mirror of https://gitee.com/openkylin/linux.git
159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/export.h>
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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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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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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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dev_err(dev, "Failed to get clk '%s': %d\n",
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clks[i].id, 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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EXPORT_SYMBOL(clk_bulk_get);
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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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