diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/clk/tegra/clk-audio-sync.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-audio-sync.c b/drivers/clk/tegra/clk-audio-sync.c new file mode 100644 index 000000000..2c4bb96ea --- /dev/null +++ b/drivers/clk/tegra/clk-audio-sync.c @@ -0,0 +1,75 @@ +// 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; +} |