linux-kernel - Re: [PATCH v5 2/5] arm64: dts: qcom: sm8450: Add opp table support to PCIe

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Date:   Thu, 7 Sep 2023 11:04:00 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        agross@...nel.org, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        vireshk@...nel.org, nm@...com, sboyd@...nel.org, mani@...nel.org
Cc:     lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com, rafael@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, quic_vbadigan@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_ramkri@...cinc.com, quic_parass@...cinc.com
Subject: Re: [PATCH v5 2/5] arm64: dts: qcom: sm8450: Add opp table support to
 PCIe

On 7.09.2023 08:00, Krishna chaitanya chundru wrote:
> PCIe needs to choose the appropriate performance state of RPMH power
> domain based up on the PCIe gen speed.
> 
> So let's add the OPP table support to specify RPMH performance states.
> 
> Use opp-level for the PCIe gen speed for easier use.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
[...]

> +
> +			pcie1_opp_table: opp-table {
> +				compatible = "operating-points-v2";
> +
> +				opp-1 {
> +					opp-level = <1>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +				};
> +
> +				opp-2 {
> +					opp-level = <2>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +				};
> +
> +				opp-3 {
> +					opp-level = <3>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
Is gen3 not supposed to require nom like on pcie0?

Also, can all non-maximum OPPs run at just low_svs?

Konrad