u-boot/drivers/clk/clk.c
Peng Fan e6849e2fd8 clk: introduce enable_count
As what Linux Kernel 5.3.0 provides when enable/disable clk,
there is an enable_count in clk_core_disable/enable. Introduce
enable_count to track the clk enable/disable count when
clk_enable/disable for CCF. And Initialize enable_count to 0 when
register the clk.

And clk tree dump with enable_count will be supported, it will
be easy for us to check the clk status with enable_count

Signed-off-by: Peng Fan <peng.fan@nxp.com>
2019-08-22 00:10:09 +02:00

66 lines
1.4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 DENX Software Engineering
* Lukasz Majewski, DENX Software Engineering, lukma@denx.de
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm/device.h>
#include <dm/uclass.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#include <clk.h>
int clk_register(struct clk *clk, const char *drv_name,
const char *name, const char *parent_name)
{
struct udevice *parent;
struct driver *drv;
int ret;
ret = uclass_get_device_by_name(UCLASS_CLK, parent_name, &parent);
if (ret)
printf("%s: UCLASS parent: 0x%p\n", __func__, parent);
debug("%s: name: %s parent: %s [0x%p]\n", __func__, name, parent->name,
parent);
drv = lists_driver_lookup_name(drv_name);
if (!drv) {
printf("%s: %s is not a valid driver name\n",
__func__, drv_name);
return -ENOENT;
}
ret = device_bind(parent, drv, name, NULL, -1, &clk->dev);
if (ret) {
printf("%s: CLK: %s driver bind error [%d]!\n", __func__, name,
ret);
return ret;
}
clk->enable_count = 0;
/* Store back pointer to clk from udevice */
clk->dev->uclass_priv = clk;
return 0;
}
ulong clk_generic_get_rate(struct clk *clk)
{
return clk_get_parent_rate(clk);
}
const char *clk_hw_get_name(const struct clk *hw)
{
return hw->dev->name;
}
bool clk_dev_binded(struct clk *clk)
{
if (clk->dev && (clk->dev->flags & DM_FLAG_BOUND))
return true;
return false;
}