fastboot: sparse: fix sparse blocks calculation

[oweals/u-boot.git] / include / clk.h

diff --git a/include/clk.h b/include/clk.h
index 941808a50e253a83dda83d8fecaaa01c5292d50b..ca20c3dd27c1c5de8a66c3049c6d042e2b05d433 100644 (file)
--- a/include/clk.h
+++ b/include/clk.h
@@ -8,6 +8,7 @@
 #ifndef _CLK_H_
 #define _CLK_H_
 
+#include <errno.h>
 #include <linux/types.h>
 
 struct udevice;
@@ -105,4 +106,27 @@ ulong clk_get_periph_rate(struct udevice *dev, int periph);
  */
 ulong clk_set_periph_rate(struct udevice *dev, int periph, ulong rate);
 
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+/**
+ * clk_get_by_index() - look up a clock referenced by a device
+ *
+ * Parse a device's 'clocks' list, returning information on the indexed clock,
+ * ensuring that it is activated.
+ *
+ * @dev:       Device containing the clock reference
+ * @index:     Clock index to return (0 = first)
+ * @clk_devp:  Returns clock device
+ * @return:    Peripheral ID for the device to control. This is the first
+ *             argument after the clock node phandle. If there is no arguemnt,
+ *             returns 0. Return -ve error code on any error
+ */
+int clk_get_by_index(struct udevice *dev, int index, struct udevice **clk_devp);
+#else
+static inline int clk_get_by_index(struct udevice *dev, int index,
+                                  struct udevice **clk_devp)
+{
+       return -ENOSYS;
+}
+#endif
+
 #endif /* _CLK_H_ */