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

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Message-ID: <20240823153958.vk4naz34vgkqzhrb@thinkpad>
Date: Fri, 23 Aug 2024 21:09:58 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>
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 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?

- 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
> 
> 

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