linux-kernel - Re: [PATCH 1/2] dt-bindings: serial: qcom,msm-uartdm: Vote for shared resources

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Date:   Wed, 29 Nov 2023 08:58:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Stephan Gerhold <stephan.gerhold@...nkonzept.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: serial: qcom,msm-uartdm: Vote for
 shared resources

On Tue, Nov 28, 2023 at 10:43:32AM +0100, Stephan Gerhold wrote:
> Document power-domains, operating-points-v2 and interconnects to allow
> making performance state votes for certain clock frequencies of the UART
> DM controller. The interconnect path to DRAM is needed when UART DM is
> used together with a DMA engine.
> 
> Voting for these shared resources is necessary to guarantee performance
> with power management enabled. Otherwise these resources might run at
> minimal performance state which is not sufficient for certain UART
> baud rates.

I find the subject a bit strange because voting is a QCom term/concept 
and somewhat outside the scope of the binding. The justification is 
really just that the h/w has these resources. In any case,

Reviewed-by: Rob Herring <robh@...nel.org>

> Signed-off-by: Stephan Gerhold <stephan.gerhold@...nkonzept.com>
> ---
>  .../devicetree/bindings/serial/qcom,msm-uartdm.yaml         | 13 +++++++++++++
>  1 file changed, 13 insertions(+)