107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 MediaTek Inc.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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static int __bring_up_enable(struct platform_device *pdev)
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{
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struct clk *clk;
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int clk_con, i;
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clk_con = of_count_phandle_with_args(pdev->dev.of_node, "clocks",
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"#clock-cells");
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for (i = 0; i < clk_con; i++) {
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clk = of_clk_get(pdev->dev.of_node, i);
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if (IS_ERR(clk)) {
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long ret = PTR_ERR(clk);
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if (ret == -EPROBE_DEFER)
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pr_notice("clk %d is not ready\n", i);
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else
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pr_notice("get clk %d fail, ret=%d, clk_con=%d\n",
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i, (int)ret, clk_con);
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} else {
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pr_notice("get clk [%d]: %s ok\n", i,
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__clk_get_name(clk));
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clk_prepare_enable(clk);
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}
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}
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return 0;
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}
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static int clk_bring_up_probe(struct platform_device *pdev)
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{
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return __bring_up_enable(pdev);
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}
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static int clk_post_ao_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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u32 enabled;
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of_property_read_u32(node, "mediatek,post_ao", &enabled);
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if (enabled != 1) {
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pr_notice("btypass_clk_post_ao\n");
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return 0;
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}
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return __bring_up_enable(pdev);
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}
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static const struct of_device_id bring_up_id_table[] = {
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{
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.compatible = "mediatek,clk-bring-up",
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.data = clk_bring_up_probe,
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}, {
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.compatible = "mediatek,clk-post-ao",
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.data = clk_post_ao_probe,
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}, {
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/* sentinel */
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}
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};
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static int bring_up_probe(struct platform_device *pdev)
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{
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int (*clk_probe)(struct platform_device *pd);
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int r;
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clk_probe = of_device_get_match_data(&pdev->dev);
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if (!clk_probe)
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return -EINVAL;
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r = clk_probe(pdev);
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if (r)
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dev_err(&pdev->dev,
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"could not register clock provider: %s: %d\n",
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pdev->name, r);
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return r;
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}
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static int bring_up_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver bring_up = {
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.probe = bring_up_probe,
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.remove = bring_up_remove,
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.driver = {
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.name = "bring_up",
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.owner = THIS_MODULE,
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.of_match_table = bring_up_id_table,
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},
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};
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module_platform_driver(bring_up);
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MODULE_LICENSE("GPL");
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