misc: atmel_tclib: get and use slow clock

Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.

Get and use the slow clock as it is necessary for the timer counters.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index 0ca05c3ec8d6..ac24a4bd63f7 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -125,6 +125,10 @@ static int __init tc_probe(struct platform_device *pdev)
         if (IS_ERR(clk))
                 return PTR_ERR(clk);
 
+        tc->slow_clk = devm_clk_get(&pdev->dev, "slow_clk");
+        if (IS_ERR(tc->slow_clk))
+                return PTR_ERR(tc->slow_clk);
+
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         tc->regs = devm_ioremap_resource(&pdev->dev, r);
         if (IS_ERR(tc->regs))