[PATCH] mips: lantiq: add support for clk_set_parent()

[Randy Dunlap]

Provide a simple implementation of clk_set_parent() in the lantiq
subarch so that callers of it will build without errors.

Fixes these build errors:

ERROR: modpost: "clk_set_parent" [sound/soc/jz4740/snd-soc-jz4740-i2s.ko] undefined!
ERROR: modpost: "clk_set_parent" [sound/soc/atmel/snd-soc-atmel-i2s.ko] undefined!

Fixes: 171bb2f19ed6 ("MIPS: Lantiq: Add initial support for Lantiq SoCs")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
--to=linux-mips@xxxxxxxxxxxxxxx --cc="John Crispin <john@xxxxxxxxxxx>" --cc="Jonathan Cameron <jic23@xxxxxxxxxx>" --cc="Russell King <linux@xxxxxxxxxxxxxxx>" --cc="Andy Shevchenko <andy.shevchenko@xxxxxxxxx>" --cc=alsa-devel@xxxxxxxxxxxxxxxx --to="Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>"
---
 arch/mips/lantiq/clk.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- linux-next-20211224.orig/arch/mips/lantiq/clk.c
+++ linux-next-20211224/arch/mips/lantiq/clk.c
@@ -164,6 +164,12 @@ struct clk *clk_get_parent(struct clk *c
 }
 EXPORT_SYMBOL(clk_get_parent);
 
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	return 0;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
 static inline u32 get_counter_resolution(void)
 {
 	u32 res;