On Tue, 16 Jul 2013, boris brezillon wrote:
> >> + uclk = clk_get(&pdev->dev, "usb_clk");
> >> + if (IS_ERR(uclk)) {
> >> + uclk = NULL;
> >> + dev_warn(&pdev->dev, "failed to get usb_clk\n");
> >> + }
> > Is this really what you want for backward compatibility?
> Here are some proposition to remove the warning message:
>
> 1) replace it with a dev_info and change the message:
> dev_info(&pdev->dev, "failed to get usb_clk (most likely using old
> at91 clk implementation)\n");
> 2) drop the log and silently ignore the missing clk (I'm not a big fan
> of this solution
> as it may lead to some errors if we're using new clk implem and the
> clock is really missing)
> 3) rework the current clk_set_rate function to accept clk_set_rate on
> usb clk and add clk_lookup entries
> for the usb clk (I'm not a big fan of this solution neither as this
> modifications will only be used for a short time
> until the transition to common clk framework is completed).
Another possibility is to combine this change with the clock
implementation update, and do them in a single patch. Then backward
compatibility would not be an issue.
Alan Stern
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