linux-kernel - Re: [PATCH v3 04/10] nvmem: qfprom: Add support for secure reading on QDU1000/QRU1000

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Date:   Fri, 12 May 2023 20:31:29 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Komal Bajaj <quic_kbajaj@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 04/10] nvmem: qfprom: Add support for secure reading on QDU1000/QRU1000

On Fri, 12 May 2023 at 20:01, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 12/05/2023 14:21, Komal Bajaj wrote:
> > Add qfprom driver support for QDU1000/QRU1000 SOCs.
> >
> > Signed-off-by: Komal Bajaj <quic_kbajaj@...cinc.com>
> > ---
> >  drivers/nvmem/qfprom.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
> > index 20662e2d3732..12a7981a8a71 100644
> > --- a/drivers/nvmem/qfprom.c
> > +++ b/drivers/nvmem/qfprom.c
> > @@ -109,6 +109,10 @@ struct qfprom_soc_compatible_data {
> >       bool secure;
> >  };
> >
> > +static const struct qfprom_soc_compatible_data qdu1000_qfprom = {
> > +     .secure = true
> > +};
> > +
> >  static const struct nvmem_keepout sc7180_qfprom_keepout[] = {
> >       {.start = 0x128, .end = 0x148},
> >       {.start = 0x220, .end = 0x228}
> > @@ -490,6 +494,7 @@ static int qfprom_probe(struct platform_device *pdev)
> >
> >  static const struct of_device_id qfprom_of_match[] = {
> >       { .compatible = "qcom,qfprom",},
> > +     { .compatible = "qcom,qdu1000-qfprom", .data = &qdu1000_qfprom},
> >       { .compatible = "qcom,sc7180-qfprom", .data = &sc7180_qfprom},
>
> I have doubts that this is still compatible with qcom,qfprom. It uses
> entirely different read method. That's why generic fallbacks are bad,
> one more case to my growing list of awesome examples. :)

Yes, it looks like it should be 'qcom,qdu1000-qfprom",
"qcom,scm-qfprom". And possibly a separate driver for scm-qfprom.


-- 
With best wishes
Dmitry