linux-kernel - Re: [PATCH 3/5] clk: qcom: clk-rpm: convert to parent

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Date:   Wed, 6 Jul 2022 12:21:55 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] clk: qcom: clk-rpm: convert to parent_data API

On Wed, Jul 06, 2022 at 11:27:34AM +0300, Dmitry Baryshkov wrote:
> On Tue, 5 Jul 2022 at 23:56, Christian Marangi <ansuelsmth@...il.com> wrote:
> >
> > Convert clk-rpm driver to parent_data API and change parent names to cxo
> > and pxo instead of the board variant as pxo_board is an ancient name and
> > pxo should be used instead.
> >
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> >  drivers/clk/qcom/clk-rpm.c | 24 ++++++++++++++++--------
> >  1 file changed, 16 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/clk/qcom/clk-rpm.c b/drivers/clk/qcom/clk-rpm.c
> > index a18811c38018..d45a8b0fc97c 100644
> > --- a/drivers/clk/qcom/clk-rpm.c
> > +++ b/drivers/clk/qcom/clk-rpm.c
> > @@ -23,6 +23,14 @@
> >  #define QCOM_RPM_SCALING_ENABLE_ID                     0x2
> >  #define QCOM_RPM_XO_MODE_ON                            0x2
> >
> > +static const struct clk_parent_data gcc_pxo[] = {
> > +       { .fw_name = "pxo", .name = "pxo" },
> 
> This means that the core clock would look for the DT clock named 'pxo'
> with the fallback to the global clock named 'pxo'. Fallback is
> required to keep compatibility with older DT files, not having the
> clocks/clock-names properties.
> For all other platforms we were using as a fallback  the 'pxo_board'
> clock (defined in the DT) rather than the 'pxo' (hackily injected by
> the gcc driver).
> I'd suggest following this pattern and using .fw_name = "pxo', .name =
> "pxo_board".

We were discussing this to the lcc driver. Problematic topic, yes will
follow the pattern just to not change things.

> 
> Same applies to the CXO clock.
> 
> > +};
> > +
> 
> 
> -- 
> With best wishes
> Dmitry

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