From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Jernej Skrabec <jernej.skrabec@siol.net>
Cc: thierry.reding@gmail.com, mripard@kernel.org, wens@csie.org,
robh+dt@kernel.org, mark.rutland@arm.com,
linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
Philipp Zabel <p.zabel@pengutronix.de>
Subject: Re: [PATCH 2/6] pwm: sun4i: Add a quirk for reset line
Date: Mon, 29 Jul 2019 08:36:30 +0200 [thread overview]
Message-ID: <20190729063630.rn325whatfnc3m7n@pengutronix.de> (raw)
In-Reply-To: <20190726184045.14669-3-jernej.skrabec@siol.net>
Cc += reset framework maintainer
Hello Jernej,
On Fri, Jul 26, 2019 at 08:40:41PM +0200, Jernej Skrabec wrote:
> H6 PWM core needs deasserted reset line in order to work.
>
> Add a quirk for it.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> ---
> drivers/pwm/pwm-sun4i.c | 27 +++++++++++++++++++++++++--
> 1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
> index de78c824bbfd..1b7be8fbde86 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>
> @@ -72,12 +73,14 @@ static const u32 prescaler_table[] = {
>
> struct sun4i_pwm_data {
> bool has_prescaler_bypass;
> + bool has_reset;
> unsigned int npwm;
> };
>
> 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;
> @@ -371,6 +374,14 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
> if (IS_ERR(pwm->clk))
> return PTR_ERR(pwm->clk);
>
> + if (pwm->data->has_reset) {
> + pwm->rst = devm_reset_control_get(&pdev->dev, NULL);
> + if (IS_ERR(pwm->rst))
> + return PTR_ERR(pwm->rst);
> +
> + reset_control_deassert(pwm->rst);
> + }
> +
I wonder why there is a need to track if a given chip needs a reset
line. I'd just use devm_reset_control_get_optional() and drop the
.has_reset member in struct sun4i_pwm_data.
> pwm->chip.dev = &pdev->dev;
> pwm->chip.ops = &sun4i_pwm_ops;
> pwm->chip.base = -1;
> @@ -383,19 +394,31 @@ 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;
>
> - return pwmchip_remove(&pwm->chip);
> + reset_control_assert(pwm->rst);
> +
> + return 0;
> }
>
> static struct platform_driver sun4i_pwm_driver = {
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2019-07-29 6:36 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-26 18:40 [PATCH 0/6] pwm: sun4i: Add support for Allwinner H6 Jernej Skrabec
2019-07-26 18:40 ` [PATCH 1/6] dt-bindings: pwm: allwinner: Add H6 PWM description Jernej Skrabec
2019-07-27 10:42 ` Maxime Ripard
2019-07-26 18:40 ` [PATCH 2/6] pwm: sun4i: Add a quirk for reset line Jernej Skrabec
2019-07-27 10:42 ` Maxime Ripard
2019-07-29 6:36 ` Uwe Kleine-König [this message]
2019-07-29 6:43 ` Chen-Yu Tsai
2019-07-29 7:12 ` Uwe Kleine-König
2019-07-29 10:18 ` Philipp Zabel
2019-07-29 16:37 ` Maxime Ripard
2019-07-29 18:20 ` Uwe Kleine-König
2019-07-26 18:40 ` [PATCH 3/6] pwm: sun4i: Add a quirk for bus clock Jernej Skrabec
2019-07-27 10:46 ` Maxime Ripard
2019-07-27 14:15 ` Jernej Škrabec
2019-07-27 14:27 ` Chen-Yu Tsai
2019-07-29 6:38 ` Uwe Kleine-König
2019-07-29 15:48 ` Jernej Škrabec
2019-07-29 16:14 ` Uwe Kleine-König
2019-07-29 16:45 ` Maxime Ripard
2019-07-29 19:04 ` Uwe Kleine-König
2019-07-26 18:40 ` [PATCH 4/6] pwm: sun4i: Add support for H6 PWM Jernej Skrabec
2019-07-29 6:40 ` Uwe Kleine-König
2019-07-29 15:55 ` Jernej Škrabec
2019-07-29 16:07 ` Uwe Kleine-König
2019-07-29 16:09 ` [linux-sunxi] " Chen-Yu Tsai
2019-07-29 16:24 ` Uwe Kleine-König
2019-07-29 16:40 ` Jernej Škrabec
2019-07-29 18:40 ` Uwe Kleine-König
2019-07-29 18:46 ` Jernej Škrabec
2019-07-29 18:51 ` Uwe Kleine-König
2019-07-29 22:04 ` Jernej Škrabec
2019-07-30 8:09 ` Uwe Kleine-König
2019-07-30 8:32 ` Chen-Yu Tsai
2019-07-30 17:06 ` Maxime Ripard
2019-07-31 6:52 ` Uwe Kleine-König
2019-08-12 9:56 ` Maxime Ripard
2019-08-12 10:47 ` Uwe Kleine-König
2019-08-12 10:51 ` Jernej Škrabec
2019-07-26 18:40 ` [PATCH 5/6] pwm: sun4i: Add support to output source clock directly Jernej Skrabec
2019-07-27 10:50 ` Maxime Ripard
2019-07-27 14:28 ` Jernej Škrabec
2019-07-27 14:54 ` [linux-sunxi] " Chen-Yu Tsai
2019-07-29 7:06 ` Uwe Kleine-König
2019-07-29 16:16 ` Jernej Škrabec
2019-07-29 16:29 ` Uwe Kleine-König
2019-07-26 18:40 ` [PATCH 6/6] arm64: dts: allwinner: h6: Add PWM node Jernej Skrabec
2019-07-27 10:51 ` Maxime Ripard
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