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122 lines
2.7 KiB
122 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Copyright (C) 2012 ARM Limited |
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*/ |
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#include <linux/clkdev.h> |
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#include <linux/clk-provider.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/vexpress.h> |
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struct vexpress_osc { |
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struct regmap *reg; |
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struct clk_hw hw; |
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unsigned long rate_min; |
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unsigned long rate_max; |
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}; |
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#define to_vexpress_osc(osc) container_of(osc, struct vexpress_osc, hw) |
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static unsigned long vexpress_osc_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct vexpress_osc *osc = to_vexpress_osc(hw); |
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u32 rate; |
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regmap_read(osc->reg, 0, &rate); |
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return rate; |
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} |
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static long vexpress_osc_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *parent_rate) |
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{ |
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struct vexpress_osc *osc = to_vexpress_osc(hw); |
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if (osc->rate_min && rate < osc->rate_min) |
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rate = osc->rate_min; |
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if (osc->rate_max && rate > osc->rate_max) |
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rate = osc->rate_max; |
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return rate; |
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} |
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static int vexpress_osc_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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struct vexpress_osc *osc = to_vexpress_osc(hw); |
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return regmap_write(osc->reg, 0, rate); |
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} |
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static const struct clk_ops vexpress_osc_ops = { |
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.recalc_rate = vexpress_osc_recalc_rate, |
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.round_rate = vexpress_osc_round_rate, |
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.set_rate = vexpress_osc_set_rate, |
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}; |
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static int vexpress_osc_probe(struct platform_device *pdev) |
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{ |
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struct clk_init_data init; |
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struct vexpress_osc *osc; |
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u32 range[2]; |
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int ret; |
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osc = devm_kzalloc(&pdev->dev, sizeof(*osc), GFP_KERNEL); |
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if (!osc) |
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return -ENOMEM; |
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osc->reg = devm_regmap_init_vexpress_config(&pdev->dev); |
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if (IS_ERR(osc->reg)) |
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return PTR_ERR(osc->reg); |
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if (of_property_read_u32_array(pdev->dev.of_node, "freq-range", range, |
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ARRAY_SIZE(range)) == 0) { |
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osc->rate_min = range[0]; |
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osc->rate_max = range[1]; |
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} |
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if (of_property_read_string(pdev->dev.of_node, "clock-output-names", |
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&init.name) != 0) |
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init.name = dev_name(&pdev->dev); |
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init.ops = &vexpress_osc_ops; |
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init.flags = 0; |
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init.num_parents = 0; |
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osc->hw.init = &init; |
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ret = devm_clk_hw_register(&pdev->dev, &osc->hw); |
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if (ret < 0) |
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return ret; |
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devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get, &osc->hw); |
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clk_hw_set_rate_range(&osc->hw, osc->rate_min, osc->rate_max); |
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dev_dbg(&pdev->dev, "Registered clock '%s'\n", init.name); |
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return 0; |
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} |
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static const struct of_device_id vexpress_osc_of_match[] = { |
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{ .compatible = "arm,vexpress-osc", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, vexpress_osc_of_match); |
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static struct platform_driver vexpress_osc_driver = { |
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.driver = { |
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.name = "vexpress-osc", |
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.of_match_table = vexpress_osc_of_match, |
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}, |
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.probe = vexpress_osc_probe, |
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}; |
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module_platform_driver(vexpress_osc_driver); |
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MODULE_LICENSE("GPL v2");
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