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75 lines
1.7 KiB
75 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include "clk.h" |
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static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); |
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return sync->rate; |
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} |
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static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *prate) |
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{ |
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struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); |
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if (rate > sync->max_rate) |
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return -EINVAL; |
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else |
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return rate; |
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} |
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static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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struct tegra_clk_sync_source *sync = to_clk_sync_source(hw); |
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sync->rate = rate; |
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return 0; |
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} |
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const struct clk_ops tegra_clk_sync_source_ops = { |
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.round_rate = clk_sync_source_round_rate, |
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.set_rate = clk_sync_source_set_rate, |
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.recalc_rate = clk_sync_source_recalc_rate, |
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}; |
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struct clk *tegra_clk_register_sync_source(const char *name, |
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unsigned long max_rate) |
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{ |
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struct tegra_clk_sync_source *sync; |
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struct clk_init_data init; |
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struct clk *clk; |
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sync = kzalloc(sizeof(*sync), GFP_KERNEL); |
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if (!sync) { |
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pr_err("%s: could not allocate sync source clk\n", __func__); |
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return ERR_PTR(-ENOMEM); |
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} |
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sync->max_rate = max_rate; |
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init.ops = &tegra_clk_sync_source_ops; |
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init.name = name; |
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init.flags = 0; |
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init.parent_names = NULL; |
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init.num_parents = 0; |
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/* Data in .init is copied by clk_register(), so stack variable OK */ |
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sync->hw.init = &init; |
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clk = clk_register(NULL, &sync->hw); |
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if (IS_ERR(clk)) |
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kfree(sync); |
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return clk; |
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}
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