linux-kernel - Re: [PATCH v3 3/4] nvmem: core: Add support for keepout regions

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Date:   Thu, 29 Oct 2020 09:17:59 -0700
From:   Evan Green <evgreen@...omium.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] nvmem: core: Add support for keepout regions

On Thu, Oct 29, 2020 at 5:08 AM Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
> Thanks Evan for doing this,
>
> On 29/10/2020 00:28, Evan Green wrote:
> > Introduce support into the nvmem core for arrays of register ranges
> > that should not result in actual device access. For these regions a
> > constant byte (repeated) is returned instead on read, and writes are
> > quietly ignored and returned as successful.
> >
> > This is useful for instance if certain efuse regions are protected
> > from access by Linux because they contain secret info to another part
> > of the system (like an integrated modem).
> >
> > Signed-off-by: Evan Green <evgreen@...omium.org>
>
> Overall the patch looks good for me.
> I have applied just this patch for more testing in next!
>
> I can pick up 1/4 and 4/4 once Rob's Ack/Reviews the patch!

Thank you, Srini!
-Evan