1802d0beec
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
// 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/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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struct clk *clk;
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u32 range[2];
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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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clk = clk_register(NULL, &osc->hw);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get, clk);
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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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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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static int __init vexpress_osc_init(void)
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{
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return platform_driver_register(&vexpress_osc_driver);
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}
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core_initcall(vexpress_osc_init);
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