linux-kernel - Re: [PATCH v4 08/11] thermal: sun8i: support ahb clocks

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Message-ID: <20190625082507.mgycs6rzlxpvgqgu@flea>
Date:   Tue, 25 Jun 2019 10:25:07 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Yangtao Li <tiny.windzz@...il.com>, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        gregkh@...uxfoundation.org, linus.walleij@...aro.org,
        daniel.lezcano@...aro.org, linux-kernel@...r.kernel.org,
        edubezval@...il.com, wens@...e.org, robh+dt@...nel.org,
        mchehab+samsung@...nel.org, rui.zhang@...el.com,
        paulmck@...ux.ibm.com, davem@...emloft.net,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 08/11] thermal: sun8i: support ahb clocks

On Tue, Jun 25, 2019 at 02:34:16AM +0200, Ondřej Jirman wrote:
> On Mon, Jun 24, 2019 at 08:23:33PM +0200, Maxime Ripard wrote:
> > On Sun, Jun 23, 2019 at 12:42:03PM -0400, Yangtao Li wrote:
> > > H3 has extra clock, so introduce something in ths_thermal_chip/ths_device
> > > and adds the process of the clock.
> > >
> > > This is pre-work for supprt it.
> > >
> > > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > > ---
> > >  drivers/thermal/sun8i_thermal.c | 17 ++++++++++++++++-
> > >  1 file changed, 16 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> > > index ed1c19bb27cf..04f53ffb6a14 100644
> > > --- a/drivers/thermal/sun8i_thermal.c
> > > +++ b/drivers/thermal/sun8i_thermal.c
> > > @@ -54,6 +54,7 @@ struct tsensor {
> > >  };
> > >
> > >  struct ths_thermal_chip {
> > > +	bool            has_ahb_clk;
> > >  	int		sensor_num;
> > >  	int		offset;
> > >  	int		scale;
> > > @@ -69,6 +70,7 @@ struct ths_device {
> > >  	struct regmap				*regmap;
> > >  	struct reset_control			*reset;
> > >  	struct clk				*bus_clk;
> > > +	struct clk                              *ahb_clk;
> >
> > Hmm, thinking a bit about this, the name of those two clocks doesn't
> > make sense. AHB is the bus being used to access that device, so the
> > bus clock is the AHB clock.
> >
> > What is that clock being used for?
>
> To control the A/D and sample averaging logic, I suppose. It's controlled by the
> THS_CLK_REG (THS Clock Register) in H3 user manual.
>
> bus_clk controls THS_GATING in BUS_CLK_GATING_REG2 (THS module is connected to
> APB bus).
>
> I'd call it ths_clk and bus_clk.

Thanks. We've tried to make clock names a bit more generic and
consistent, so let's use mod instead.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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