Re: [PATCH v5 4/6] rtc: at91sma9: Simplify using devm_clk_get_enabled()

From: Alexander Dahl <ada@thorsis.com>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kernel@pengutronix.de, linux-rtc@vger.kernel.org
Subject: Re: [PATCH v5 4/6] rtc: at91sma9: Simplify using devm_clk_get_enabled()
Date: Thu, 22 Apr 2021 10:01:25 +0200	[thread overview]
Message-ID: <YIEtVVE8ZdwbTTgM@ada-deb-carambola.ifak-system.com> (raw)
In-Reply-To: <20210422065726.1646742-5-u.kleine-koenig@pengutronix.de>

Hello Uwe,

I think there's a typo in the subject.  It should be sam9 instead of
sma9, right?

Greets
Alex

Am Thu, Apr 22, 2021 at 08:57:24AM +0200 schrieb Uwe Kleine-König:
> devm_clk_get_enabled() returns the clk already (prepared and) enabled
> and the automatically called cleanup cares for disabling (and
> unpreparing). So simplify .probe() and .remove() accordingly.
> 
> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/rtc/rtc-at91sam9.c | 22 ++++------------------
>  1 file changed, 4 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index 2216be429ab7..b52e7bd26303 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -374,21 +374,14 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	}
>  
> -	rtc->sclk = devm_clk_get(&pdev->dev, NULL);
> +	rtc->sclk = devm_clk_get_enabled(&pdev->dev, NULL);
>  	if (IS_ERR(rtc->sclk))
>  		return PTR_ERR(rtc->sclk);
>  
> -	ret = clk_prepare_enable(rtc->sclk);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Could not enable slow clock\n");
> -		return ret;
> -	}
> -
>  	sclk_rate = clk_get_rate(rtc->sclk);
>  	if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {
>  		dev_err(&pdev->dev, "Invalid slow clock rate\n");
> -		ret = -EINVAL;
> -		goto err_clk;
> +		return -EINVAL;
>  	}
>  
>  	mr = rtt_readl(rtc, MR);
> @@ -406,7 +399,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  	rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);
>  	if (IS_ERR(rtc->rtcdev)) {
>  		ret = PTR_ERR(rtc->rtcdev);
> -		goto err_clk;
> +		return ret;
>  	}
>  
>  	rtc->rtcdev->ops = &at91_rtc_ops;
> @@ -418,7 +411,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  			       dev_name(&rtc->rtcdev->dev), rtc);
>  	if (ret) {
>  		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
> -		goto err_clk;
> +		return ret;
>  	}
>  
>  	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
> @@ -432,11 +425,6 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  			 dev_name(&rtc->rtcdev->dev));
>  
>  	return devm_rtc_register_device(rtc->rtcdev);
> -
> -err_clk:
> -	clk_disable_unprepare(rtc->sclk);
> -
> -	return ret;
>  }
>  
>  /*
> @@ -450,8 +438,6 @@ static int at91_rtc_remove(struct platform_device *pdev)
>  	/* disable all interrupts */
>  	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
>  
> -	clk_disable_unprepare(rtc->sclk);
> -
>  	return 0;
>  }
>  
> -- 
> 2.30.2
> 
> 
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