linux-kernel - Re: [PATCH v2 01/16] dt-bindings: dma: qcom,bam: Add bam pipe lock

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Message-ID: <51653ef6-07f3-5419-e85b-b3e26958173f@quicinc.com>
Date: Sat, 24 Aug 2024 12:34:53 +0530
From: Md Sadre Alam <quic_mdalam@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC: <vkoul@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <thara.gopinath@...il.com>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <gustavoars@...nel.org>, <u.kleine-koenig@...gutronix.de>,
        <kees@...nel.org>, <agross@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>, <quic_srichara@...cinc.com>,
        <quic_varada@...cinc.com>, <quic_utiwari@...cinc.com>
Subject: Re: [PATCH v2 01/16] dt-bindings: dma: qcom,bam: Add bam pipe lock



On 8/23/2024 9:09 PM, Manivannan Sadhasivam wrote:
> On Thu, Aug 15, 2024 at 02:27:10PM +0530, Md Sadre Alam wrote:
>> BAM having pipe locking mechanism. The Lock and Un-Lock bit
>> should be set on CMD descriptor only. Upon encountering a
>> descriptor with Lock bit set, the BAM will lock all other
>> pipes not related to the current pipe group, and keep
>> handling the current pipe only until it sees the Un-Lock
>> set.
>>
>> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
>> ---
>>
>> Change in [v2]
>>
>> * Added initial support for dt-binding
>>
>> Change in [v1]
>>
>> * This patch was not included in [v1]
>>
>>   Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> index 3ad0d9b1fbc5..91cc2942aa62 100644
>> --- a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> +++ b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> @@ -77,6 +77,12 @@ properties:
>>         Indicates that the bam is powered up by a remote processor but must be
>>         initialized by the local processor.
>>   
>> +  qcom,bam_pipe_lock:
>> +    type: boolean
>> +    description:
>> +      Indicates that the bam pipe needs locking or not based on client driver
>> +      sending the LOCK or UNLOK bit set on command descriptor.
>> +
> 
> This looks like a pure driver implementation and doesn't belong to the DT at
> all. Why can't you add a logic in the driver to use the lock based on some
> detection mechanism?
   Sure , will use BAM_SW_VERSION register for detection mechanism, since this
   support only for bam version above 1.4.0.
> 
> - Mani
> 
>>     reg:
>>       maxItems: 1
>>   
>> @@ -92,6 +98,8 @@ anyOf:
>>         - qcom,powered-remotely
>>     - required:
>>         - qcom,controlled-remotely
>> +  - required:
>> +      - qcom,bam_pipe_lock
>>     - required:
>>         - clocks
>>         - clock-names
>> -- 
>> 2.34.1
>>
>>
>