Hi Dan Thank you for your feedback > sound/soc/sh/rcar/adg.c:396 rsnd_adg_create_null_clk() > warn: passing zero to 'ERR_CAST' (snip) > The clk_register_fixed_rate() function doesn't have any documentation, > but generally when functions return a mix of error pointers and NULL > then the NULL case means the feature is deliberately disabled. So it > should not print an error message. Perhaps an info message at most. > > --> 396 return ERR_CAST(clk); > > No need to cast this. The types are the same. Thanks. Will fix these in next week. Thank you for your help !! Best regards --- Kuninori Morimoto