linux-kernel - Re: [PATCH v3 1/3] thermal: sun8i: add thermal driver for h6

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Date:   Wed, 12 Jun 2019 17:43:25 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Frank Lee <tiny.windzz@...il.com>
Cc:     rui.zhang@...el.com, Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>, robh+dt@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        David Miller <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        paulmck@...ux.ibm.com, Linux PM <linux-pm@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] thermal: sun8i: add thermal driver for h6

On Fri, Jun 07, 2019 at 09:34:44PM +0800, Frank Lee wrote:
> On Mon, May 27, 2019 at 8:27 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> > > +     ret = devm_request_threaded_irq(dev, irq, NULL,
> > > +                                     tmdev->chip->irq_thread,
> > > +                                     IRQF_ONESHOT, "ths", tmdev);
> > > +     if (ret)
> > > +             return ret;
> >
> > Is there any particular reason to use a threaded interrupt?
>
> Just to improve real-time.

What do you mean by real-time here? If anything, that will increase
the latency of the interrupts here.

And in preempt-rt, regular top-half interrupts will be forced into a
threaded interrupt anyway.

> > > +static int sun8i_ths_remove(struct platform_device *pdev)
> > > +{
> > > +     struct ths_device *tmdev = platform_get_drvdata(pdev);
> > > +
> > > +     clk_disable_unprepare(tmdev->bus_clk);
> >
> > I know that we discussed that already, but I'm not sure why you switch
> > back to a regular call to regmap_init_mmio, while regmap_init_mmio_clk
> > will take care of enabling and disabling the bus clock for you?
>
> It seems that regmap_init_mmio_clk just get clk and prepare clk
> but no enable.

At init time, yes. But it will enable it only when you access the
registers, which is what you want anyway.

Maxime

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

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