clk: mediatek: add support to configure clock driver parent
[platform/kernel/u-boot.git] / drivers / clk / clk-fixed-factor.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2019 DENX Software Engineering
4  * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
5  *
6  * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
7  */
8
9 #define LOG_CATEGORY UCLASS_CLK
10
11 #include <common.h>
12 #include <clk.h>
13 #include <clk-uclass.h>
14 #include <div64.h>
15 #include <log.h>
16 #include <malloc.h>
17 #include <dm/device.h>
18 #include <dm/devres.h>
19 #include <linux/clk-provider.h>
20 #include <linux/err.h>
21
22 #include "clk.h"
23
24 #define UBOOT_DM_CLK_IMX_FIXED_FACTOR "ccf_clk_fixed_factor"
25
26 static ulong clk_factor_recalc_rate(struct clk *clk)
27 {
28         struct clk_fixed_factor *fix = to_clk_fixed_factor(clk);
29         unsigned long parent_rate = clk_get_parent_rate(clk);
30         unsigned long long int rate;
31
32         rate = (unsigned long long int)parent_rate * fix->mult;
33         do_div(rate, fix->div);
34         return (ulong)rate;
35 }
36
37 const struct clk_ops ccf_clk_fixed_factor_ops = {
38         .get_rate = clk_factor_recalc_rate,
39 };
40
41 struct clk *clk_hw_register_fixed_factor(struct device *dev,
42                 const char *name, const char *parent_name, unsigned long flags,
43                 unsigned int mult, unsigned int div)
44 {
45         struct clk_fixed_factor *fix;
46         struct clk *clk;
47         int ret;
48
49         fix = kzalloc(sizeof(*fix), GFP_KERNEL);
50         if (!fix)
51                 return ERR_PTR(-ENOMEM);
52
53         /* struct clk_fixed_factor assignments */
54         fix->mult = mult;
55         fix->div = div;
56         clk = &fix->clk;
57         clk->flags = flags;
58
59         ret = clk_register(clk, UBOOT_DM_CLK_IMX_FIXED_FACTOR, name,
60                            parent_name);
61         if (ret) {
62                 kfree(fix);
63                 return ERR_PTR(ret);
64         }
65
66         return clk;
67 }
68
69 struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
70                 const char *parent_name, unsigned long flags,
71                 unsigned int mult, unsigned int div)
72 {
73         struct clk *clk;
74
75         clk = clk_hw_register_fixed_factor(dev, name, parent_name, flags, mult,
76                                           div);
77         if (IS_ERR(clk))
78                 return ERR_CAST(clk);
79         return clk;
80 }
81
82 U_BOOT_DRIVER(imx_clk_fixed_factor) = {
83         .name   = UBOOT_DM_CLK_IMX_FIXED_FACTOR,
84         .id     = UCLASS_CLK,
85         .ops    = &ccf_clk_fixed_factor_ops,
86         .flags = DM_FLAG_PRE_RELOC,
87 };