linux-kernel - [PATCH v2 02/25] clk: Add CLK_HW_INIT_* macros using .parent

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Date:   Tue, 11 Jun 2019 18:16:35 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Chen-Yu Tsai <wens@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>
Subject: [PATCH v2 02/25] clk: Add CLK_HW_INIT_* macros using .parent_hws

From: Chen-Yu Tsai <wens@...e.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@...e.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