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