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Groups > linux.kernel > #1298594

[RESEND PATCH v2 11/16] clk: simplify __clk_init_parent()

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The translation from the index into clk_core is done by
clk_core_get_parent_by_index().  The if-block for num_parents == 1
case is duplicating the code in the clk_core_get_parent_by_index().

Drop the "if (num_parents == 1)" from the special case.  Instead,
set the index to zero if .get_parent() is missing.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2: None

 drivers/clk/clk.c | 38 ++++----------------------------------
 1 file changed, 4 insertions(+), 34 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 4ad0a36..03b87d8 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1651,44 +1651,14 @@ struct clk *clk_get_parent(struct clk *clk)
 }
 EXPORT_SYMBOL_GPL(clk_get_parent);
 
-/*
- * .get_parent is mandatory for clocks with multiple possible parents.  It is
- * optional for single-parent clocks.  Always call .get_parent if it is
- * available and WARN if it is missing for multi-parent clocks.
- *
- * For single-parent clocks without .get_parent, first check to see if the
- * .parents array exists, and if so use it to avoid an expensive tree
- * traversal.  If .parents does not exist then walk the tree.
- */
 static struct clk_core *__clk_init_parent(struct clk_core *core)
 {
-	struct clk_core *ret = NULL;
-	u8 index;
-
-	/* handle the trivial cases */
+	u8 index = 0;
 
-	if (!core->num_parents)
-		goto out;
-
-	if (core->num_parents == 1) {
-		if (IS_ERR_OR_NULL(core->parent))
-			core->parent = clk_core_lookup(core->parent_names[0]);
-		ret = core->parent;
-		goto out;
-	}
+	if (core->ops->get_parent)
+		index = core->ops->get_parent(core->hw);
 
-	/*
-	 * Do our best to cache parent clocks in core->parents.  This prevents
-	 * unnecessary and expensive lookups.  We don't set core->parent here;
-	 * that is done by the calling function.
-	 */
-
-	index = core->ops->get_parent(core->hw);
-
-	ret = clk_core_get_parent_by_index(core, index);
-
-out:
-	return ret;
+	return clk_core_get_parent_by_index(core, index);
 }
 
 static void clk_core_reparent(struct clk_core *core,
-- 
1.9.1

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Thread

[RESEND PATCH v2 00/16] clk: a collection of various clean-ups and improvements Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 15/16] clk: simplify clk_fetch_parent_index() function Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 09/16] clk: replace pr_warn() with pr_err() for fatal cases Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 04/16] clk: remove unnecessary !core->parents conditional Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 02/16] clk: change the argument of __clk_init() into pointer to clk_core Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 14/16] clk: make sure parent is not NULL in clk_fetch_parent_index() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 05/16] clk: change sizeof(struct clk *) to sizeof(*core->parents) Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 11/16] clk: simplify __clk_init_parent() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 12/16] clk: avoid circular clock topology Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 16/16] clk: slightly optimize clk_core_set_parent() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 06/16] clk: move core->parents allocation to clk_register() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 03/16] clk: rename __clk_init() into __clk_core_init() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 10/16] clk: move checking .git_parent to __clk_core_init() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 08/16] clk: drop the initial core->parents look-ups from __clk_core_init() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100
  [RESEND PATCH v2 07/16] clk: simplify clk_core_get_parent_by_index() Masahiro Yamada <yamada.masahiro@socionext.com> - 2015-12-28 11:30 +0100

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