1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
6 #include <linux/kernel.h>
8 #include <linux/platform_device.h>
9 #include <linux/clk-provider.h>
10 #include <linux/regmap.h>
11 #include <linux/module.h>
12 #include <linux/clk.h>
13 #include <linux/soc/qcom/smem.h>
15 #include <dt-bindings/clock/qcom,apss-ipq.h>
16 #include <dt-bindings/arm/qcom,ids.h>
19 #include "clk-regmap.h"
20 #include "clk-branch.h"
21 #include "clk-alpha-pll.h"
30 static const struct clk_parent_data parents_apcs_alias0_clk_src[] = {
32 { .fw_name = "gpll0" },
36 static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
39 { P_APSS_PLL_EARLY, 5 },
42 static struct clk_rcg2 apcs_alias0_clk_src = {
45 .parent_map = parents_apcs_alias0_clk_src_map,
46 .clkr.hw.init = &(struct clk_init_data){
47 .name = "apcs_alias0_clk_src",
48 .parent_data = parents_apcs_alias0_clk_src,
49 .num_parents = ARRAY_SIZE(parents_apcs_alias0_clk_src),
50 .ops = &clk_rcg2_mux_closest_ops,
51 .flags = CLK_SET_RATE_PARENT,
55 static struct clk_branch apcs_alias0_core_clk = {
59 .enable_mask = BIT(0),
60 .hw.init = &(struct clk_init_data){
61 .name = "apcs_alias0_core_clk",
62 .parent_hws = (const struct clk_hw *[]){
63 &apcs_alias0_clk_src.clkr.hw },
65 .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
66 .ops = &clk_branch2_ops,
71 static const struct regmap_config apss_ipq6018_regmap_config = {
75 .max_register = 0x1000,
79 static struct clk_regmap *apss_ipq6018_clks[] = {
80 [APCS_ALIAS0_CLK_SRC] = &apcs_alias0_clk_src.clkr,
81 [APCS_ALIAS0_CORE_CLK] = &apcs_alias0_core_clk.clkr,
84 static const struct qcom_cc_desc apss_ipq6018_desc = {
85 .config = &apss_ipq6018_regmap_config,
86 .clks = apss_ipq6018_clks,
87 .num_clks = ARRAY_SIZE(apss_ipq6018_clks),
90 static int cpu_clk_notifier_fn(struct notifier_block *nb, unsigned long action,
97 if (action == PRE_RATE_CHANGE)
99 else if (action == POST_RATE_CHANGE || action == ABORT_RATE_CHANGE)
100 index = P_APSS_PLL_EARLY;
104 hw = &apcs_alias0_clk_src.clkr.hw;
105 err = clk_rcg2_mux_closest_ops.set_parent(hw, index);
107 return notifier_from_errno(err);
110 static int apss_ipq6018_probe(struct platform_device *pdev)
112 struct clk_hw *hw = &apcs_alias0_clk_src.clkr.hw;
113 struct notifier_block *cpu_clk_notifier;
114 struct regmap *regmap;
118 ret = qcom_smem_get_soc_id(&soc_id);
122 regmap = dev_get_regmap(pdev->dev.parent, NULL);
126 ret = qcom_cc_really_probe(pdev, &apss_ipq6018_desc, regmap);
131 /* Only below variants of IPQ53xx support scaling */
132 case QCOM_ID_IPQ5332:
133 case QCOM_ID_IPQ5322:
134 case QCOM_ID_IPQ5300:
135 cpu_clk_notifier = devm_kzalloc(&pdev->dev,
136 sizeof(*cpu_clk_notifier),
138 if (!cpu_clk_notifier)
141 cpu_clk_notifier->notifier_call = cpu_clk_notifier_fn;
143 ret = devm_clk_notifier_register(&pdev->dev, hw->clk, cpu_clk_notifier);
154 static struct platform_driver apss_ipq6018_driver = {
155 .probe = apss_ipq6018_probe,
157 .name = "qcom,apss-ipq6018-clk",
161 module_platform_driver(apss_ipq6018_driver);
163 MODULE_DESCRIPTION("QCOM APSS IPQ 6018 CLK Driver");
164 MODULE_LICENSE("GPL v2");