linux-kernel - Re: [PATCH 2/4 v2] dt-bindings: memory: Add numeric LPDDR compatible string variant

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Date:   Mon, 12 Sep 2022 16:37:54 -0500
From:   Rob Herring <robh@...nel.org>
To:     Julius Werner <jwerner@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Jian-Jia Su <jjsu@...gle.com>, devicetree@...r.kernel.org,
        Dmitry Osipenko <digetx@...il.com>
Subject: Re: [PATCH 2/4 v2] dt-bindings: memory: Add numeric LPDDR compatible
 string variant

On Wed, 07 Sep 2022 16:29:12 -0700, Julius Werner wrote:
> This patch allows a new kind of compatible string for LPDDR parts in the
> device tree bindings, in addition to the existing hardcoded
> <vendor>,<part-number> strings. The new format contains manufacturer and
> part (revision) information in numerical form, such as lpddr3-ff,0201
> for an LPDDR3 part with manufacturer ID ff and revision ID 0201. This
> helps cases where LPDDR parts are probed at runtime by boot firmware and
> cannot be matched to hardcoded part numbers, such as the firmware on the
> qcom/sc7280-herobrine boards does (which supports 4 different memory
> configurations at the moment, and more are expected to be added later at
> a point where the boot firmware can no longer be updated to specifically
> accomodate them).
> 
> Signed-off-by: Julius Werner <jwerner@...omium.org>
> ---
>  .../memory-controllers/ddr/jedec,lpddr-props.yaml    | 10 ++++++++++
>  .../memory-controllers/ddr/jedec,lpddr2.yaml         |  8 +++++---
>  .../memory-controllers/ddr/jedec,lpddr3.yaml         | 12 ++++++++----
>  3 files changed, 23 insertions(+), 7 deletions(-)
> 
> Changelog:
> 
> - v2
>   - Updated commit message to describe intended use case as an example
> 

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