cregit-Linux how code gets into the kernel

Release 4.7 drivers/clk/tegra/clk-audio-sync.c

/*
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/err.h>

#include "clk.h"


static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); return sync->rate; }

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static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); if (rate > sync->max_rate) return -EINVAL; else return rate; }

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static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); sync->rate = rate; return 0; }

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const struct clk_ops tegra_clk_sync_source_ops = { .round_rate = clk_sync_source_round_rate, .set_rate = clk_sync_source_set_rate, .recalc_rate = clk_sync_source_recalc_rate, };
struct clk *tegra_clk_register_sync_source(const char *name, unsigned long rate, unsigned long max_rate) { struct tegra_clk_sync_source *sync; struct clk_init_data init; struct clk *clk; sync = kzalloc(sizeof(*sync), GFP_KERNEL); if (!sync) { pr_err("%s: could not allocate sync source clk\n", __func__); return ERR_PTR(-ENOMEM); } sync->rate = rate; sync->max_rate = max_rate; init.ops = &tegra_clk_sync_source_ops; init.name = name; init.flags = 0; init.parent_names = NULL; init.num_parents = 0; /* Data in .init is copied by clk_register(), so stack variable OK */ sync->hw.init = &init; clk = clk_register(NULL, &sync->hw); if (IS_ERR(clk)) kfree(sync); return clk; }

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