[RFC,3/8] clk: sunxi: mod1 clock support

Commit Message

Emilio López July 28, 2014, 3:49 a.m. UTC

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.

Not-signed-off-by: Emilio López <[e-mail]>
---

As I have no clients for these clocks, this is untested. It would be 
great to get an ack from the guys working on IIS or SPDIF

 drivers/clk/sunxi/Makefile       |  1 +
 drivers/clk/sunxi/clk-a10-mod1.c | 69 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 drivers/clk/sunxi/clk-a10-mod1.c

Patch

diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index a7a96f8..75d113d 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/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
 
diff --git a/drivers/clk/sunxi/clk-a10-mod1.c b/drivers/clk/sunxi/clk-a10-mod1.c
new file mode 100644
index 0000000..1357641
--- /dev/null
+++ b/drivers/clk/sunxi/clk-a10-mod1.c
@@ -0,0 +1,69 @@ 
+/*
+ * Copyright 2013 Emilio López
+ *
+ * Emilio López <[e-mail]>
+ *
+ * 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/clkdev.h>
+#include <linux/of.h>
+#include <linux/of_address.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 = 0;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!mux || !gate) {
+		kfree(mux);
+		kfree(gate);
+		return;
+	}
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+	reg = of_iomap(node, 0);
+
+	while (i < SUN4I_MOD1_MAX_PARENTS &&
+	       (parents[i] = of_clk_get_parent_name(node, i)) != NULL)
+		i++;
+
+	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))
+		of_clk_add_provider(node, of_clk_src_simple_get, clk);
+}
+CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk", sun4i_mod1_clk_setup);