clk: fixed-factor: Add CLK_FIXED_FACTOR_FW_NAME for DT clock-names parent

With the new clk parenting code, clk_init_data was expanded to include
.parent_data, for clk drivers to specify parents using a combination of
device tree clock-names, pointers to struct clk_hw, device tree clocks,
and/or fallback global clock names.

Add a new macro, CLK_FIXED_FACTOR_FW_NAME, that takes a string to match
a clock-names entry in the device tree to specify the clock parent.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

include/linux/clk-provider.h

@@ -1011,6 +1011,17 @@ extern struct of_device_id __clk_of_table;
 						  _flags),	\
 	}
 
+#define CLK_FIXED_FACTOR_FW_NAME(_struct, _name, _parent,		\
+				 _div, _mult, _flags)			\
+	struct clk_fixed_factor _struct = {				\
+		.div		= _div,					\
+		.mult		= _mult,				\
+		.hw.init	= CLK_HW_INIT_FW_NAME(_name,		\
+						      _parent,		\
+						      &clk_fixed_factor_ops, \
+						      _flags),		\
+	}
+
 #ifdef CONFIG_OF
 int of_clk_add_provider(struct device_node *np,
 			struct clk *(*clk_src_get)(struct of_phandle_args *args,