0>;
> > + interrupt-map = <0x0000 0 0 0 &gic GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH>,
> > + <0x0800 0 0 0 &gic GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>,
> > + <0x1000 0 0 0 &gic GIC_SHARED 25 IRQ_TYPE_LEVEL_HIGH>;
> > + resets = <&rstctrl 24>, <&rstctrl 25>, <&rstctrl 26>;
> > + reset-names = "pcie0", "pcie1", "pcie2";
> > + clocks = <&clkctrl 24>, <&clkctrl 25>, <&clkctrl 26>;
> > + clock-names = "pcie0", "pcie1", "pcie2";
> > + phys = <&pcie0_phy 1>, <&pcie2_phy 0>;
> > + phy-names = "pcie-phy0", "pcie-phy2";
> > + reset-gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
> > +
> > + pcie@0,0 {
> > + reg = <0x0000 0 0 0 0>;
> > + #address-cells = <3>;
> > + #size-cells = <2>;
> > + device_type = "pci";
> > + #interrupt-cells = <1>;
> > + interrupt-map-mask = <0 0 0 0>;
> > + interrupt-map = <0 0 0 0 &gic GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH>;
> > + ranges;
> > + };
> > +
> > + pcie@1,0 {
> > + reg = <0x0800 0 0 0 0>;
> > + #address-cells = <3>;
> > + #size-cells = <2>;
> > + device_type = "pci";
> > + #interrupt-cells = <1>;
> > + interrupt-map-mask = <0 0 0 0>;
> > + interrupt-map = <0 0 0 0 &gic GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>;
> > + ranges;
> > + };
> > +
> > + pcie@2,0 {
> > + reg = <0x1000 0 0 0 0>;
> > + #address-cells = <3>;
> > + #size-cells = <2>;
> > + device_type = "pci";
> > + #interrupt-cells = <1>;
> > + interrupt-map-mask = <0 0 0 0>;
> > + interrupt-map = <0 0 0 0 &gic GIC_SHARED 25 IRQ_TYPE_LEVEL_HIGH>;
> > + ranges;
> > + };
> > + };
> > +...
> > --
> > 2.25.1
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