mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
ec8f1c02dd
This check requires the struct clk passed to .get_rate() to be always cleared out as any clock with valid ID causes -EINVAL return value. The return code of fixed clocks shall always be returned. Signed-off-by: Lukasz Majewski <lukma@denx.de> Reviewed-by: Peng Fan <peng.fan@nxp.com>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
|
|
*
|
|
* Author: Anup Patel <anup.patel@wdc.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk-uclass.h>
|
|
#include <div64.h>
|
|
#include <dm.h>
|
|
|
|
struct clk_fixed_factor {
|
|
struct clk parent;
|
|
unsigned int div;
|
|
unsigned int mult;
|
|
};
|
|
|
|
#define to_clk_fixed_factor(dev) \
|
|
((struct clk_fixed_factor *)dev_get_platdata(dev))
|
|
|
|
static ulong clk_fixed_factor_get_rate(struct clk *clk)
|
|
{
|
|
uint64_t rate;
|
|
struct clk_fixed_factor *ff = to_clk_fixed_factor(clk->dev);
|
|
|
|
rate = clk_get_rate(&ff->parent);
|
|
if (IS_ERR_VALUE(rate))
|
|
return rate;
|
|
|
|
do_div(rate, ff->div);
|
|
|
|
return rate * ff->mult;
|
|
}
|
|
|
|
const struct clk_ops clk_fixed_factor_ops = {
|
|
.get_rate = clk_fixed_factor_get_rate,
|
|
};
|
|
|
|
static int clk_fixed_factor_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
|
|
int err;
|
|
struct clk_fixed_factor *ff = to_clk_fixed_factor(dev);
|
|
|
|
err = clk_get_by_index(dev, 0, &ff->parent);
|
|
if (err)
|
|
return err;
|
|
|
|
ff->div = dev_read_u32_default(dev, "clock-div", 1);
|
|
ff->mult = dev_read_u32_default(dev, "clock-mult", 1);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id clk_fixed_factor_match[] = {
|
|
{
|
|
.compatible = "fixed-factor-clock",
|
|
},
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(clk_fixed_factor) = {
|
|
.name = "fixed_factor_clock",
|
|
.id = UCLASS_CLK,
|
|
.of_match = clk_fixed_factor_match,
|
|
.ofdata_to_platdata = clk_fixed_factor_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct clk_fixed_factor),
|
|
.ops = &clk_fixed_factor_ops,
|
|
};
|