linux-kernel - Re: [PATCH 1/7] dt-bindings: nfc: nxp,nci: convert to dtschema

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Date:   Sun, 10 Oct 2021 22:58:59 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-nfc@...ts.01.org, devicetree@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Mark Greer <mgreer@...malcreek.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Charles Gorand <charles.gorand@...innov.com>
Subject: Re: [PATCH 1/7] dt-bindings: nfc: nxp,nci: convert to dtschema

On 10/10/2021 21:31, Rob Herring wrote:
> On Sun, 10 Oct 2021 16:23:11 +0200, Krzysztof Kozlowski wrote:
>> Convert the NXP NCI NFC controller to DT schema format.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> ---
>>  .../devicetree/bindings/net/nfc/nxp,nci.yaml  | 61 +++++++++++++++++++
>>  .../devicetree/bindings/net/nfc/nxp-nci.txt   | 33 ----------
>>  MAINTAINERS                                   |  1 +
>>  3 files changed, 62 insertions(+), 33 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml
>>  delete mode 100644 Documentation/devicetree/bindings/net/nfc/nxp-nci.txt
>>
> 
> Running 'make dtbs_check' with the schema in this patch gives the
> following warnings. Consider if they are expected or the schema is
> incorrect. These may not be new warnings.
> 
> Note that it is not yet a requirement to have 0 warnings for dtbs_check.
> This will change in the future.
> 
> Full log is available here: https://patchwork.ozlabs.org/patch/1539010
> 
> 
> nfc@28: 'clock-frequency' is a required property
> 	arch/arm64/boot/dts/qcom/msm8916-huawei-g7.dt.yaml
> 

Hmm, this actually looks as mistake in bindings. First, clock-frequency
is a property of a I2C bus, not I2C child device. Second, it should not
be a required property anyway, as I2C will choose a default one matching
driver (e.g. standard speed of 100 kHz).

Except the trf7970a NFC driver, none of other NFC drivers parse the
clock-frequency.

Best regards,
Krzysztof