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Subject[PATCH v7 05/11] clk: actions: Add mux clock support
Date
Add support for Actions Semi mux clock together with helper
functions to be used in composite clock.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/clk/actions/Makefile | 1 +
drivers/clk/actions/owl-mux.c | 60 ++++++++++++++++++++++++++++++++++++++++++
drivers/clk/actions/owl-mux.h | 61 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 122 insertions(+)
create mode 100644 drivers/clk/actions/owl-mux.c
create mode 100644 drivers/clk/actions/owl-mux.h

diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile
index 1f0917872c9d..2d4aa8f35d90 100644
--- a/drivers/clk/actions/Makefile
+++ b/drivers/clk/actions/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_ACTIONS) += clk-owl.o

clk-owl-y += owl-common.o
clk-owl-y += owl-gate.o
+clk-owl-y += owl-mux.o
diff --git a/drivers/clk/actions/owl-mux.c b/drivers/clk/actions/owl-mux.c
new file mode 100644
index 000000000000..f9c6cf2540e4
--- /dev/null
+++ b/drivers/clk/actions/owl-mux.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL mux clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include "owl-mux.h"
+
+u8 owl_mux_helper_get_parent(const struct owl_clk_common *common,
+ const struct owl_mux_hw *mux_hw)
+{
+ u32 reg;
+ u8 parent;
+
+ regmap_read(common->regmap, mux_hw->reg, &reg);
+ parent = reg >> mux_hw->shift;
+ parent &= BIT(mux_hw->width) - 1;
+
+ return parent;
+}
+
+static u8 owl_mux_get_parent(struct clk_hw *hw)
+{
+ struct owl_mux *mux = hw_to_owl_mux(hw);
+
+ return owl_mux_helper_get_parent(&mux->common, &mux->mux_hw);
+}
+
+int owl_mux_helper_set_parent(const struct owl_clk_common *common,
+ struct owl_mux_hw *mux_hw, u8 index)
+{
+ u32 reg;
+
+ regmap_read(common->regmap, mux_hw->reg, &reg);
+ reg &= ~GENMASK(mux_hw->width + mux_hw->shift - 1, mux_hw->shift);
+ regmap_write(common->regmap, mux_hw->reg,
+ reg | (index << mux_hw->shift));
+
+ return 0;
+}
+
+static int owl_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct owl_mux *mux = hw_to_owl_mux(hw);
+
+ return owl_mux_helper_set_parent(&mux->common, &mux->mux_hw, index);
+}
+
+const struct clk_ops owl_mux_ops = {
+ .get_parent = owl_mux_get_parent,
+ .set_parent = owl_mux_set_parent,
+ .determine_rate = __clk_mux_determine_rate,
+};
diff --git a/drivers/clk/actions/owl-mux.h b/drivers/clk/actions/owl-mux.h
new file mode 100644
index 000000000000..834284c8c3ae
--- /dev/null
+++ b/drivers/clk/actions/owl-mux.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL mux clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#ifndef _OWL_MUX_H_
+#define _OWL_MUX_H_
+
+#include "owl-common.h"
+
+struct owl_mux_hw {
+ u32 reg;
+ u8 shift;
+ u8 width;
+};
+
+struct owl_mux {
+ struct owl_mux_hw mux_hw;
+ struct owl_clk_common common;
+};
+
+#define OWL_MUX_HW(_reg, _shift, _width) \
+ { \
+ .reg = _reg, \
+ .shift = _shift, \
+ .width = _width, \
+ }
+
+#define OWL_MUX(_struct, _name, _parents, _reg, \
+ _shift, _width, _flags) \
+ struct owl_mux _struct = { \
+ .mux_hw = OWL_MUX_HW(_reg, _shift, _width), \
+ .common = { \
+ .regmap = NULL, \
+ .hw.init = CLK_HW_INIT_PARENTS(_name, \
+ _parents, \
+ &owl_mux_ops, \
+ _flags), \
+ }, \
+ }
+
+static inline struct owl_mux *hw_to_owl_mux(const struct clk_hw *hw)
+{
+ struct owl_clk_common *common = hw_to_owl_clk_common(hw);
+
+ return container_of(common, struct owl_mux, common);
+}
+
+u8 owl_mux_helper_get_parent(const struct owl_clk_common *common,
+ const struct owl_mux_hw *mux_hw);
+int owl_mux_helper_set_parent(const struct owl_clk_common *common,
+ struct owl_mux_hw *mux_hw, u8 index);
+
+extern const struct clk_ops owl_mux_ops;
+
+#endif /* _OWL_MUX_H_ */
--
2.14.1
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