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
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