linux-kernel - [PATCH 2/8] clk: Document deprecated things

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Date:   Tue,  2 Apr 2019 16:00:58 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: [PATCH 2/8] clk: Document deprecated things

We don't want driver authors to use the struct clk based registration
and provider APIs. Instead, they should use the clk_hw based APIs. Add
some notes in the kerneldoc to this effect.

Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/clk/clk.c            | 15 ++++++++++-----
 include/linux/clk-provider.h |  2 +-
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 75d13c0eff12..592e315f7cfd 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3240,8 +3240,10 @@ void __clk_free_clk(struct clk *clk)
  * @dev: device that is registering this clock
  * @hw: link to hardware-specific clock data
  *
- * clk_register is the primary interface for populating the clock tree with new
- * clock nodes.  It returns a pointer to the newly allocated struct clk which
+ * clk_register is the *deprecated* interface for populating the clock tree with
+ * new clock nodes. Use clk_hw_register() instead.
+ *
+ * Returns: a pointer to the newly allocated struct clk which
  * cannot be dereferenced by driver code but may be used in conjunction with the
  * rest of the clock API.  In the event of an error clk_register will return an
  * error code; drivers must test for an error code after calling clk_register.
@@ -3486,9 +3488,10 @@ static void devm_clk_hw_release(struct device *dev, void *res)
  * @dev: device that is registering this clock
  * @hw: link to hardware-specific clock data
  *
- * Managed clk_register(). Clocks returned from this function are
- * automatically clk_unregister()ed on driver detach. See clk_register() for
- * more information.
+ * Managed clk_register(). This function is *deprecated*, use devm_clk_hw_register() instead.
+ *
+ * Clocks returned from this function are automatically clk_unregister()ed on
+ * driver detach. See clk_register() for more information.
  */
 struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw)
 {
@@ -3820,6 +3823,8 @@ EXPORT_SYMBOL_GPL(of_clk_hw_onecell_get);
  * @np: Device node pointer associated with clock provider
  * @clk_src_get: callback for decoding clock
  * @data: context pointer for @clk_src_get callback.
+ *
+ * This function is *deprecated*. Use of_clk_add_hw_provider() instead.
  */
 int of_clk_add_provider(struct device_node *np,
 			struct clk *(*clk_src_get)(struct of_phandle_args *clkspec,
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b65b48cc31f1..adb8a58e213c 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -24,7 +24,7 @@
 #define CLK_SET_RATE_PARENT	BIT(2) /* propagate rate change up one level */
 #define CLK_IGNORE_UNUSED	BIT(3) /* do not gate even if unused */
 				/* unused */
-#define CLK_IS_BASIC		BIT(5) /* Basic clk, can't do a to_clk_foo() */
+#define CLK_IS_BASIC		BIT(5) /* deprecated, don't use */
 #define CLK_GET_RATE_NOCACHE	BIT(6) /* do not use the cached clk rate */
 #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */
 #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
-- 
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