linux-kernel - Re: [PATCH v3 0/4] nvmem: qfprom: Avoid untouchable regions

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Date:   Mon, 2 Nov 2020 15:58:06 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Evan Green <evgreen@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] nvmem: qfprom: Avoid untouchable regions



On 29/10/2020 00:28, Evan Green wrote:
> Certain fuses are protected by the XPU such that the AP cannot
> access them. Attempting to do so causes an SError. Introduce an
> SoC-specific compatible string, and introduce support into the
> nvmem core to avoid accessing specified regions. Then use those
> new elements in the qfprom driver to avoid SErrors when usermode
> accesses certain registers.
> 
> Changes in v3:
>   - Fixed example (Doug and rob-bot)
>   - Use min()/max() macros instead of defining my own (Doug)
>   - Comment changes to indicate sorting (Doug)
>   - Add function to validate keepouts are proper (Doug)
> 
> Changes in v2:
>   - Add other soc compatible strings (Doug)
>   - Fix compatible string definition (Doug)
>   - Introduced keepout regions into the core (Srini)
>   - Use new core support in qfprom (Srini)
> 
> Evan Green (4):
>    dt-bindings: nvmem: Add soc qfprom compatible strings
>    arm64: dts: qcom: sc7180: Add soc-specific qfprom compat string
>    nvmem: core: Add support for keepout regions
>    nvmem: qfprom: Don't touch certain fuses

Except dts patch, I have applied all the patches, dts patch should go 
via arm-soc tree!


--srini

> 
>   .../bindings/nvmem/qcom,qfprom.yaml           |  17 +-
>   arch/arm64/boot/dts/qcom/sc7180.dtsi          |   2 +-
>   drivers/nvmem/core.c                          | 153 +++++++++++++++++-
>   drivers/nvmem/qfprom.c                        |  30 ++++
>   include/linux/nvmem-provider.h                |  17 ++
>   5 files changed, 211 insertions(+), 8 deletions(-)
>