1 // SPDX-License-Identifier: MIT
3 * clock framework for AMD Stoney based clocks
5 * Copyright 2018 Advanced Micro Devices, Inc.
9 #include <linux/clkdev.h>
10 #include <linux/clk-provider.h>
11 #include <linux/platform_data/clk-fch.h>
12 #include <linux/platform_device.h>
14 /* Clock Driving Strength 2 register */
15 #define CLKDRVSTR2 0x28
16 /* Clock Control 1 register */
17 #define MISCCLKCNTL1 0x40
18 /* Auxiliary clock1 enable bit */
20 /* 25Mhz auxiliary output clock freq bit */
21 #define OSCOUT1CLK25MHZ 16
33 static const char * const clk_oscout1_parents[] = { "clk48MHz", "clk25MHz" };
34 static struct clk_hw *hws[ST_MAX_CLKS];
36 static int fch_clk_probe(struct platform_device *pdev)
38 struct fch_clk_data *fch_data;
40 fch_data = dev_get_platdata(&pdev->dev);
41 if (!fch_data || !fch_data->base)
44 if (!fch_data->is_rv) {
45 hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
47 hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz",
50 hws[ST_CLK_MUX] = clk_hw_register_mux(NULL, "oscout1_mux",
51 clk_oscout1_parents, ARRAY_SIZE(clk_oscout1_parents),
52 0, fch_data->base + CLKDRVSTR2, OSCOUT1CLK25MHZ, 3, 0,
55 clk_set_parent(hws[ST_CLK_MUX]->clk, hws[ST_CLK_48M]->clk);
57 hws[ST_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1",
58 "oscout1_mux", 0, fch_data->base + MISCCLKCNTL1,
59 OSCCLKENB, CLK_GATE_SET_TO_DISABLE, NULL);
61 devm_clk_hw_register_clkdev(&pdev->dev, hws[ST_CLK_GATE],
64 hws[RV_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
67 hws[RV_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1",
68 "clk48MHz", 0, fch_data->base + MISCCLKCNTL1,
69 OSCCLKENB, CLK_GATE_SET_TO_DISABLE, NULL);
71 devm_clk_hw_register_clkdev(&pdev->dev, hws[RV_CLK_GATE],
78 static int fch_clk_remove(struct platform_device *pdev)
81 struct fch_clk_data *fch_data;
83 fch_data = dev_get_platdata(&pdev->dev);
85 clks = fch_data->is_rv ? RV_MAX_CLKS : ST_MAX_CLKS;
87 for (i = 0; i < clks; i++)
88 clk_hw_unregister(hws[i]);
93 static struct platform_driver fch_clk_driver = {
96 .suppress_bind_attrs = true,
98 .probe = fch_clk_probe,
99 .remove = fch_clk_remove,
101 builtin_platform_driver(fch_clk_driver);