linux-kernel - Re: [RFC PATCH v2 0/5] iio: adc: qcom-spmi-vadc: Propagate fw node label to userspace

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Message-ID: <20230122234137.fyziba55n3b6tx3j@SoMainline.org>
Date:   Mon, 23 Jan 2023 00:41:37 +0100
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/5] iio: adc: qcom-spmi-vadc: Propagate fw node
 label to userspace

On 2023-01-22 16:59:47, Jonathan Cameron wrote:
> On Mon, 16 Jan 2023 23:09:04 +0100
> Marijn Suijten <marijn.suijten@...ainline.org> wrote:
> 
> > Implement read_label in qcom-spmi-vadc to see DT-specified label names
> > in userspace.  At the same time clear up some documentation around
> > extend_name to promote read_label, and normalize similar code in
> > qcom-spmi-adc5.
> > 
> 
> I think this is a good route forwards, but it is making changes
> to ABI so I definitely want input on this from at least one of
> the qualcomm maintainers before I pick it up - particularly
> the changes in patch 3.
> 
> Don't want to cause anyone nasty surprises.

Ack, patch 3 is the odd one of the bunch (as discussed many times
prior).  It is an ABI break and would effectively obsolete "iio: adc:
qcom-spmi-adc5: Fix the channel name" [1] as it then only affects a few
dev_err/dev_dbg.  Let's wait and hear from Qcom maintainers.

[1]: https://lore.kernel.org/linux-arm-msm/20230118100623.42255-1-andriy.shevchenko@linux.intel.com/

- Marijn