From 21f0bf2d3dcc7b18cebe2fa3da700e3263c3a3ce Mon Sep 17 00:00:00 2001
From: Tero Kristo <t-kristo@ti.com>
Date: Thu, 29 Sep 2016 12:00:57 +0300
Subject: [PATCH] clk: ti: add support for automatic clock alias generation

Large portions of the OMAP framework still depend on the support of
having clock aliases in place, so add support functions for generating
these automatically.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
---
 drivers/clk/ti/clk.c   | 64 ++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/ti/clock.h |  3 ++
 2 files changed, 67 insertions(+)

diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index 5fcf247759ac..91bad55cfd5a 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -24,6 +24,7 @@
 #include <linux/list.h>
 #include <linux/regmap.h>
 #include <linux/bootmem.h>
+#include <linux/device.h>
 
 #include "clock.h"
 
@@ -453,3 +454,66 @@ void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
 		clk_prepare_enable(init_clk);
 	}
 }
+
+/**
+ * ti_clk_add_alias - add a clock alias for a TI clock
+ * @dev: device alias for this clock
+ * @clk: clock handle to create alias for
+ * @con: connection ID for this clock
+ *
+ * Creates a clock alias for a TI clock. Allocates the clock lookup entry
+ * and assigns the data to it. Returns 0 if successful, negative error
+ * value otherwise.
+ */
+int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con)
+{
+	struct clk_lookup *cl;
+
+	if (!clk)
+		return 0;
+
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+	if (!cl)
+		return -ENOMEM;
+
+	if (dev)
+		cl->dev_id = dev_name(dev);
+	cl->con_id = con;
+	cl->clk = clk;
+
+	clkdev_add(cl);
+
+	return 0;
+}
+
+/**
+ * ti_clk_register - register a TI clock to the common clock framework
+ * @dev: device for this clock
+ * @hw: hardware clock handle
+ * @con: connection ID for this clock
+ *
+ * Registers a TI clock to the common clock framework, and adds a clock
+ * alias for it. Returns a handle to the registered clock if successful,
+ * ERR_PTR value in failure.
+ */
+struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
+			    const char *con)
+{
+	struct clk *clk;
+	int ret;
+
+	clk = clk_register(dev, hw);
+	if (IS_ERR(clk))
+		return clk;
+
+	ret = ti_clk_add_alias(dev, clk, con);
+	if (ret) {
+		clk_unregister(clk);
+		return ERR_PTR(ret);
+	}
+
+	return clk;
+}
diff --git a/drivers/clk/ti/clock.h b/drivers/clk/ti/clock.h
index 13c37f48d9d6..c38de6d77e29 100644
--- a/drivers/clk/ti/clock.h
+++ b/drivers/clk/ti/clock.h
@@ -189,6 +189,9 @@ struct clk *ti_clk_register_mux(struct ti_clk *setup);
 struct clk *ti_clk_register_divider(struct ti_clk *setup);
 struct clk *ti_clk_register_composite(struct ti_clk *setup);
 struct clk *ti_clk_register_dpll(struct ti_clk *setup);
+struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
+			    const char *con);
+int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con);
 
 struct clk_hw *ti_clk_build_component_div(struct ti_clk_divider *setup);
 struct clk_hw *ti_clk_build_component_gate(struct ti_clk_gate *setup);
-- 
2.20.1