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Subject[PATCH v2 02/25] clk: Add CLK_HW_INIT_* macros using .parent_hws
Date
From: Chen-Yu Tsai <wens@csie.org>

With the new clk parenting code, struct clk_init_data was expanded to
include .parent_hws, for clk drivers to directly list parents by
pointing to their respective struct clk_hw's.

Add macros that can take either one single struct clk_hw *, or an array
of them, for drivers to use.

A special CLK_HW_INIT_HWS macro is included, which takes an array of
struct clk_hw *, but sets .num_parents to 1. This variant is to allow
the reuse of the array, instead of having a compound literal allocated
for each clk sharing the same parent.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
include/linux/clk-provider.h | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index bb6118f79784..70aad5cefea7 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -904,6 +904,29 @@ extern struct of_device_id __clk_of_table;
.ops = _ops, \
})

+#define CLK_HW_INIT_HW(_name, _parent, _ops, _flags) \
+ (&(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_hws = (const struct clk_hw*[]) { _parent }, \
+ .num_parents = 1, \
+ .ops = _ops, \
+ })
+
+/*
+ * This macro is intended for drivers to be able to share the otherwise
+ * individual struct clk_hw[] compound literals created by the compiler
+ * when using CLK_HW_INIT_HW. It does NOT support multiple parents.
+ */
+#define CLK_HW_INIT_HWS(_name, _parent, _ops, _flags) \
+ (&(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_hws = _parent, \
+ .num_parents = 1, \
+ .ops = _ops, \
+ })
+
#define CLK_HW_INIT_PARENTS(_name, _parents, _ops, _flags) \
(&(struct clk_init_data) { \
.flags = _flags, \
@@ -913,6 +936,15 @@ extern struct of_device_id __clk_of_table;
.ops = _ops, \
})

+#define CLK_HW_INIT_PARENTS_HW(_name, _parents, _ops, _flags) \
+ (&(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_hws = _parents, \
+ .num_parents = ARRAY_SIZE(_parents), \
+ .ops = _ops, \
+ })
+
#define CLK_HW_INIT_NO_PARENT(_name, _ops, _flags) \
(&(struct clk_init_data) { \
.flags = _flags, \
--
2.20.1
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