1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/clk/st/clkgen-mux.c b/drivers/clk/st/clkgen-mux.c
new file mode 100644
index 0000000000..596e939ad9
--- /dev/null
+++ b/drivers/clk/st/clkgen-mux.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * clkgen-mux.c: ST GEN-MUX Clock driver
+ *
+ * Copyright (C) 2014 STMicroelectronics (R&D) Limited
+ *
+ * Authors: Stephen Gallimore <stephen.gallimore@st.com>
+ *	    Pankaj Dev <pankaj.dev@st.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include "clkgen.h"
+
+static const char ** __init clkgen_mux_get_parents(struct device_node *np,
+						       int *num_parents)
+{
+	const char **parents;
+	unsigned int nparents;
+
+	nparents = of_clk_get_parent_count(np);
+	if (WARN_ON(!nparents))
+		return ERR_PTR(-EINVAL);
+
+	parents = kcalloc(nparents, sizeof(const char *), GFP_KERNEL);
+	if (!parents)
+		return ERR_PTR(-ENOMEM);
+
+	*num_parents = of_clk_parent_fill(np, parents, nparents);
+	return parents;
+}
+
+struct clkgen_mux_data {
+	u32 offset;
+	u8 shift;
+	u8 width;
+	spinlock_t *lock;
+	unsigned long clk_flags;
+	u8 mux_flags;
+};
+
+static struct clkgen_mux_data stih407_a9_mux_data = {
+	.offset = 0x1a4,
+	.shift = 0,
+	.width = 2,
+	.lock = &clkgen_a9_lock,
+};
+
+static void __init st_of_clkgen_mux_setup(struct device_node *np,
+		struct clkgen_mux_data *data)
+{
+	struct clk *clk;
+	void __iomem *reg;
+	const char **parents;
+	int num_parents = 0;
+	struct device_node *parent_np;
+
+	/*
+	 * First check for reg property within the node to keep backward
+	 * compatibility, then if reg doesn't exist look at the parent node
+	 */
+	reg = of_iomap(np, 0);
+	if (!reg) {
+		parent_np = of_get_parent(np);
+		reg = of_iomap(parent_np, 0);
+		of_node_put(parent_np);
+		if (!reg) {
+			pr_err("%s: Failed to get base address\n", __func__);
+			return;
+		}
+	}
+
+	parents = clkgen_mux_get_parents(np, &num_parents);
+	if (IS_ERR(parents)) {
+		pr_err("%s: Failed to get parents (%ld)\n",
+				__func__, PTR_ERR(parents));
+		goto err_parents;
+	}
+
+	clk = clk_register_mux(NULL, np->name, parents, num_parents,
+				data->clk_flags | CLK_SET_RATE_PARENT,
+				reg + data->offset,
+				data->shift, data->width, data->mux_flags,
+				data->lock);
+	if (IS_ERR(clk))
+		goto err;
+
+	pr_debug("%s: parent %s rate %u\n",
+			__clk_get_name(clk),
+			__clk_get_name(clk_get_parent(clk)),
+			(unsigned int)clk_get_rate(clk));
+
+	kfree(parents);
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+	return;
+
+err:
+	kfree(parents);
+err_parents:
+	iounmap(reg);
+}
+
+static void __init st_of_clkgen_a9_mux_setup(struct device_node *np)
+{
+	st_of_clkgen_mux_setup(np, &stih407_a9_mux_data);
+}
+CLK_OF_DECLARE(clkgen_a9mux, "st,stih407-clkgen-a9-mux",
+		st_of_clkgen_a9_mux_setup);