linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: sm6350: Add interconnect support

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Message-ID: <b079a211-d387-7958-bbe2-c41cac00d269@kernel.org>
Date:   Thu, 28 Apr 2022 00:43:28 +0300
From:   Georgi Djakov <djakov@...nel.org>
To:     Luca Weiss <luca.weiss@...rphone.com>,
        linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: qcom: sm6350: Add interconnect support

On 22.04.22 17:40, Luca Weiss wrote:
> Add all the different NoC providers that are found in SM6350 and
> populate different nodes that use the interconnect properties.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
> Newer SoCs seem to have switched to using #interconnect-cells = <2>;
> Is this something that should be done for all new implementations as
> well? The 'tag' in the second cell seems to be 0 for all cases in
> mainline except CPU.

Yes, it's recommended to use #interconnect-cells = <2> (if you care about
power management). This is to support different bandwidth configurations
that are toggled by RPMh, depending on the power state of the CPU.

Thanks,
Georgi