// SPDX-License-Identifier: GPL-2.0 /* * Qualcomm A7 PLL driver * * Copyright (c) 2020, Linaro Limited * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> */ #include <linux/clk-provider.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include "clk-alpha-pll.h" #define LUCID_PLL_OFF_L_VAL 0x04 static const struct pll_vco lucid_vco[] = { { 249600000, 2000000000, 0 }, }; static struct clk_alpha_pll a7pll = { .offset = 0x100, .vco_table = lucid_vco, .num_vco = ARRAY_SIZE(lucid_vco), .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_LUCID], .clkr = { .hw.init = &(struct clk_init_data){ .name = "a7pll", .parent_data = &(const struct clk_parent_data){ .fw_name = "bi_tcxo", }, .num_parents = 1, .ops = &clk_alpha_pll_lucid_ops, }, }, }; static const struct alpha_pll_config a7pll_config = { .l = 0x39, .config_ctl_val = 0x20485699, .config_ctl_hi_val = 0x2261, .config_ctl_hi1_val = 0x029A699C, .user_ctl_val = 0x1, .user_ctl_hi_val = 0x805, }; static const struct regmap_config a7pll_regmap_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .max_register = 0x1000, .fast_io = true, }; static int qcom_a7pll_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct regmap *regmap; void __iomem *base; u32 l_val; int ret; base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) return PTR_ERR(base); regmap = devm_regmap_init_mmio(dev, base, &a7pll_regmap_config); if (IS_ERR(regmap)) return PTR_ERR(regmap); /* Configure PLL only if the l_val is zero */ regmap_read(regmap, a7pll.offset + LUCID_PLL_OFF_L_VAL, &l_val); if (!l_val) clk_lucid_pll_configure(&a7pll, regmap, &a7pll_config); ret = devm_clk_register_regmap(dev, &a7pll.clkr); if (ret) return ret; return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &a7pll.clkr.hw); } static const struct of_device_id qcom_a7pll_match_table[] = { { .compatible = "qcom,sdx55-a7pll" }, { } }; MODULE_DEVICE_TABLE(of, qcom_a7pll_match_table); static struct platform_driver qcom_a7pll_driver = { .probe = qcom_a7pll_probe, .driver = { .name = "qcom-a7pll", .of_match_table = qcom_a7pll_match_table, }, }; module_platform_driver(qcom_a7pll_driver); MODULE_DESCRIPTION("Qualcomm A7 PLL Driver"); MODULE_LICENSE("GPL v2");