clk: define to_clk_regmap() as inline function

Nesting container_of() causes warnings with W=2, which is
annoying if it happens in headers and fills the build log
like:

In file included from drivers/clk/qcom/clk-alpha-pll.c:6:
drivers/clk/qcom/clk-alpha-pll.c: In function 'clk_alpha_pll_hwfsm_enable':
include/linux/kernel.h:852:8: warning: declaration of '__mptr' shadows a previous local [-Wshadow]
  852 |  void *__mptr = (void *)(ptr);     \
      |        ^~~~~~
drivers/clk/qcom/clk-alpha-pll.c:155:31: note: in expansion of macro 'container_of'
  155 | #define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \
      |                               ^~~~~~~~~~~~
drivers/clk/qcom/clk-regmap.h:27:28: note: in expansion of macro 'container_of'
   27 | #define to_clk_regmap(_hw) container_of(_hw, struct clk_regmap, hw)
      |                            ^~~~~~~~~~~~
drivers/clk/qcom/clk-alpha-pll.c:155:44: note: in expansion of macro 'to_clk_regmap'
  155 | #define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \
      |                                            ^~~~~~~~~~~~~
drivers/clk/qcom/clk-alpha-pll.c:254:30: note: in expansion of macro 'to_clk_alpha_pll'
  254 |  struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
      |                              ^~~~~~~~~~~~~~~~
include/linux/kernel.h:852:8: note: shadowed declaration is here
  852 |  void *__mptr = (void *)(ptr);     \
      |        ^~~~~~

Redefine two copies of the to_clk_regmap() macro as inline functions
to avoid a lot of these.

Fixes: ea11dda ("clk: meson: add regmap clocks")
Fixes: 085d7a4 ("clk: qcom: Add a regmap type clock struct")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201026161411.3708639-1-arnd@kernel.org
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: arndb

drivers/clk/meson/clk-regmap.h

@@ -26,7 +26,10 @@ struct clk_regmap {
 	void		*data;
 };
 
-#define to_clk_regmap(_hw) container_of(_hw, struct clk_regmap, hw)
+static inline struct clk_regmap *to_clk_regmap(struct clk_hw *hw)
+{
+	return container_of(hw, struct clk_regmap, hw);
+}
 
 /**
  * struct clk_regmap_gate_data - regmap backed gate specific data

drivers/clk/qcom/clk-regmap.h

@@ -24,7 +24,11 @@ struct clk_regmap {
 	unsigned int enable_mask;
 	bool enable_is_inverted;
 };
-#define to_clk_regmap(_hw) container_of(_hw, struct clk_regmap, hw)
+
+static inline struct clk_regmap *to_clk_regmap(struct clk_hw *hw)
+{
+	return container_of(hw, struct clk_regmap, hw);
+}
 
 int clk_is_enabled_regmap(struct clk_hw *hw);
 int clk_enable_regmap(struct clk_hw *hw);