92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
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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 <gregory.clement@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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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 0xC
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#define XTAL_MODE BIT(31)
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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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