1 files changed, 56 insertions, 7 deletions

diff --git a/drivers/clk/meson/clk-regmap.c b/drivers/clk/meson/clk-regmap.c
index 07f7e441b916..1ed56fe63cae 100644
--- a/drivers/clk/meson/clk-regmap.c
+++ b/drivers/clk/meson/clk-regmap.c
@@ -4,9 +4,52 @@
  * Author: Jerome Brunet <jbrunet@baylibre.com>
  */
 
+#include <linux/device.h>
 #include <linux/module.h>
+#include <linux/mfd/syscon.h>
 #include "clk-regmap.h"
 
+int clk_regmap_init(struct clk_hw *hw)
+{
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct device_node *np, *parent_np;
+	struct device *dev;
+
+	/* Allow regmap to be preset as it was historically done */
+	if (clk->map)
+		return 0;
+
+	/*
+	 * FIXME: what follows couples the controller implementation
+	 * and clk_regmap clock type. This situation is not desirable
+	 * but temporary, until the controller is able to register
+	 * a hook to initialize a clock type
+	 */
+
+	/* Check the usual dev enabled controller with an basic IO regmap */
+	dev = clk_hw_get_dev(hw);
+	if (dev) {
+		clk->map = dev_get_regmap(dev, NULL);
+		if (clk->map)
+			return 0;
+	}
+
+	/* Move on to early and syscon based controllers */
+	np = clk_hw_get_of_node(hw);
+	if (np) {
+		parent_np = of_get_parent(np);
+		clk->map = syscon_node_to_regmap(parent_np);
+		of_node_put(parent_np);
+
+		if (!IS_ERR_OR_NULL(clk->map))
+			return 0;
+	}
+
+	/* Bail out if regmap can't be found */
+	return -EINVAL;
+}
+EXPORT_SYMBOL_NS_GPL(clk_regmap_init, "CLK_MESON");
+
 static int clk_regmap_gate_endisable(struct clk_hw *hw, int enable)
 {
 	struct clk_regmap *clk = to_clk_regmap(hw);
@@ -45,16 +88,18 @@ static int clk_regmap_gate_is_enabled(struct clk_hw *hw)
 }
 
 const struct clk_ops clk_regmap_gate_ops = {
+	.init		= clk_regmap_init,
 	.enable = clk_regmap_gate_enable,
 	.disable = clk_regmap_gate_disable,
 	.is_enabled = clk_regmap_gate_is_enabled,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_gate_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_gate_ops, "CLK_MESON");
 
 const struct clk_ops clk_regmap_gate_ro_ops = {
+	.init		= clk_regmap_init,
 	.is_enabled = clk_regmap_gate_is_enabled,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_gate_ro_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_gate_ro_ops, "CLK_MESON");
 
 static unsigned long clk_regmap_div_recalc_rate(struct clk_hw *hw,
 						unsigned long prate)
@@ -121,17 +166,19 @@ static int clk_regmap_div_set_rate(struct clk_hw *hw, unsigned long rate,
 /* Would prefer clk_regmap_div_ro_ops but clashes with qcom */
 
 const struct clk_ops clk_regmap_divider_ops = {
+	.init = clk_regmap_init,
 	.recalc_rate = clk_regmap_div_recalc_rate,
 	.determine_rate = clk_regmap_div_determine_rate,
 	.set_rate = clk_regmap_div_set_rate,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_divider_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_divider_ops, "CLK_MESON");
 
 const struct clk_ops clk_regmap_divider_ro_ops = {
+	.init = clk_regmap_init,
 	.recalc_rate = clk_regmap_div_recalc_rate,
 	.determine_rate = clk_regmap_div_determine_rate,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_divider_ro_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_divider_ro_ops, "CLK_MESON");
 
 static u8 clk_regmap_mux_get_parent(struct clk_hw *hw)
 {
@@ -170,18 +217,20 @@ static int clk_regmap_mux_determine_rate(struct clk_hw *hw,
 }
 
 const struct clk_ops clk_regmap_mux_ops = {
+	.init		= clk_regmap_init,
 	.get_parent = clk_regmap_mux_get_parent,
 	.set_parent = clk_regmap_mux_set_parent,
 	.determine_rate = clk_regmap_mux_determine_rate,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_mux_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_mux_ops, "CLK_MESON");
 
 const struct clk_ops clk_regmap_mux_ro_ops = {
+	.init		= clk_regmap_init,
 	.get_parent = clk_regmap_mux_get_parent,
 };
-EXPORT_SYMBOL_NS_GPL(clk_regmap_mux_ro_ops, CLK_MESON);
+EXPORT_SYMBOL_NS_GPL(clk_regmap_mux_ro_ops, "CLK_MESON");
 
 MODULE_DESCRIPTION("Amlogic regmap backed clock driver");
 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 MODULE_LICENSE("GPL");
-MODULE_IMPORT_NS(CLK_MESON);
+MODULE_IMPORT_NS("CLK_MESON");