[PATCH v2 04/15] clk: sunxi-ng: Add fixed factor clock support

Maxime Ripard
2016-06-07T20:41:43Z

Some clocks in the Allwinner SoCs clock units are direct, fixed,
multipliers or dividers from their parent.

Add support for such clocks.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/clk/sunxi-ng/Makefile | 2 ++
drivers/clk/sunxi-ng/ccu_fixed_factor.c | 50 +++++++++++++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_fixed_factor.h | 50 +++++++++++++++++++++++++++++++++
3 files changed, 102 insertions(+)
create mode 100644 drivers/clk/sunxi-ng/ccu_fixed_factor.c
create mode 100644 drivers/clk/sunxi-ng/ccu_fixed_factor.h

diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index 4585443b3771..c59cf2ea509b 100644
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -2,3 +2,5 @@ obj-y += ccu_common.o
obj-y += ccu_reset.o

obj-y += ccu_frac.o
+
+obj-y += ccu_fixed_factor.o
diff --git a/drivers/clk/sunxi-ng/ccu_fixed_factor.c b/drivers/clk/sunxi-ng/ccu_fixed_factor.c
new file mode 100644
index 000000000000..0498dc5340ea
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_fixed_factor.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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.
+ */
+
+#include <linux/clk-provider.h>
+
+#include "ccu_fixed_factor.h"
+
+static unsigned long ccu_fixed_factor_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ccu_fixed_factor *fix = hw_to_ccu_fixed_factor(hw);
+
+ return parent_rate / fix->div * fix->mult;
+}
+
+static long ccu_fixed_factor_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct ccu_fixed_factor *fix = hw_to_ccu_fixed_factor(hw);
+
+ if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
+ unsigned long best_parent;
+
+ best_parent = (rate / fix->mult) * fix->div;
+ *parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
+ best_parent);
+ }
+
+ return *parent_rate / fix->div * fix->mult;
+}
+
+static int ccu_fixed_factor_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ return 0;
+}
+
+const struct clk_ops ccu_fixed_factor_ops = {
+ .recalc_rate = ccu_fixed_factor_recalc_rate,
+ .round_rate = ccu_fixed_factor_round_rate,
+ .set_rate = ccu_fixed_factor_set_rate,
+};
diff --git a/drivers/clk/sunxi-ng/ccu_fixed_factor.h b/drivers/clk/sunxi-ng/ccu_fixed_factor.h
new file mode 100644
index 000000000000..4e53dbc9d10b
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_fixed_factor.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016 Maxime Ripard. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef _CCU_FIXED_FACTOR_H_
+#define _CCU_FIXED_FACTOR_H_
+
+#include <linux/clk-provider.h>
+
+#include "ccu_common.h"
+
+struct ccu_fixed_factor {
+ u16 div;
+ u16 mult;
+
+ struct ccu_common common;
+};
+
+#define SUNXI_CCU_FIXED_FACTOR(_struct, _name, _parent, \
+ _div, _mult, _flags) \
+ struct ccu_fixed_factor _struct = { \
+ .div = _div, \
+ .mult = _mult, \
+ .common = { \
+ .hw.init = SUNXI_HW_INIT(_name, \
+ _parent, \
+ &ccu_fixed_factor_ops, \
+ _flags), \
+ }, \
+ }
+
+static inline struct ccu_fixed_factor *hw_to_ccu_fixed_factor(struct clk_hw *hw)
+{
+ struct ccu_common *common = hw_to_ccu_common(hw);
+
+ return container_of(common, struct ccu_fixed_factor, common);
+}
+
+extern const struct clk_ops ccu_fixed_factor_ops;
+
+#endif /* _CCU_FIXED_FACTOR_H_ */
--
2.8.3