CLOCKSOURCE: mips-gic: Enable the clock before using it

For the clock to be used (e.g. get its rate through clk_get_rate)
it should be prepared and enabled first.

Also, while the clock is enabled the driver must hold a reference to it,
so let's remove the call to clk_put.

Reviewed-by: Andrew Bresticker <[email protected]>
Signed-off-by: Ezequiel Garcia <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: James Hartley <[email protected]>
Cc: Govindraj Raja <[email protected]>
Cc: Damien Horsley <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/10779/
Signed-off-by: Ralf Baechle <[email protected]>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index b81ed1a5342d..913585d93466 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -158,8 +158,13 @@ static void __init gic_clocksource_of_init(struct device_node *node)
 
 	clk = of_clk_get(node, 0);
 	if (!IS_ERR(clk)) {
+		if (clk_prepare_enable(clk) < 0) {
+			pr_err("GIC failed to enable clock\n");
+			clk_put(clk);
+			return;
+		}
+
 		gic_frequency = clk_get_rate(clk);
-		clk_put(clk);
 	} else if (of_property_read_u32(node, "clock-frequency",
 					&gic_frequency)) {
 		pr_err("GIC frequency not specified.\n");