linux-kernel - Re: [PATCH 2/2] mailbox: Add support for QTI CPUCP mailbox controller

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Date:   Thu, 3 Nov 2022 11:02:39 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Sibi Sankar <quic_sibis@...cinc.com>
Cc:     andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, jassisinghbrar@...il.com,
        manivannan.sadhasivam@...aro.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, konrad.dybcio@...ainline.org,
        Gaurav Kohli <gkohli@...eaurora.org>
Subject: Re: [PATCH 2/2] mailbox: Add support for QTI CPUCP mailbox controller

On Wed, Sep 14, 2022 at 11:33:06AM +0530, Sibi Sankar wrote:
> Add support for CPUSS Control Processor (CPUCP) mailbox controller,
> this driver enables communication between AP and CPUCP by acting as
> a doorbell between them.
> 
> Signed-off-by: Gaurav Kohli <gkohli@...eaurora.org>
> [sibis: moved to mailbox and misc. cleanups]
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---

[...]

> +
> +	ret = devm_request_irq(&pdev->dev, cpucp->irq, qcom_cpucp_mbox_irq_fn,
> +			       IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND, "qcom_cpucp_mbox", cpucp);

1. Do you plan to use this mailbox during noirq phase of system suspend ?
   If not why do you have IRQF_NO_SUSPEND ? If yes, how will it be used ?
2. Why are you setting IRQF_TRIGGER_HIGH here ? Won't platform_get_irq()
   take care of that ? Otherwise how would you use this driver on the
   platform that need say IRQF_TRIGGER_LOW ?

-- 
Regards,
Sudeep