arch/arm/mach-omap2/clkt2xxx_dpll.c

   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 };