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Date: Thu, 3 Nov 2022 19:29:46 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
netdev@...r.kernel.org, nbd@....name, john@...ozen.org,
sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, matthias.bgg@...il.com,
linux-mediatek@...ts.infradead.org, Bo.Jiao@...iatek.com,
sujuan.chen@...iatek.com, ryder.Lee@...iatek.com,
evelyn.tsai@...iatek.com, devicetree@...r.kernel.org,
robh+dt@...nel.org, daniel@...rotopia.org,
krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v3 net-next 2/8] dt-bindings: net: mediatek: add WED RX
binding for MT7986 eth driver
> On 03/11/2022 13:51, Lorenzo Bianconi wrote:
> >>> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-boot.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-boot.yaml
> >>> new file mode 100644
> >>> index 000000000000..6c3c514c48ef
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-boot.yaml
Regarding "mediatek,mt7986-wed" compatible string it has been added to
mt7986a.dtsi in the commit below:
commit 00b9903996b3e1e287c748928606d738944e45de
Author: Lorenzo Bianconi <lorenzo@...nel.org>
Date: Tue Sep 20 12:11:13 2022 +0200
arm64: dts: mediatek: mt7986: add support for Wireless Ethernet Dispatch
> >>
> >> arm is only for top-level stuff. Choose appropriate subsystem, soc as
> >> last resort.
> >
> > these chips are used only for networking so is net folder fine?
>
> So this is some MMIO and no actual device? Then rather soc.
ack, I will move them there
>
> >
> >>
> >>> @@ -0,0 +1,47 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,mt7986-wo-boot.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title:
> >>> + MediaTek Wireless Ethernet Dispatch WO boot controller interface for MT7986
> >>> +
> >>> +maintainers:
> >>> + - Lorenzo Bianconi <lorenzo@...nel.org>
> >>> + - Felix Fietkau <nbd@....name>
> >>> +
> >>> +description:
> >>> + The mediatek wo-boot provides a configuration interface for WED WO
> >>> + boot controller on MT7986 soc.
> >>
> >> And what is "WED WO boot controller?
> >
> > WED WO is a chip used for networking packet processing offloaded to the Soc
> > (e.g. packet reordering). WED WO boot is the memory used to store start address
> > of wo firmware. Anyway I will let Sujuan comment on this.
>
> A bit more should be in description.
I will let Sujuan adding more details (since I do not have them :))
>
> >
> >>
> >>> +
> >>> +properties:
> >>> + compatible:
> >>> + items:
> >>> + - enum:
> >>> + - mediatek,mt7986-wo-boot
> >>> + - const: syscon
> >>> +
> >>> + reg:
> >>> + maxItems: 1
> >>> +
> >>> + interrupts:
> >>> + maxItems: 1
> >>> +
> >>> +required:
> >>> + - compatible
> >>> + - reg
> >>> +
> >>> +additionalProperties: false
> >>> +
> >>> +examples:
> >>> + - |
> >>> + soc {
> >>> + #address-cells = <2>;
> >>> + #size-cells = <2>;
> >>> +
> >>> + wo_boot: syscon@...94000 {
> >>> + compatible = "mediatek,mt7986-wo-boot", "syscon";
> >>> + reg = <0 0x15194000 0 0x1000>;
> >>> + };
> >>> + };
> >>> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-ccif.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-ccif.yaml
> >>> new file mode 100644
> >>> index 000000000000..6357a206587a
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-ccif.yaml
> >>> @@ -0,0 +1,50 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,mt7986-wo-ccif.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: MediaTek Wireless Ethernet Dispatch WO controller interface for MT7986
> >>> +
> >>> +maintainers:
> >>> + - Lorenzo Bianconi <lorenzo@...nel.org>
> >>> + - Felix Fietkau <nbd@....name>
> >>> +
> >>> +description:
> >>> + The mediatek wo-ccif provides a configuration interface for WED WO
> >>> + controller on MT7986 soc.
> >>
> >> All previous comments apply.
> >>
> >>> +
> >>> +properties:
> >>> + compatible:
> >>> + items:
> >>> + - enum:
> >>> + - mediatek,mt7986-wo-ccif
> >>> + - const: syscon
> >>> +
> >>> + reg:
> >>> + maxItems: 1
> >>> +
> >>> + interrupts:
> >>> + maxItems: 1
> >>> +
> >>> +required:
> >>> + - compatible
> >>> + - reg
> >>> + - interrupts
> >>> +
> >>> +additionalProperties: false
> >>> +
> >>> +examples:
> >>> + - |
> >>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> >>> + #include <dt-bindings/interrupt-controller/irq.h>
> >>> + soc {
> >>> + #address-cells = <2>;
> >>> + #size-cells = <2>;
> >>> +
> >>> + wo_ccif0: syscon@...a5000 {
> >>> + compatible = "mediatek,mt7986-wo-ccif", "syscon";
> >>> + reg = <0 0x151a5000 0 0x1000>;
> >>> + interrupts = <GIC_SPI 205 IRQ_TYPE_LEVEL_HIGH>;
> >>> + };
> >>> + };
> >>> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-dlm.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-dlm.yaml
> >>> new file mode 100644
> >>> index 000000000000..a499956d9e07
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7986-wo-dlm.yaml
> >>> @@ -0,0 +1,50 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,mt7986-wo-dlm.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: MediaTek Wireless Ethernet Dispatch WO hw rx ring interface for MT7986
> >>> +
> >>> +maintainers:
> >>> + - Lorenzo Bianconi <lorenzo@...nel.org>
> >>> + - Felix Fietkau <nbd@....name>
> >>> +
> >>> +description:
> >>> + The mediatek wo-dlm provides a configuration interface for WED WO
> >>> + rx ring on MT7986 soc.
> >>> +
> >>> +properties:
> >>> + compatible:
> >>> + const: mediatek,mt7986-wo-dlm
> >>> +
> >>> + reg:
> >>> + maxItems: 1
> >>> +
> >>> + resets:
> >>> + maxItems: 1
> >>> +
> >>> + reset-names:
> >>> + maxItems: 1
> >>> +
> >>> +required:
> >>> + - compatible
> >>> + - reg
> >>> + - resets
> >>> + - reset-names
> >>> +
> >>> +additionalProperties: false
> >>> +
> >>> +examples:
> >>> + - |
> >>> + soc {
> >>> + #address-cells = <2>;
> >>> + #size-cells = <2>;
> >>> +
> >>> + wo_dlm0: wo-dlm@...e8000 {
> >>
> >> Node names should be generic.
> >> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
> >
> > DLM is a chip used to store the data rx ring of wo firmware. I do not have a
> > better node name (naming is always hard). Can you please suggest a better name?
>
> The problem is that you added three new devices which seem to be for the
> same device - WED. It looks like some hacky way of avoid proper hardware
> description - let's model everything as MMIO and syscons...
is it fine to use syscon as node name even if we do not declare it in compatible
string for dlm?
Regards,
Lorenzo
>
> For such model - register addresses exposed as separate devices - I do
> not have appropriate name, but the real problem is not in the name. It's
> in the hardware description.
>
>
> Best regards,
> Krzysztof
>
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