> md->core_clk = devm_clk_get(&pdev->dev, NULL);
> if (md->core_clk == ERR_PTR(-ENOENT) || md->core_clk == ERR_PTR(-EINVAL)) {
> /* clock is optional, without it the default
> * rate divider register values will be used
> */
> md->core_clk = NULL;
> } else if (IS_ERR(md->core_clk)) {
> return PTR_ERR(md->core_clk);
> } else {
> rc = clk_prepare_enable(md->core_clk);
> ...
> }
As Florian pointed out, the clk_ API is happy to take a NULL pointer
for a clock. So you don't need this last else.
Andrew
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