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-rw-r--r--drivers/clk/tegra/clk-audio-sync.c75
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;
+}