+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
#ifndef _CLK_H_
#define _CLK_H_
+#include <errno.h>
+#include <linux/types.h>
+
+struct udevice;
+
int soc_clk_dump(void);
+struct clk_ops {
+ /**
+ * get_rate() - Get current clock rate
+ *
+ * @dev: Device to check (UCLASS_CLK)
+ * @return clock rate in Hz, or -ve error code
+ */
+ ulong (*get_rate)(struct udevice *dev);
+
+ /**
+ * set_rate() - Set current clock rate
+ *
+ * @dev: Device to adjust
+ * @rate: New clock rate in Hz
+ * @return new rate, or -ve error code
+ */
+ 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)
+ * @periph: Peripheral ID to check
+ * @return clock rate in Hz, or -ve error code
+ */
+ ulong (*get_periph_rate)(struct udevice *dev, int periph);
+
+ /**
+ * set_periph_rate() - Set current clock rate for a peripheral
+ *
+ * @dev: Device to update (UCLASS_CLK)
+ * @periph: Peripheral ID to update
+ * @return new clock rate in Hz, or -ve error code
+ */
+ ulong (*set_periph_rate)(struct udevice *dev, int periph, ulong rate);
+};
+
+#define clk_get_ops(dev) ((struct clk_ops *)(dev)->driver->ops)
+
+/**
+ * clk_get_rate() - Get current clock rate
+ *
+ * @dev: Device to check (UCLASS_CLK)
+ * @return clock rate in Hz, or -ve error code
+ */
+ulong clk_get_rate(struct udevice *dev);
+
+/**
+ * clk_set_rate() - Set current clock rate
+ *
+ * @dev: Device to adjust
+ * @rate: New clock rate in Hz
+ * @return new rate, or -ve error code
+ */
+ulong clk_set_rate(struct udevice *dev, ulong rate);
+
+/**
+ * clk_enable() - Enable the clock for a peripheral
+ *
+ * @dev: clock provider
+ * @periph: Peripheral ID to enable
+ * @return zero on success, or -ve error code
+ */
+int clk_enable(struct udevice *dev, int periph);
+
+/**
+ * clk_get_periph_rate() - Get current clock rate for a peripheral
+ *
+ * @dev: Device to check (UCLASS_CLK)
+ * @return clock rate in Hz, -ve error code
+ */
+ulong clk_get_periph_rate(struct udevice *dev, int periph);
+
+/**
+ * clk_set_periph_rate() - Set current clock rate for a peripheral
+ *
+ * @dev: Device to update (UCLASS_CLK)
+ * @periph: Peripheral ID to update
+ * @return new clock rate in Hz, or -ve error code
+ */
+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_ */