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SubjectRe: [PATCH v4 1/5] dt-bindings: PCI: add snps,dw-pcie.yaml
Em Thu, 15 Jul 2021 11:23:37 -0600
Rob Herring <robh@kernel.org> escreveu:

> On Tue, Jul 13, 2021 at 01:17:51PM +0200, Mauro Carvalho Chehab wrote:
> > Currently, the designware schema is defined on a text file:
> > designware-pcie.txt
> >
> > Convert the pci-bus part into a schema.
> >
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> > ---
> > .../devicetree/bindings/pci/snps,dw-pcie.yaml | 96 +++++++++++++++++++
> > MAINTAINERS | 1 +
> > 2 files changed, 97 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> > new file mode 100644
> > index 000000000000..fd372d715ab4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> > @@ -0,0 +1,96 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pci/snps,dw-pcie.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Synopsys DesignWare PCIe interface
> > +
> > +maintainers:
> > + - Jingoo Han <jingoohan1@gmail.com>
> > + - Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> > +
> > +description: |
> > + Synopsys DesignWare PCIe host controller
> > +
> > +allOf:
> > + - $ref: /schemas/pci/pci-bus.yaml#
> > +
> > +properties:
> > + compatible:
> > + anyOf:
> > + - {}
> > + - const: snps,dw-pcie
> > +
> > + reg:
> > + description: |
> > + It should contain Data Bus Interface (dbi) and config registers for all
> > + versions.
> > + For designware core version >= 4.80, it may contain ATU address space.
> > + minItems: 2
> > + maxItems: 4
> > +
> > + reg-names:
> > + minItems: 2
> > + maxItems: 4
> > + items:
> > + enum: [dbi, dbi2, config, atu, addr_space, app, elbi, mgmt]
>
> Isn't 'config' only for host and 'addr_space' only for endpoint?

The problem on enforcing an enum here is that severa *.dts files violate it.
In the specific case of 'addr_space', there is (are?) place(s) where the wrong
compatible was used, like on arch/arm/boot/dts/artpec6.dtsi:

pcie: pcie@f8050000 {
compatible = "axis,artpec6-pcie", "snps,dw-pcie";
reg = <0xf8050000 0x2000
0xf8040000 0x1000
0xc0000000 0x2000>;
reg-names = "dbi", "phy", "config";
#address-cells = <3>;
#size-cells = <2>;
device_type = "pci";
/* downstream I/O */
ranges = <0x81000000 0 0 0xc0002000 0 0x00010000
/* non-prefetchable memory */
0x82000000 0 0xc0012000 0xc0012000 0 0x1ffee000>;
num-lanes = <2>;
bus-range = <0x00 0xff>;
interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "msi";
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0x7>;
interrupt-map = <0 0 0 1 &intc GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>,
<0 0 0 2 &intc GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
<0 0 0 3 &intc GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
<0 0 0 4 &intc GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
axis,syscon-pcie = <&syscon>;
status = "disabled";
};

pcie_ep: pcie_ep@f8050000 {
compatible = "axis,artpec6-pcie-ep", "snps,dw-pcie";
reg = <0xf8050000 0x2000
0xf8051000 0x2000
0xf8040000 0x1000
0xc0000000 0x20000000>;
reg-names = "dbi", "dbi2", "phy", "addr_space";
num-ib-windows = <6>;
num-ob-windows = <2>;
num-lanes = <2>;
axis,syscon-pcie = <&syscon>;
status = "disabled";
};

(funny enough, this is not generating warnings here).

Btw, besides the above, there are some DTS that use something different
from what's there at the enum:


$ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 dtbs_check 2>&1 |tee dtbs_check.log
$ grep "\['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt'\]" dtbs_check.log|sed "s,From schema:,,"|cut -d: -f 2-|cut -d' ' -f 4-|sort|uniq -c|sort -n -r
51 'ctrl' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
44 'parf' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
18 'cfg' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']
4 'link' is not one of ['dbi', 'dbi2', 'config', 'atu', 'app', 'elbi', 'mgmt']

In order to use an enum and not having warnings, the enum should be
instead:

reg-names:
minItems: 2
maxItems: 4
items:
enum: [dbi, dbi2, config, atu, app, elbi, mgmt, ctrl, parf, cfg, link]


Thanks,
Mauro

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