[PATCH] rtc: at91sma9: Simplify using devm_clk_get_enabled()

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

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.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Hello,

this simplification depends on a patch set that introduces
devm_clk_get_prepared() and friends.

The most recent version of this patch set can be found at

	https://lore.kernel.org/r/20210301135053.1462168-1-u.kleine-koenig@pengutronix.de

Unfortunately I didn't get any feedback at all from the clk maintainers
on it, so I try to make other maintainers aware of it in the expectation
that the simplifications are welcome and so lure the clk maintainers to
share their thoughts.

Best regards
Uwe

 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