LXR linux/arch/arm/mach-omap2/clkt2xxx

   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 */
  29static 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 */
  43static 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 */
  53const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
  54        .allow_idle     = _allow_idle,
  55        .deny_idle      = _deny_idle,
  56};
  57