linux-kernel - [PATCH 02/23] clocksource/drivers/fttmr010: Fix the clock handling

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Date:   Wed, 14 Jun 2017 14:39:23 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonas Jensen <jonas.jensen@...il.com>
Subject: [PATCH 02/23] clocksource/drivers/fttmr010: Fix the clock handling

From: Linus Walleij <linus.walleij@...aro.org>

We need to also prepare and enable the clock we are using to get
the right reference count and avoid it being shut off.

Tested-by: Jonas Jensen <jonas.jensen@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-fttmr010.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-fttmr010.c b/drivers/clocksource/timer-fttmr010.c
index b4a6f1e..58ce017 100644
--- a/drivers/clocksource/timer-fttmr010.c
+++ b/drivers/clocksource/timer-fttmr010.c
@@ -238,12 +238,18 @@ static int __init fttmr010_timer_of_init(struct device_node *np)
 	 * and using EXTCLK is not supported in the driver.
 	 */
 	struct clk *clk;
+	int ret;
 
 	clk = of_clk_get_by_name(np, "PCLK");
 	if (IS_ERR(clk)) {
-		pr_err("could not get PCLK");
+		pr_err("could not get PCLK\n");
 		return PTR_ERR(clk);
 	}
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		pr_err("failed to enable PCLK\n");
+		return ret;
+	}
 	tick_rate = clk_get_rate(clk);
 
 	return fttmr010_timer_common_init(np);
-- 
2.7.4