1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * OMAP2-specific DPLL control functions
4  *
5  * Copyright (C) 2011 Nokia Corporation
6  * Paul Walmsley
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/clk.h>
12 #include <linux/io.h>
13 
14 #include "clock.h"
15 #include "cm2xxx.h"
16 #include "cm-regbits-24xx.h"
17 
18 /* Private functions */
19 
20 /**
21  * _allow_idle - enable DPLL autoidle bits
22  * @clk: struct clk * of the DPLL to operate on
23  *
24  * Enable DPLL automatic idle control.  The DPLL will enter low-power
25  * stop when its downstream clocks are gated.  No return value.
26  * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
27  * instead.  Add some mechanism to optionally enter this mode.
28  */
29 static void _allow_idle(struct clk_hw_omap *clk)
30 {
31 	if (!clk || !clk->dpll_data)
32 		return;
33 
34 	omap2xxx_cm_set_dpll_auto_low_power_stop();
35 }
36 
37 /**
38  * _deny_idle - prevent DPLL from automatically idling
39  * @clk: struct clk * of the DPLL to operate on
40  *
41  * Disable DPLL automatic idle control.  No return value.
42  */
43 static void _deny_idle(struct clk_hw_omap *clk)
44 {
45 	if (!clk || !clk->dpll_data)
46 		return;
47 
48 	omap2xxx_cm_set_dpll_disable_autoidle();
49 }
50 
51 
52 /* Public data */
53 const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
54 	.allow_idle	= _allow_idle,
55 	.deny_idle	= _deny_idle,
56 };
57