From: "Clément Péron" <peron.clem@gmail.com>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
linux-pwm@vger.kernel.org,
Jernej Skrabec <jernej.skrabec@siol.net>,
devicetree <devicetree@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Maxime Ripard <mripard@kernel.org>,
Rob Herring <robh+dt@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
Thierry Reding <thierry.reding@gmail.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 2/7] pwm: sun4i: Add an optional probe for reset line
Date: Mon, 4 Nov 2019 18:50:04 +0100 [thread overview]
Message-ID: <CAJiuCcfEjE9qWqKyv5kyW_hTwO=L8eCuSoBEBvLZYm9JAV0O-w@mail.gmail.com> (raw)
In-Reply-To: <20191104081157.373v22atswsaktbe@pengutronix.de>
On Mon, 4 Nov 2019 at 09:11, Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
> Hello,
>
> adding Philipp Zabel (= reset controller maintainer) to Cc: and so I'm
> not stripping the uncommented parts of the patch.
>
> On Sun, Nov 03, 2019 at 09:33:29PM +0100, Clément Péron wrote:
> > From: Jernej Skrabec <jernej.skrabec@siol.net>
> >
> > H6 PWM core needs deasserted reset line in order to work.
> >
> > Add an optional probe for it.
> >
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > ---
> > drivers/pwm/pwm-sun4i.c | 32 ++++++++++++++++++++++++++++++--
> > 1 file changed, 30 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
> > index 6f5840a1a82d..d194b8ebdb00 100644
> > --- a/drivers/pwm/pwm-sun4i.c
> > +++ b/drivers/pwm/pwm-sun4i.c
> > @@ -16,6 +16,7 @@
> > #include <linux/of_device.h>
> > #include <linux/platform_device.h>
> > #include <linux/pwm.h>
> > +#include <linux/reset.h>
> > #include <linux/slab.h>
> > #include <linux/spinlock.h>
> > #include <linux/time.h>
> > @@ -78,6 +79,7 @@ struct sun4i_pwm_data {
> > struct sun4i_pwm_chip {
> > struct pwm_chip chip;
> > struct clk *clk;
> > + struct reset_control *rst;
> > void __iomem *base;
> > spinlock_t ctrl_lock;
> > const struct sun4i_pwm_data *data;
> > @@ -365,6 +367,20 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
> > if (IS_ERR(pwm->clk))
> > return PTR_ERR(pwm->clk);
> >
> > + pwm->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
> > + if (IS_ERR(pwm->rst)) {
> > + if (PTR_ERR(pwm->rst) == -EPROBE_DEFER)
> > + return PTR_ERR(pwm->rst);
> > + dev_info(&pdev->dev, "no reset control found\n");
>
> I would degrade this to a dev_dbg. Otherwise this spams the log for all
> unaffected machines. devm_reset_control_get_optional() is defined in a
> section that has a comment "These inline function calls will be removed
> once all consumers have been moved over to the new explicit API.", so I
> guess you want devm_reset_control_get_optional_exclusive or even
> devm_reset_control_get_optional_shared here.
Thanks for pointing this, I will change it.
>
> @Philipp: maybe a check in checkpatch that warns about introduction of
> such new instances would be good?!
>
> > + }
> > +
> > + /* Deassert reset */
> > + ret = reset_control_deassert(pwm->rst);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Cannot deassert reset control\n");
> > + return ret;
> > + }
> > +
> > pwm->chip.dev = &pdev->dev;
> > pwm->chip.ops = &sun4i_pwm_ops;
> > pwm->chip.base = -1;
> > @@ -377,19 +393,31 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
> > ret = pwmchip_add(&pwm->chip);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
> > - return ret;
> > + goto err_pwm_add;
> > }
> >
> > platform_set_drvdata(pdev, pwm);
> >
> > return 0;
> > +
> > +err_pwm_add:
> > + reset_control_assert(pwm->rst);
> > +
> > + return ret;
> > }
> >
> > static int sun4i_pwm_remove(struct platform_device *pdev)
> > {
> > struct sun4i_pwm_chip *pwm = platform_get_drvdata(pdev);
> > + int ret;
> > +
> > + ret = pwmchip_remove(&pwm->chip);
> > + if (ret)
> > + return ret;
> > +
> > + reset_control_assert(pwm->rst);
> >
> > - return pwmchip_remove(&pwm->chip);
> > + return 0;
> > }
> >
> > static struct platform_driver sun4i_pwm_driver = {
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K. | Uwe Kleine-König |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2019-11-04 17:50 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-03 20:33 [PATCH v2 0/7] Add support for H6 PWM Clément Péron
2019-11-03 20:33 ` [PATCH v2 1/7] dt-bindings: pwm: allwinner: Add H6 PWM description Clément Péron
2019-11-04 8:03 ` Uwe Kleine-König
2019-11-04 17:49 ` Clément Péron
2019-11-05 11:11 ` Maxime Ripard
2019-11-05 12:34 ` Clément Péron
2019-11-05 17:32 ` Maxime Ripard
2019-11-06 9:25 ` Clément Péron
2019-11-03 20:33 ` [PATCH v2 2/7] pwm: sun4i: Add an optional probe for reset line Clément Péron
2019-11-04 8:11 ` Uwe Kleine-König
2019-11-04 17:50 ` Clément Péron [this message]
2019-11-05 7:01 ` Philipp Zabel
2019-11-05 13:03 ` Clément Péron
2019-11-03 20:33 ` [PATCH v2 3/7] pwm: sun4i: Add an optional probe for bus clock Clément Péron
2019-11-04 8:24 ` Uwe Kleine-König
2019-11-04 18:07 ` Clément Péron
2019-11-04 20:10 ` Uwe Kleine-König
2019-11-04 20:19 ` Jernej Škrabec
2019-11-04 20:27 ` Clément Péron
2019-11-04 20:38 ` Jernej Škrabec
2019-11-03 20:33 ` [PATCH v2 4/7] pwm: sun4i: Add support to output source clock directly Clément Péron
2019-11-03 22:30 ` kbuild test robot
2019-11-03 22:41 ` Clément Péron
2019-11-03 22:58 ` kbuild test robot
2019-11-04 8:38 ` Uwe Kleine-König
2019-11-04 21:28 ` Clément Péron
2019-11-05 7:29 ` Uwe Kleine-König
2019-11-05 12:58 ` Clément Péron
2019-11-05 13:12 ` Uwe Kleine-König
2019-11-05 13:12 ` Clément Péron
2019-11-03 20:33 ` [PATCH v2 5/7] pwm: sun4i: Add support for H6 PWM Clément Péron
2019-11-03 20:33 ` [PATCH v2 6/7] arm64: dts: allwinner: h6: Add PWM node Clément Péron
2019-11-03 20:33 ` [PATCH v2 7/7] [DO NOT MERGE] arm64: allwinner: h6: enable Beelink GS1 PWM Clément Péron
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