[U-Boot] [RFC PATCH 5/6] clk: add enable() callback

[Masahiro Yamada]

The most basic thing for clock is to enable it, but it is missing
in this uclass.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---

 include/clk.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/clk.h b/include/clk.h
index 518cb47..ce2db41 100644
--- a/include/clk.h
+++ b/include/clk.h
@@ -33,6 +33,15 @@ struct clk_ops {
 	ulong (*set_rate)(struct udevice *dev, ulong rate);
 
 	/**
+	 * enable() - Enable the clock for a peripheral
+	 *
+	 * @dev:	clock provider
+	 * @periph:	Peripheral ID to enable
+	 * @return zero on success, or -ve error code
+	 */
+	int (*enable)(struct udevice *dev, int periph);
+
+	/**
 	 * get_periph_rate() - Get clock rate for a peripheral
 	 *
 	 * @dev:	Device to check (UCLASS_CLK)
-- 
1.9.1