xref: /openbmc/u-boot/board/synopsys/hsdk/clk-lib.h (revision e8f80a5a)
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
4  * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
5  */
6 
7 #ifndef __BOARD_CLK_LIB_H
8 #define __BOARD_CLK_LIB_H
9 
10 #include <common.h>
11 
12 enum clk_ctl_ops {
13 	CLK_SET		= BIT(0), /* set frequency */
14 	CLK_GET		= BIT(1), /* get frequency */
15 	CLK_ON		= BIT(2), /* enable clock */
16 	CLK_OFF		= BIT(3), /* disable clock */
17 	CLK_PRINT	= BIT(4), /* print frequency */
18 	CLK_MHZ		= BIT(5)  /* all values in MHZ instead of HZ */
19 };
20 
21 /*
22  * Depending on the clk_ctl_ops enable / disable /
23  * set clock rate from 'rate' argument / read clock to 'rate' argument /
24  * print clock rate. If CLK_MHZ flag set in clk_ctl_ops 'rate' is in MHz,
25  * otherwise - in Hz.
26  *
27  * This function expects "clk-fmeas" node in device tree:
28  * / {
29  *	clk-fmeas {
30  *		clocks = <&cpu_pll>, <&sys_pll>;
31  *		clock-names = "cpu-pll", "sys-pll";
32  *	};
33  * };
34  */
35 int soc_clk_ctl(const char *name, ulong *rate, enum clk_ctl_ops ctl);
36 
37 #endif /* __BOARD_CLK_LIB_H */
38