From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: Fabrice Gasnier <fabrice.gasnier@st.com>, jic23@kernel.org
Cc: alexandre.torgue@st.com, mcoquelin.stm32@gmail.com,
benjamin.gaignard@st.com, linux-iio@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] counter: stm32-timer-cnt: add power management support
Date: Wed, 5 Feb 2020 12:59:45 -0500 [thread overview]
Message-ID: <20200205175945.GA57132@icarus> (raw)
In-Reply-To: <1580899678-26393-1-git-send-email-fabrice.gasnier@st.com>
On Wed, Feb 05, 2020 at 11:47:58AM +0100, Fabrice Gasnier wrote:
> Add suspend/resume PM sleep ops. When going to low power, enforce the
> counter isn't active.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
These changes are purely for the PM ops and don't involve the Counter
API, so I don't see any see any issues with this patch from my end.
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> ---
> drivers/counter/stm32-timer-cnt.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index 3eafcce..3b84503 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -12,6 +12,7 @@
> #include <linux/iio/types.h>
> #include <linux/mfd/stm32-timers.h>
> #include <linux/module.h>
> +#include <linux/pinctrl/consumer.h>
> #include <linux/platform_device.h>
>
> #define TIM_CCMR_CCXS (BIT(8) | BIT(0))
> @@ -358,10 +359,33 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev)
> priv->counter.num_signals = ARRAY_SIZE(stm32_signals);
> priv->counter.priv = priv;
>
> + platform_set_drvdata(pdev, priv);
> +
> /* Register Counter device */
> return devm_counter_register(dev, &priv->counter);
> }
>
> +static int __maybe_unused stm32_timer_cnt_suspend(struct device *dev)
> +{
> + struct stm32_timer_cnt *priv = dev_get_drvdata(dev);
> + u32 cr1;
> +
> + /* Check for active counter */
> + regmap_read(priv->regmap, TIM_CR1, &cr1);
> + if (cr1 & TIM_CR1_CEN)
> + return -EBUSY;
> +
> + return pinctrl_pm_select_sleep_state(dev);
> +}
> +
> +static int __maybe_unused stm32_timer_cnt_resume(struct device *dev)
> +{
> + return pinctrl_pm_select_default_state(dev);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(stm32_timer_cnt_pm_ops, stm32_timer_cnt_suspend,
> + stm32_timer_cnt_resume);
> +
> static const struct of_device_id stm32_timer_cnt_of_match[] = {
> { .compatible = "st,stm32-timer-counter", },
> {},
> @@ -373,6 +397,7 @@ static struct platform_driver stm32_timer_cnt_driver = {
> .driver = {
> .name = "stm32-timer-counter",
> .of_match_table = stm32_timer_cnt_of_match,
> + .pm = &stm32_timer_cnt_pm_ops,
> },
> };
> module_platform_driver(stm32_timer_cnt_driver);
> --
> 2.7.4
>
next prev parent reply other threads:[~2020-02-05 18:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-05 10:47 [PATCH] counter: stm32-timer-cnt: add power management support Fabrice Gasnier
2020-02-05 17:59 ` William Breathitt Gray [this message]
2020-02-08 15:35 ` Jonathan Cameron
2020-02-10 17:13 ` Fabrice Gasnier
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