https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: bf05bf16c76bb44ab5156223e1e58e26dfe30a88 authored by Linus Torvalds on 18 April 2021, 21:45:32 UTC
Linux 5.12-rc8
Linux 5.12-rc8
Tip revision: bf05bf1
clk-cpu.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014 Lucas Stach <l.stach@pengutronix.de>, Pengutronix
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/export.h>
#include <linux/slab.h>
#include "clk.h"
struct clk_cpu {
struct clk_hw hw;
struct clk *div;
struct clk *mux;
struct clk *pll;
struct clk *step;
};
static inline struct clk_cpu *to_clk_cpu(struct clk_hw *hw)
{
return container_of(hw, struct clk_cpu, hw);
}
static unsigned long clk_cpu_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_cpu *cpu = to_clk_cpu(hw);
return clk_get_rate(cpu->div);
}
static long clk_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct clk_cpu *cpu = to_clk_cpu(hw);
return clk_round_rate(cpu->pll, rate);
}
static int clk_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_cpu *cpu = to_clk_cpu(hw);
int ret;
/* switch to PLL bypass clock */
ret = clk_set_parent(cpu->mux, cpu->step);
if (ret)
return ret;
/* reprogram PLL */
ret = clk_set_rate(cpu->pll, rate);
if (ret) {
clk_set_parent(cpu->mux, cpu->pll);
return ret;
}
/* switch back to PLL clock */
clk_set_parent(cpu->mux, cpu->pll);
/* Ensure the divider is what we expect */
clk_set_rate(cpu->div, rate);
return 0;
}
static const struct clk_ops clk_cpu_ops = {
.recalc_rate = clk_cpu_recalc_rate,
.round_rate = clk_cpu_round_rate,
.set_rate = clk_cpu_set_rate,
};
struct clk_hw *imx_clk_hw_cpu(const char *name, const char *parent_name,
struct clk *div, struct clk *mux, struct clk *pll,
struct clk *step)
{
struct clk_cpu *cpu;
struct clk_hw *hw;
struct clk_init_data init;
int ret;
cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
if (!cpu)
return ERR_PTR(-ENOMEM);
cpu->div = div;
cpu->mux = mux;
cpu->pll = pll;
cpu->step = step;
init.name = name;
init.ops = &clk_cpu_ops;
init.flags = CLK_IS_CRITICAL;
init.parent_names = &parent_name;
init.num_parents = 1;
cpu->hw.init = &init;
hw = &cpu->hw;
ret = clk_hw_register(NULL, hw);
if (ret) {
kfree(cpu);
return ERR_PTR(ret);
}
return hw;
}
EXPORT_SYMBOL_GPL(imx_clk_hw_cpu);