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

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Message-ID: <20201102223457.GA65067@builder.lan>
Date:   Mon, 2 Nov 2020 16:34:57 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Evan Green <evgreen@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        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 Mon 02 Nov 09:58 CST 2020, Srinivas Kandagatla wrote:

> 
> 
> 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!
> 

And I've picked the dts patch.

Thank you,
Bjorn

> 
> --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(-)
> >