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Subject[PATCH V4 07/12] clk: sprd: add composite clock support
Date
This patch introduced composite clock driver for Spreadtrum's SoCs.
The functions of this composite clock simply consists of divider
and mux clocks.

Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
---
drivers/clk/sprd/Makefile | 1 +
drivers/clk/sprd/composite.c | 65 ++++++++++++++++++++++++++++++++++++++++++++
drivers/clk/sprd/composite.h | 55 +++++++++++++++++++++++++++++++++++++
3 files changed, 121 insertions(+)
create mode 100644 drivers/clk/sprd/composite.c
create mode 100644 drivers/clk/sprd/composite.h

diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
index 80e6039..2262e76 100644
--- a/drivers/clk/sprd/Makefile
+++ b/drivers/clk/sprd/Makefile
@@ -4,3 +4,4 @@ clk-sprd-y += common.o
clk-sprd-y += gate.o
clk-sprd-y += mux.o
clk-sprd-y += div.o
+clk-sprd-y += composite.o
diff --git a/drivers/clk/sprd/composite.c b/drivers/clk/sprd/composite.c
new file mode 100644
index 0000000..30d5b36
--- /dev/null
+++ b/drivers/clk/sprd/composite.c
@@ -0,0 +1,65 @@
+/*
+ * Spreadtrum composite clock driver
+ *
+ * Copyright (C) 2017 Spreadtrum, Inc.
+ * Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/clk-provider.h>
+
+#include "composite.h"
+
+DEFINE_SPINLOCK(sprd_comp_lock);
+EXPORT_SYMBOL_GPL(sprd_comp_lock);
+
+static long sprd_comp_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+ return sprd_div_helper_round_rate(&cc->common, &cc->div,
+ rate, parent_rate);
+}
+
+static unsigned long sprd_comp_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+ return sprd_div_helper_recalc_rate(&cc->common, &cc->div, parent_rate);
+}
+
+static int sprd_comp_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+ return sprd_div_helper_set_rate(&cc->common, &cc->div,
+ rate, parent_rate);
+}
+
+static u8 sprd_comp_get_parent(struct clk_hw *hw)
+{
+ struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+ return sprd_mux_helper_get_parent(&cc->common, &cc->mux);
+}
+
+static int sprd_comp_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+ return sprd_mux_helper_set_parent(&cc->common, &cc->mux, index);
+}
+
+const struct clk_ops sprd_comp_ops = {
+ .get_parent = sprd_comp_get_parent,
+ .set_parent = sprd_comp_set_parent,
+
+ .round_rate = sprd_comp_round_rate,
+ .recalc_rate = sprd_comp_recalc_rate,
+ .set_rate = sprd_comp_set_rate,
+};
+EXPORT_SYMBOL_GPL(sprd_comp_ops);
diff --git a/drivers/clk/sprd/composite.h b/drivers/clk/sprd/composite.h
new file mode 100644
index 0000000..a9bd68d
--- /dev/null
+++ b/drivers/clk/sprd/composite.h
@@ -0,0 +1,55 @@
+/*
+ * Spreadtrum composite clock driver
+ *
+ * Copyright (C) 2017 Spreadtrum, Inc.
+ * Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _SPRD_COMPOSITE_H_
+#define _SPRD_COMPOSITE_H_
+
+#include "common.h"
+#include "mux.h"
+#include "div.h"
+
+struct sprd_comp {
+ struct sprd_mux_ssel mux;
+ struct sprd_div_internal div;
+ struct sprd_clk_common common;
+};
+
+#define SPRD_COMP_CLK_TABLE(_struct, _name, _parent, _reg, _table, \
+ _mshift, _mwidth, _dshift, _dwidth, _flags) \
+ struct sprd_comp _struct = { \
+ .mux = _SPRD_MUX_CLK(_mshift, _mwidth, _table), \
+ .div = _SPRD_DIV_CLK(_dshift, _dwidth), \
+ .common = { \
+ .regmap = NULL, \
+ .reg = _reg, \
+ .lock = &sprd_comp_lock, \
+ .hw.init = CLK_HW_INIT_PARENTS(_name, \
+ _parent, \
+ &sprd_comp_ops, \
+ _flags), \
+ } \
+ }
+
+#define SPRD_COMP_CLK(_struct, _name, _parent, _reg, _mshift, \
+ _mwidth, _dshift, _dwidth, _flags) \
+ SPRD_COMP_CLK_TABLE(_struct, _name, _parent, _reg, \
+ NULL, _mshift, _mwidth, \
+ _dshift, _dwidth, _flags)
+
+static inline struct sprd_comp *hw_to_sprd_comp(const struct clk_hw *hw)
+{
+ struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
+
+ return container_of(common, struct sprd_comp, common);
+}
+
+extern const struct clk_ops sprd_comp_ops;
+extern spinlock_t sprd_comp_lock;
+
+#endif /* _SPRD_COMPOSITE_H_ */
--
2.7.4
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