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1// SPDX-License-Identifier: GPL-2.02/*3 * Marvell Armada 37xx SoC xtal clocks4 *5 * Copyright (C) 2016 Marvell6 *7 * Gregory CLEMENT <gregory.clement@free-electrons.com>8 *9 */10 11#include <linux/clk-provider.h>12#include <linux/mfd/syscon.h>13#include <linux/platform_device.h>14#include <linux/regmap.h>15 16#define NB_GPIO1_LATCH 0x817#define XTAL_MODE BIT(9)18 19static int armada_3700_xtal_clock_probe(struct platform_device *pdev)20{21 struct device_node *np = pdev->dev.of_node;22 const char *xtal_name = "xtal";23 struct device_node *parent;24 struct regmap *regmap;25 struct clk_hw *xtal_hw;26 unsigned int rate;27 u32 reg;28 int ret;29 30 xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL);31 if (!xtal_hw)32 return -ENOMEM;33 34 platform_set_drvdata(pdev, xtal_hw);35 36 parent = np->parent;37 if (!parent) {38 dev_err(&pdev->dev, "no parent\n");39 return -ENODEV;40 }41 42 regmap = syscon_node_to_regmap(parent);43 if (IS_ERR(regmap)) {44 dev_err(&pdev->dev, "cannot get regmap\n");45 return PTR_ERR(regmap);46 }47 48 ret = regmap_read(regmap, NB_GPIO1_LATCH, ®);49 if (ret) {50 dev_err(&pdev->dev, "cannot read from regmap\n");51 return ret;52 }53 54 if (reg & XTAL_MODE)55 rate = 40000000;56 else57 rate = 25000000;58 59 of_property_read_string_index(np, "clock-output-names", 0, &xtal_name);60 xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate);61 if (IS_ERR(xtal_hw))62 return PTR_ERR(xtal_hw);63 ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw);64 65 return ret;66}67 68static void armada_3700_xtal_clock_remove(struct platform_device *pdev)69{70 of_clk_del_provider(pdev->dev.of_node);71}72 73static const struct of_device_id armada_3700_xtal_clock_of_match[] = {74 { .compatible = "marvell,armada-3700-xtal-clock", },75 { }76};77 78static struct platform_driver armada_3700_xtal_clock_driver = {79 .probe = armada_3700_xtal_clock_probe,80 .remove = armada_3700_xtal_clock_remove,81 .driver = {82 .name = "marvell-armada-3700-xtal-clock",83 .of_match_table = armada_3700_xtal_clock_of_match,84 },85};86 87builtin_platform_driver(armada_3700_xtal_clock_driver);88