arch/arm/mach-omap2/clkt2xxx_dpll.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/clkt2xxx_dpll.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/clkt2xxx_dpll.c
Extension
.c
Size
1290 bytes
Lines
57
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP2-specific DPLL control functions
 *
 * Copyright (C) 2011 Nokia Corporation
 * Paul Walmsley
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/io.h>

#include "clock.h"
#include "cm2xxx.h"
#include "cm-regbits-24xx.h"

/* Private functions */

/**
 * _allow_idle - enable DPLL autoidle bits
 * @clk: struct clk * of the DPLL to operate on
 *
 * Enable DPLL automatic idle control.  The DPLL will enter low-power
 * stop when its downstream clocks are gated.  No return value.
 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
 * instead.  Add some mechanism to optionally enter this mode.
 */
static void _allow_idle(struct clk_hw_omap *clk)
{
	if (!clk || !clk->dpll_data)
		return;

	omap2xxx_cm_set_dpll_auto_low_power_stop();
}

/**
 * _deny_idle - prevent DPLL from automatically idling
 * @clk: struct clk * of the DPLL to operate on
 *
 * Disable DPLL automatic idle control.  No return value.
 */
static void _deny_idle(struct clk_hw_omap *clk)
{
	if (!clk || !clk->dpll_data)
		return;

	omap2xxx_cm_set_dpll_disable_autoidle();
}


/* Public data */
const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
	.allow_idle	= _allow_idle,
	.deny_idle	= _deny_idle,
};

Annotation

Implementation Notes