// SPDX-License-Identifier: GPL-2.0 /* * Marvell Armada 37xx SoC xtal clocks * * Copyright (C) 2016 Marvell * * Gregory CLEMENT <gregory.clement@free-electrons.com> * */ #include <linux/clk-provider.h> #include <linux/mfd/syscon.h> #include <linux/platform_device.h> #include <linux/regmap.h> #define NB_GPIO1_LATCH 0x8 #define XTAL_MODE BIT(9) static int armada_3700_xtal_clock_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; const char *xtal_name = "xtal"; struct device_node *parent; struct regmap *regmap; struct clk_hw *xtal_hw; unsigned int rate; u32 reg; int ret; xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL); if (!xtal_hw) return -ENOMEM; platform_set_drvdata(pdev, xtal_hw); parent = np->parent; if (!parent) { dev_err(&pdev->dev, "no parent\n"); return -ENODEV; } regmap = syscon_node_to_regmap(parent); if (IS_ERR(regmap)) { dev_err(&pdev->dev, "cannot get regmap\n"); return PTR_ERR(regmap); } ret = regmap_read(regmap, NB_GPIO1_LATCH, ®); if (ret) { dev_err(&pdev->dev, "cannot read from regmap\n"); return ret; } if (reg & XTAL_MODE) rate = 40000000; else rate = 25000000; of_property_read_string_index(np, "clock-output-names", 0, &xtal_name); xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate); if (IS_ERR(xtal_hw)) return PTR_ERR(xtal_hw); ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw); return ret; } static void armada_3700_xtal_clock_remove(struct platform_device *pdev) { of_clk_del_provider(pdev->dev.of_node); } static const struct of_device_id armada_3700_xtal_clock_of_match[] = { { .compatible = "marvell,armada-3700-xtal-clock", }, { } }; static struct platform_driver armada_3700_xtal_clock_driver = { .probe = armada_3700_xtal_clock_probe, .remove = armada_3700_xtal_clock_remove, .driver = { .name = "marvell-armada-3700-xtal-clock", .of_match_table = armada_3700_xtal_clock_of_match, }, }; builtin_platform_driver(armada_3700_xtal_clock_driver);