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Message-Id: <1398172302-24379-2-git-send-email-geert+renesas@glider.be>
Date: Tue, 22 Apr 2014 15:11:42 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Mike Turquette <mturquette@...aro.org>
Cc: Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 2/2] clk: Improve clk_ops documentation
General:
- Add parameter names to .round_rate() and .set_rate().
Documentation/clk.txt:
- Add missing parameter for .set_rate(),
- Add missing .debug_init().
include/linux/clk-provider.h:
- Add parent rate documentation for .round_rate(),
- Reorder documentation to match implementation order,
- Add missing documentation for .init().
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Documentation/clk.txt | 16 ++++++++++-----
include/linux/clk-provider.h | 44 ++++++++++++++++++++++++------------------
2 files changed, 36 insertions(+), 24 deletions(-)
diff --git a/Documentation/clk.txt b/Documentation/clk.txt
index c9c399af7c08..1fee72f4d331 100644
--- a/Documentation/clk.txt
+++ b/Documentation/clk.txt
@@ -68,21 +68,27 @@ the operations defined in clk.h:
int (*is_enabled)(struct clk_hw *hw);
unsigned long (*recalc_rate)(struct clk_hw *hw,
unsigned long parent_rate);
- long (*round_rate)(struct clk_hw *hw, unsigned long,
- unsigned long *);
+ long (*round_rate)(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate);
long (*determine_rate)(struct clk_hw *hw,
unsigned long rate,
unsigned long *best_parent_rate,
struct clk **best_parent_clk);
int (*set_parent)(struct clk_hw *hw, u8 index);
u8 (*get_parent)(struct clk_hw *hw);
- int (*set_rate)(struct clk_hw *hw, unsigned long);
+ int (*set_rate)(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate);
int (*set_rate_and_parent)(struct clk_hw *hw,
unsigned long rate,
- unsigned long parent_rate, u8 index);
+ unsigned long parent_rate,
+ u8 index);
unsigned long (*recalc_accuracy)(struct clk_hw *hw,
- unsigned long parent_accuracy);
+ unsigned long parent_accuracy);
void (*init)(struct clk_hw *hw);
+ int (*debug_init)(struct clk_hw *hw,
+ struct dentry *dentry);
};
Part 3 - hardware clk implementations
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index ec90b8a7806f..24c8ba4fa6ae 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -81,12 +81,20 @@ struct dentry;
* this op is not set then clock rate will be initialized to 0.
*
* @round_rate: Given a target rate as input, returns the closest rate actually
- * supported by the clock.
+ * supported by the clock. The parent rate is an input/output
+ * parameter.
*
* @determine_rate: Given a target rate as input, returns the closest rate
* actually supported by the clock, and optionally the parent clock
* that should be used to provide the clock rate.
*
+ * @set_parent: Change the input source of this clock; for clocks with multiple
+ * possible parents specify a new parent by passing in the index
+ * as a u8 corresponding to the parent in either the .parent_names
+ * or .parents arrays. This function in affect translates an
+ * array index into the value programmed into the hardware.
+ * Returns 0 on success, -EERROR otherwise.
+ *
* @get_parent: Queries the hardware to determine the parent of a clock. The
* return value is a u8 which specifies the index corresponding to
* the parent clock. This index can be applied to either the
@@ -97,26 +105,12 @@ struct dentry;
* multiple parents. It is optional (and unnecessary) for clocks
* with 0 or 1 parents.
*
- * @set_parent: Change the input source of this clock; for clocks with multiple
- * possible parents specify a new parent by passing in the index
- * as a u8 corresponding to the parent in either the .parent_names
- * or .parents arrays. This function in affect translates an
- * array index into the value programmed into the hardware.
- * Returns 0 on success, -EERROR otherwise.
- *
* @set_rate: Change the rate of this clock. The requested rate is specified
* by the second argument, which should typically be the return
* of .round_rate call. The third argument gives the parent rate
* which is likely helpful for most .set_rate implementation.
* Returns 0 on success, -EERROR otherwise.
*
- * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy
- * is expressed in ppb (parts per billion). The parent accuracy is
- * an input parameter.
- * Returns the calculated accuracy. Optional - if this op is not
- * set then clock accuracy will be initialized to parent accuracy
- * or 0 (perfect clock) if clock has no parent.
- *
* @set_rate_and_parent: Change the rate and the parent of this clock. The
* requested rate is specified by the second argument, which
* should typically be the return of .round_rate call. The
@@ -128,6 +122,18 @@ struct dentry;
* separately via calls to .set_parent and .set_rate.
* Returns 0 on success, -EERROR otherwise.
*
+ * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy
+ * is expressed in ppb (parts per billion). The parent accuracy is
+ * an input parameter.
+ * Returns the calculated accuracy. Optional - if this op is not
+ * set then clock accuracy will be initialized to parent accuracy
+ * or 0 (perfect clock) if clock has no parent.
+ *
+ * @init: Perform platform-specific initialization magic.
+ * This is not not used by any of the basic clock types.
+ * Please consider other ways of solving initialization problems
+ * before using this callback, as its use is discouraged.
+ *
* @debug_init: Set up type-specific debugfs entries for this clock. This
* is called once, after the debugfs directory entry for this
* clock has been created. The dentry pointer representing that
@@ -157,15 +163,15 @@ struct clk_ops {
void (*disable_unused)(struct clk_hw *hw);
unsigned long (*recalc_rate)(struct clk_hw *hw,
unsigned long parent_rate);
- long (*round_rate)(struct clk_hw *hw, unsigned long,
- unsigned long *);
+ long (*round_rate)(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate);
long (*determine_rate)(struct clk_hw *hw, unsigned long rate,
unsigned long *best_parent_rate,
struct clk **best_parent_clk);
int (*set_parent)(struct clk_hw *hw, u8 index);
u8 (*get_parent)(struct clk_hw *hw);
- int (*set_rate)(struct clk_hw *hw, unsigned long,
- unsigned long);
+ int (*set_rate)(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate);
int (*set_rate_and_parent)(struct clk_hw *hw,
unsigned long rate,
unsigned long parent_rate, u8 index);
--
1.7.9.5
--
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