249 lines
5.0 KiB
C
249 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2017 NXP
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*
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* Dong Aisheng <aisheng.dong@nxp.com>
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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/device.h>
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#include <linux/export.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
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struct clk_bulk_data *clks)
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{
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int ret;
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int i;
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for (i = 0; i < num_clks; i++) {
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clks[i].id = NULL;
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clks[i].clk = NULL;
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}
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for (i = 0; i < num_clks; i++) {
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of_property_read_string_index(np, "clock-names", i, &clks[i].id);
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clks[i].clk = of_clk_get(np, i);
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if (IS_ERR(clks[i].clk)) {
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ret = PTR_ERR(clks[i].clk);
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pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
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np, i, ret);
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clks[i].clk = NULL;
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goto err;
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}
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}
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return 0;
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err:
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clk_bulk_put(i, clks);
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return ret;
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}
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static int __must_check of_clk_bulk_get_all(struct device_node *np,
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struct clk_bulk_data **clks)
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{
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struct clk_bulk_data *clk_bulk;
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int num_clks;
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int ret;
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num_clks = of_clk_get_parent_count(np);
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if (!num_clks)
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return 0;
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clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
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if (!clk_bulk)
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return -ENOMEM;
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ret = of_clk_bulk_get(np, num_clks, clk_bulk);
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if (ret) {
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kfree(clk_bulk);
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return ret;
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}
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*clks = clk_bulk;
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return num_clks;
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}
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void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
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{
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while (--num_clks >= 0) {
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clk_put(clks[num_clks].clk);
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clks[num_clks].clk = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(clk_bulk_put);
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static int __clk_bulk_get(struct device *dev, int num_clks,
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struct clk_bulk_data *clks, bool optional)
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{
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int ret;
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int i;
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for (i = 0; i < num_clks; i++)
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clks[i].clk = NULL;
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for (i = 0; i < num_clks; i++) {
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clks[i].clk = clk_get(dev, clks[i].id);
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if (IS_ERR(clks[i].clk)) {
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ret = PTR_ERR(clks[i].clk);
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clks[i].clk = NULL;
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if (ret == -ENOENT && optional)
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continue;
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dev_err_probe(dev, ret,
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"Failed to get clk '%s'\n",
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clks[i].id);
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goto err;
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}
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}
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return 0;
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err:
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clk_bulk_put(i, clks);
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return ret;
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}
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int __must_check clk_bulk_get(struct device *dev, int num_clks,
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struct clk_bulk_data *clks)
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{
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return __clk_bulk_get(dev, num_clks, clks, false);
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}
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EXPORT_SYMBOL(clk_bulk_get);
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int __must_check clk_bulk_get_optional(struct device *dev, int num_clks,
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struct clk_bulk_data *clks)
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{
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return __clk_bulk_get(dev, num_clks, clks, true);
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}
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EXPORT_SYMBOL_GPL(clk_bulk_get_optional);
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void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
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{
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if (IS_ERR_OR_NULL(clks))
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return;
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clk_bulk_put(num_clks, clks);
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kfree(clks);
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}
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EXPORT_SYMBOL(clk_bulk_put_all);
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int __must_check clk_bulk_get_all(struct device *dev,
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struct clk_bulk_data **clks)
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{
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struct device_node *np = dev_of_node(dev);
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if (!np)
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return 0;
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return of_clk_bulk_get_all(np, clks);
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}
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EXPORT_SYMBOL(clk_bulk_get_all);
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#ifdef CONFIG_HAVE_CLK_PREPARE
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/**
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* clk_bulk_unprepare - undo preparation of a set of clock sources
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* @num_clks: the number of clk_bulk_data
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* @clks: the clk_bulk_data table being unprepared
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*
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* clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable.
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* Returns 0 on success, -EERROR otherwise.
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*/
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void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks)
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{
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while (--num_clks >= 0)
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clk_unprepare(clks[num_clks].clk);
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}
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EXPORT_SYMBOL_GPL(clk_bulk_unprepare);
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/**
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* clk_bulk_prepare - prepare a set of clocks
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* @num_clks: the number of clk_bulk_data
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* @clks: the clk_bulk_data table being prepared
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*
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* clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable.
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* Returns 0 on success, -EERROR otherwise.
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*/
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int __must_check clk_bulk_prepare(int num_clks,
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const struct clk_bulk_data *clks)
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{
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int ret;
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int i;
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for (i = 0; i < num_clks; i++) {
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ret = clk_prepare(clks[i].clk);
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if (ret) {
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pr_err("Failed to prepare clk '%s': %d\n",
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clks[i].id, ret);
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goto err;
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}
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}
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return 0;
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err:
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clk_bulk_unprepare(i, clks);
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return ret;
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}
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EXPORT_SYMBOL_GPL(clk_bulk_prepare);
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#endif /* CONFIG_HAVE_CLK_PREPARE */
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/**
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* clk_bulk_disable - gate a set of clocks
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* @num_clks: the number of clk_bulk_data
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* @clks: the clk_bulk_data table being gated
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*
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* clk_bulk_disable must not sleep, which differentiates it from
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* clk_bulk_unprepare. clk_bulk_disable must be called before
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* clk_bulk_unprepare.
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*/
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void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks)
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{
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while (--num_clks >= 0)
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clk_disable(clks[num_clks].clk);
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}
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EXPORT_SYMBOL_GPL(clk_bulk_disable);
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/**
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* clk_bulk_enable - ungate a set of clocks
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* @num_clks: the number of clk_bulk_data
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* @clks: the clk_bulk_data table being ungated
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*
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* clk_bulk_enable must not sleep
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* Returns 0 on success, -EERROR otherwise.
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*/
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int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks)
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{
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int ret;
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int i;
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for (i = 0; i < num_clks; i++) {
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ret = clk_enable(clks[i].clk);
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if (ret) {
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pr_err("Failed to enable clk '%s': %d\n",
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clks[i].id, ret);
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goto err;
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}
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}
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return 0;
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err:
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clk_bulk_disable(i, clks);
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return ret;
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}
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EXPORT_SYMBOL_GPL(clk_bulk_enable);
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