linux-kernel - Re: [PATCH v2 05/14] dt-bindings: arm: mediatek: document the pcie mirror node on MT7622

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Date:   Fri, 8 Apr 2022 11:03:14 +0200
From:   Felix Fietkau <nbd@....name>
To:     Rob Herring <robh@...nel.org>
Cc:     netdev@...r.kernel.org, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/14] dt-bindings: arm: mediatek: document the pcie
 mirror node on MT7622

On 07.04.22 19:19, Rob Herring wrote:
> On Tue, Apr 05, 2022 at 09:57:46PM +0200, Felix Fietkau wrote:
>> From: Lorenzo Bianconi <lorenzo@...nel.org>
>> 
>> This patch adds the pcie mirror document bindings for MT7622 SoC.
>> The feature is used for intercepting PCIe MMIO access for the WED core
>> Add related info in mediatek-net bindings.
>> 
>> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
>> Signed-off-by: Felix Fietkau <nbd@....name>
>> ---
>>  .../mediatek/mediatek,mt7622-pcie-mirror.yaml | 42 +++++++++++++++++++
>>  .../devicetree/bindings/net/mediatek-net.txt  |  2 +
>>  2 files changed, 44 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml
>> new file mode 100644
>> index 000000000000..9fbeb626ab23
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml
>> @@ -0,0 +1,42 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/arm/mediatek/mediatek,mt7622-pcie-mirror.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: MediaTek PCIE Mirror Controller for MT7622
>> +
>> +maintainers:
>> +  - Lorenzo Bianconi <lorenzo@...nel.org>
>> +  - Felix Fietkau <nbd@....name>
>> +
>> +description:
>> +  The mediatek PCIE mirror provides a configuration interface for PCIE
>> +  controller on MT7622 soc.
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - enum:
>> +          - mediatek,mt7622-pcie-mirror
>> +      - const: syscon
> 
> This doesn't sound like a syscon to me. Are there multiple clients or
> functions in this block? A 'syscon' property is not the only way to
> create a regmap if that's what you need.
It's used only by the WED code in the ethernet driver, but there are 
multiple WED instances and only a single pcie-mirror block containing 
configuration for them.

- Felix