clk: sunxi: mod1 clock support

The module 1 type of clocks consist of a gate and a mux and are used on
the audio blocks to mux and gate the PLL2 outputs for AC97, IIS or
SPDIF. This commit adds support for them on the sunxi clock driver.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>

drivers/clk/sunxi/Makefile

@@ -5,6 +5,7 @@
 obj-y += clk-sunxi.o clk-factors.o
 obj-y += clk-a10-codec.o
 obj-y += clk-a10-hosc.o
+obj-y += clk-a10-mod1.o
 obj-y += clk-a10-pll2.o
 obj-y += clk-a20-gmac.o
 obj-y += clk-mod0.o

drivers/clk/sunxi/clk-a10-mod1.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2013 Emilio López
+ *
+ * Emilio López <emilio@elopez.com.ar>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/of_address.h>
+#include <linux/slab.h>
+
+static DEFINE_SPINLOCK(mod1_lock);
+
+#define SUN4I_MOD1_ENABLE	31
+#define SUN4I_MOD1_MUX		16
+#define SUN4I_MOD1_MUX_WIDTH	2
+#define SUN4I_MOD1_MAX_PARENTS	4
+
+static void __init sun4i_mod1_clk_setup(struct device_node *node)
+{
+	struct clk *clk;
+	struct clk_mux *mux;
+	struct clk_gate *gate;
+	const char *parents[4];
+	const char *clk_name = node->name;
+	void __iomem *reg;
+	int i;
+
+	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+	if (IS_ERR(reg))
+		return;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		goto err_unmap;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		goto err_free_mux;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+	i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
+
+	gate->reg = reg;
+	gate->bit_idx = SUN4I_MOD1_ENABLE;
+	gate->lock = &mod1_lock;
+	mux->reg = reg;
+	mux->shift = SUN4I_MOD1_MUX;
+	mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
+	mux->lock = &mod1_lock;
+
+	clk = clk_register_composite(NULL, clk_name, parents, i,
+				     &mux->hw, &clk_mux_ops,
+				     NULL, NULL,
+				     &gate->hw, &clk_gate_ops, 0);
+	if (IS_ERR(clk))
+		goto err_free_gate;
+
+	of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+	return;
+
+err_free_gate:
+	kfree(gate);
+err_free_mux:
+	kfree(mux);
+err_unmap:
+	iounmap(reg);
+}
+CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
+	       sun4i_mod1_clk_setup);