linux-kernel - [PATCH] drivers: rtc: fix s3c-rtc initialization failure without rtc source clock

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Message-id: <1413372446-28541-1-git-send-email-m.szyprowski@samsung.com>
Date:	Wed, 15 Oct 2014 13:27:26 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: [PATCH] drivers: rtc: fix s3c-rtc initialization failure without rtc
 source clock

This patch fixes unconditional initialization failure on non-exynos3250
SoCs. Commit df9e26d093d33a097c5558aab017dd2f540ccfe5 ("rtc: s3c: add support for RTC of Exynos3250 SoC") introduced rtc source clock support,
but also added initialization failure on SoCs, which doesn't need such
clock.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/rtc/rtc-s3c.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index a6b1252c9941..806072238c00 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -535,13 +535,15 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 	}
 	clk_prepare_enable(info->rtc_clk);
 
-	info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
-	if (IS_ERR(info->rtc_src_clk)) {
-		dev_err(&pdev->dev, "failed to find rtc source clock\n");
-		return PTR_ERR(info->rtc_src_clk);
+	if (info->data->needs_src_clk) {
+		info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
+		if (IS_ERR(info->rtc_src_clk)) {
+			dev_err(&pdev->dev,
+				"failed to find rtc source clock\n");
+			return PTR_ERR(info->rtc_src_clk);
+		}
+		clk_prepare_enable(info->rtc_src_clk);
 	}
-	clk_prepare_enable(info->rtc_src_clk);
-
 
 	/* check to see if everything is setup correctly */
 	if (info->data->enable)
-- 
1.9.2

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