// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. */ #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; } 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; } 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; } 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 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->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; } |