1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-dummy.c b/drivers/clk/qcom/clk-dummy.c
new file mode 100644
index 000000000000..c08136563e31
--- /dev/null
+++ b/drivers/clk/qcom/clk-dummy.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/reset-controller.h>
+
+#include "clk-debug.h"
+
+struct clk_dummy {
+	struct clk_hw hw;
+	struct reset_controller_dev reset;
+	unsigned long rrate;
+};
+
+#define to_clk_dummy(_hw)	container_of(_hw, struct clk_dummy, hw)
+
+#define RESET_MAX	100
+
+static int dummy_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+					unsigned long parent_rate)
+{
+	struct clk_dummy *dummy = to_clk_dummy(hw);
+
+	dummy->rrate = rate;
+
+	pr_debug("set rate: %lu\n", rate);
+
+	return 0;
+}
+
+static long dummy_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+					unsigned long *parent_rate)
+{
+	return rate;
+}
+
+static unsigned long dummy_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct clk_dummy *dummy = to_clk_dummy(hw);
+
+	pr_debug("clock rate: %lu\n", dummy->rrate);
+
+	return dummy->rrate;
+}
+
+static int dummy_clk_set_flags(struct clk_hw *hw, unsigned flags)
+{
+	return 0;
+}
+
+struct clk_ops clk_dummy_ops = {
+	.set_rate = dummy_clk_set_rate,
+	.round_rate = dummy_clk_round_rate,
+	.recalc_rate = dummy_clk_recalc_rate,
+	.set_flags = dummy_clk_set_flags,
+	.debug_init = clk_debug_measure_add,
+};
+EXPORT_SYMBOL_GPL(clk_dummy_ops);
+
+static int dummy_reset_assert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	pr_debug("%s\n", __func__);
+	return 0;
+}
+
+static int dummy_reset_deassert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	pr_debug("%s\n", __func__);
+	return 0;
+}
+
+static struct reset_control_ops dummy_reset_ops = {
+	.assert         = dummy_reset_assert,
+	.deassert       = dummy_reset_deassert,
+};
+
+/**
+ * clk_register_dummy - register dummy clock with the
+ *				   clock framework
+ * @dev: device that is registering this clock
+ * @name: name of this clock
+ * @flags: framework-specific flags
+ * @node: device node
+ */
+static struct clk *clk_register_dummy(struct device *dev, const char *name,
+		unsigned long flags, struct device_node *node)
+{
+	struct clk_dummy *dummy;
+	struct clk *clk;
+	struct clk_init_data init = {};
+
+	/* allocate dummy clock */
+	dummy = kzalloc(sizeof(*dummy), GFP_KERNEL);
+	if (!dummy)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &clk_dummy_ops;
+	init.flags = flags | CLK_IS_BASIC;
+	init.num_parents = 0;
+	dummy->hw.init = &init;
+
+	/* register the clock */
+	clk = clk_register(dev, &dummy->hw);
+	if (IS_ERR(clk)) {
+		kfree(dummy);
+		return clk;
+	}
+
+	dummy->reset.of_node = node;
+	dummy->reset.ops = &dummy_reset_ops;
+	dummy->reset.nr_resets = RESET_MAX;
+
+	if (reset_controller_register(&dummy->reset))
+		pr_err("Failed to register reset controller for %s\n", name);
+	else
+		pr_info("Successfully registered a dummy reset controller for %s\n",
+								name);
+
+	return clk;
+}
+
+/**
+ * of_dummy_clk_setup() - Setup function for simple fixed rate clock
+ */
+static void of_dummy_clk_setup(struct device_node *node)
+{
+	struct clk *clk;
+	const char *clk_name = "dummy_clk";
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	clk = clk_register_dummy(NULL, clk_name, 0, node);
+	if (!IS_ERR(clk))
+		of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	else {
+		pr_err("Failed to register dummy clock controller for %s\n",
+								clk_name);
+		return;
+	}
+
+	pr_info("Successfully registered dummy clock for %s\n", clk_name);
+}
+CLK_OF_DECLARE(dummy_clk, "qcom,dummycc", of_dummy_clk_setup);