The output buffer input mux can be configured in either of three states -- disabled, input from FOD, input from previous output. If the output buffer input mux is set to disabled, the code in vc5_clk_out_get_parent() would consider this an invalid setting and warn about it, which is not necessarily the case. In case the output buffer input mux is disabled, default to input from FOD to have some parent and don't print the warning. Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxx> Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Cc: Alexey Firago <alexey_firago@xxxxxxxxxx> Cc: Michael Turquette <mturquette@xxxxxxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Cc: linux-renesas-soc@xxxxxxxxxxxxxxx Tested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> on Salvator-XS with the display LVDS output. --- V2: Drop chunk adding useless newline --- drivers/clk/clk-versaclock5.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c index d835d48cf14d..248689d89632 100644 --- a/drivers/clk/clk-versaclock5.c +++ b/drivers/clk/clk-versaclock5.c @@ -541,6 +541,9 @@ static unsigned char vc5_clk_out_get_parent(struct clk_hw *hw) regmap_read(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num), &src); src &= mask; + if (src == 0) /* Input mux set to DISABLED */ + return 0; + if ((src & fodclkmask) == VC5_OUT_DIV_CONTROL_EN_FOD) return 0; -- 2.11.0
