linux-kernel - Re: [PATCH v1 1/5] dt-bindings: dmaengine: qcom: gpi: Add additional arg to dma-cell property

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Message-ID: <2cd4af43-e600-4a39-8b8e-cb25b8c0168d@quicinc.com>
Date: Mon, 28 Oct 2024 11:27:52 +0530
From: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>
To: "Rob Herring (Arm)" <robh@...nel.org>
CC: <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>, <linux-i2c@...r.kernel.org>,
        Christian König <christian.koenig@....com>,
        Sumit Semwal
	<sumit.semwal@...aro.org>, <quic_vtanuku@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>, <dmaengine@...r.kernel.org>,
        Andi Shyti
	<andi.shyti@...nel.org>, <linaro-mm-sig@...ts.linaro.org>,
        <linux-media@...r.kernel.org>, <quic_msavaliy@...cinc.com>,
        <devicetree@...r.kernel.org>, <cros-qcom-dts-watchers@...omium.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        Vinod Koul
	<vkoul@...nel.org>
Subject: Re: [PATCH v1 1/5] dt-bindings: dmaengine: qcom: gpi: Add additional
 arg to dma-cell property



On 10/15/2024 6:56 PM, Rob Herring (Arm) wrote:
> 
> On Tue, 15 Oct 2024 17:37:46 +0530, Jyothi Kumar Seerapu wrote:
>> When high performance with multiple i2c messages in a single transfer
>> is required, employ Block Event Interrupt (BEI) to trigger interrupts
>> after specific messages transfer and the last message transfer,
>> thereby reducing interrupts.
>>
>> For each i2c message transfer, a series of Transfer Request Elements(TREs)
>> must be programmed, including config tre for frequency configuration,
>> go tre for holding i2c address and dma tre for holding dma buffer address,
>> length as per the hardware programming guide. For transfer using BEI,
>> multiple I2C messages may necessitate the preparation of config, go,
>> and tx DMA TREs. However, a channel TRE size of 64 is often insufficient,
>> potentially leading to failures due to inadequate memory space.
>>
>> Add additional argument to dma-cell property for channel TRE size.
>> With this, adjust the channel TRE size via the device tree.
>> The default size is 64, but clients can modify this value based on
>> their specific requirements.
>>
>> Signed-off-by: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>
>> ---
>>   Documentation/devicetree/bindings/dma/qcom,gpi.yaml | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/dma/qcom,gpi.yaml: properties:#dma-cells: 'minItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
> 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/dma/qcom,gpi.yaml: properties:#dma-cells: 'maxItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
> 	from schema $id: http://devicetree.org/meta-schemas/core.yaml#
> 
> doc reference errors (make refcheckdocs):
> 
> See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20241015120750.21217-2-quic_jseerapu@quicinc.com
> 
> The base for the series is generally the latest rc1. A different dependency
> should be noted in *this* patch.
> 
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
> 
> pip3 install dtschema --upgrade
> 
> Please check and re-submit after running the above command yourself. Note
> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> your schema. However, it must be unset to test all examples with your schema.
> 

Thanks, i followed the instructions and resolved errors which observed 
with 'make dt_binding_check'.
But in V2 patch, i have reverted the DT and binding changes related to 
adding new argument for dma-cells property and instead used existing 
value for channel TRE size in GPI driver.

Regrads,
JyothiKumar