76 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.4 */5 6#include <linux/clk-provider.h>7#include <linux/slab.h>8#include <linux/err.h>9 10#include "clk.h"11 12static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,13 unsigned long parent_rate)14{15 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);16 17 return sync->rate;18}19 20static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,21 unsigned long *prate)22{23 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);24 25 if (rate > sync->max_rate)26 return -EINVAL;27 else28 return rate;29}30 31static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,32 unsigned long parent_rate)33{34 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);35 36 sync->rate = rate;37 return 0;38}39 40const struct clk_ops tegra_clk_sync_source_ops = {41 .round_rate = clk_sync_source_round_rate,42 .set_rate = clk_sync_source_set_rate,43 .recalc_rate = clk_sync_source_recalc_rate,44};45 46struct clk *tegra_clk_register_sync_source(const char *name,47 unsigned long max_rate)48{49 struct tegra_clk_sync_source *sync;50 struct clk_init_data init;51 struct clk *clk;52 53 sync = kzalloc(sizeof(*sync), GFP_KERNEL);54 if (!sync) {55 pr_err("%s: could not allocate sync source clk\n", __func__);56 return ERR_PTR(-ENOMEM);57 }58 59 sync->max_rate = max_rate;60 61 init.ops = &tegra_clk_sync_source_ops;62 init.name = name;63 init.flags = 0;64 init.parent_names = NULL;65 init.num_parents = 0;66 67 /* Data in .init is copied by clk_register(), so stack variable OK */68 sync->hw.init = &init;69 70 clk = clk_register(NULL, &sync->hw);71 if (IS_ERR(clk))72 kfree(sync);73 74 return clk;75}76