linux-kernel - Re: [PATCH v2 3/5] thermal: tsens: Move 8996 get

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Date:   Tue, 12 Jun 2018 23:55:37 +0300
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] thermal: tsens: Move 8996 get_temp() to common
 code for reuse

On Tue, Jun 12, 2018 at 10:43 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Tue 12 Jun 03:54 PDT 2018, Amit Kucheria wrote:
> > diff --git a/drivers/thermal/qcom/tsens-8996.c b/drivers/thermal/qcom/tsens-8996.c
> [..]
> >  static const struct tsens_ops ops_8996 = {
> >       .init           = init_common,
> > -     .get_temp       = get_temp_8996,
> > +     .get_temp       = get_temp_tsens_v2,
> >  };
> >
> >  const struct tsens_data data_8996 = {
> > diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
> [..]
> > +int get_temp_tsens_v2(struct tsens_device *tmdev, int id, int *temp)
>
> I like the function name, but it's not really common for tsens, it's
> just common for tsens v2. Also as patch 4 shows we end up adding a set
> of essentially empty platform specific files for referencing this
> function.

> I would suggest that you instead rename tsens-8996.c to tsens-v2.c,
> rename ops_8996 to ops_v2 and either add new tsens_data for each
> platform or simply rename that too to data_v2 which we point to from
> tsens_table.

I was thinking of tsens-common.c as a library of tsens functions (v1
and v2). Do you want tsens-common.c to essentially become tsens-v1.c?
We'll end up with quite a bit of duplicated code in that case.

IIUC what you are suggesting, we'll still need to compile in
tsens-common.c even on v2 platforms.

> I think we should take it once step further and add "qcom,tsens-v2" as a
> valid compatible in tsens_table and make the dts do:

I like that idea.

>         comaptible = "qcom,msm8996-tsens", "qcom,tsens-v2";
>
> and
>         compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
>
> Regards,
> Bjorn