linux-kernel - [PATCH v3 1/7] rtc:rtc-at91rm9200:Use devm_clk_get

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Message-Id: <20240829121455.16854-2-liaoyuanhong@vivo.com>
Date: Thu, 29 Aug 2024 20:14:49 +0800
From: Liao Yuanhong <liaoyuanhong@...o.com>
To: alexandre.belloni@...tlin.com
Cc: linux-rtc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Liao Yuanhong <liaoyuanhong@...o.com>
Subject: [PATCH v3 1/7] rtc:rtc-at91rm9200:Use devm_clk_get_enabled() helpers

Use devm_clk_get_enabled() instead of clk functions in rtc-at91rm9200.

Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>
---
v2:remove the global sclk variable.
---
 drivers/rtc/rtc-at91rm9200.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index c16fe711a0d9..4d909b840515 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -104,7 +104,6 @@ static bool suspended;
 static DEFINE_SPINLOCK(suspended_lock);
 static unsigned long cached_events;
 static u32 at91_rtc_imr;
-static struct clk *sclk;
 
 static void at91_rtc_write_ier(u32 mask)
 {
@@ -471,6 +470,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 	struct rtc_device *rtc;
 	struct resource *regs;
 	int ret = 0;
+	struct clk *sclk;
 
 	at91_rtc_config = of_device_get_match_data(&pdev->dev);
 	if (!at91_rtc_config)
@@ -498,16 +498,10 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(rtc);
 	platform_set_drvdata(pdev, rtc);
 
-	sclk = devm_clk_get(&pdev->dev, NULL);
+	sclk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(sclk))
 		return PTR_ERR(sclk);
 
-	ret = clk_prepare_enable(sclk);
-	if (ret) {
-		dev_err(&pdev->dev, "Could not enable slow clock\n");
-		return ret;
-	}
-
 	at91_rtc_write(AT91_RTC_CR, 0);
 	at91_rtc_write(AT91_RTC_MR, at91_rtc_read(AT91_RTC_MR) & ~AT91_RTC_HRMOD);
 
@@ -521,7 +515,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 			       "at91_rtc", pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
-		goto err_clk;
+		return ret;
 	}
 
 	/* cpu init code should really have flagged this device as
@@ -539,7 +533,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 	rtc->range_max = RTC_TIMESTAMP_END_2099;
 	ret = devm_rtc_register_device(rtc);
 	if (ret)
-		goto err_clk;
+		return ret;
 
 	/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
 	 * completion.
@@ -548,11 +542,6 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 
 	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
 	return 0;
-
-err_clk:
-	clk_disable_unprepare(sclk);
-
-	return ret;
 }
 
 /*
@@ -564,8 +553,6 @@ static void __exit at91_rtc_remove(struct platform_device *pdev)
 	at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
 					AT91_RTC_SECEV | AT91_RTC_TIMEV |
 					AT91_RTC_CALEV);
-
-	clk_disable_unprepare(sclk);
 }
 
 static void at91_rtc_shutdown(struct platform_device *pdev)
-- 
2.25.1