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Date: Thu, 3 Nov 2022 14:00:09 -0400
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>, 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
>>
>> 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.
>
>>
>>> @@ -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.
>
>>
>>> +
>>> +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...
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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