From: Rob Herring <robh@kernel.org>
To: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Jiri Slaby <jirislaby@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: serial: qcom,msm-uartdm: Vote for shared resources
Date: Wed, 29 Nov 2023 08:58:45 -0600 [thread overview]
Message-ID: <20231129145845.GA2459716-robh@kernel.org> (raw)
In-Reply-To: <20231128-serial-msm-dvfs-v1-1-4f290d20a4be@kernkonzept.com>
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@kernel.org>
> Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
> ---
> .../devicetree/bindings/serial/qcom,msm-uartdm.yaml | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
next prev parent reply other threads:[~2023-11-29 14:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-28 9:43 [PATCH 0/2] serial: msm: Allow scaling power domains and interconnect Stephan Gerhold
2023-11-28 9:43 ` [PATCH 1/2] dt-bindings: serial: qcom,msm-uartdm: Vote for shared resources Stephan Gerhold
2023-11-29 14:58 ` Rob Herring [this message]
2023-11-28 9:43 ` [PATCH 2/2] serial: msm: Use OPP table for DVFS support Stephan Gerhold
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