1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-gpr-mux.c b/drivers/clk/imx/clk-gpr-mux.c
new file mode 100644
index 000000000000..c8d6090f15d6
--- /dev/null
+++ b/drivers/clk/imx/clk-gpr-mux.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ */
+
+#define pr_fmt(fmt) "imx:clk-gpr-mux: " fmt
+
+#include <linux/module.h>
+
+#include <linux/clk-provider.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include "clk.h"
+
+struct imx_clk_gpr {
+	struct clk_hw hw;
+	struct regmap *regmap;
+	u32 mask;
+	u32 reg;
+	const u32 *mux_table;
+};
+
+static struct imx_clk_gpr *to_imx_clk_gpr(struct clk_hw *hw)
+{
+	return container_of(hw, struct imx_clk_gpr, hw);
+}
+
+static u8 imx_clk_gpr_mux_get_parent(struct clk_hw *hw)
+{
+	struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(priv->regmap, priv->reg, &val);
+	if (ret)
+		goto get_parent_err;
+
+	val &= priv->mask;
+
+	ret = clk_mux_val_to_index(hw, priv->mux_table, 0, val);
+	if (ret < 0)
+		goto get_parent_err;
+
+	return ret;
+
+get_parent_err:
+	pr_err("failed to get parent (%pe)\n", ERR_PTR(ret));
+
+	/* return some realistic non negative value. Potentially we could
+	 * give index to some dummy error parent.
+	 */
+	return 0;
+}
+
+static int imx_clk_gpr_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
+	unsigned int val = clk_mux_index_to_val(priv->mux_table, 0, index);
+
+	return regmap_update_bits(priv->regmap, priv->reg, priv->mask, val);
+}
+
+static int imx_clk_gpr_mux_determine_rate(struct clk_hw *hw,
+					 struct clk_rate_request *req)
+{
+	return clk_mux_determine_rate_flags(hw, req, 0);
+}
+
+static const struct clk_ops imx_clk_gpr_mux_ops = {
+	.get_parent = imx_clk_gpr_mux_get_parent,
+	.set_parent = imx_clk_gpr_mux_set_parent,
+	.determine_rate = imx_clk_gpr_mux_determine_rate,
+};
+
+struct clk_hw *imx_clk_gpr_mux(const char *name, const char *compatible,
+			       u32 reg, const char **parent_names,
+			       u8 num_parents, const u32 *mux_table, u32 mask)
+{
+	struct clk_init_data init  = { };
+	struct imx_clk_gpr *priv;
+	struct regmap *regmap;
+	struct clk_hw *hw;
+	int ret;
+
+	regmap = syscon_regmap_lookup_by_compatible(compatible);
+	if (IS_ERR(regmap)) {
+		pr_err("failed to find %s regmap\n", compatible);
+		return ERR_CAST(regmap);
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &imx_clk_gpr_mux_ops;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
+
+	priv->hw.init = &init;
+	priv->regmap = regmap;
+	priv->mux_table = mux_table;
+	priv->reg = reg;
+	priv->mask = mask;
+
+	hw = &priv->hw;
+	ret = clk_hw_register(NULL, &priv->hw);
+	if (ret) {
+		kfree(priv);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}