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usb: mtu3: make the reference clock optional

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Make the reference clock optional for DTS backward compatibility
and ignore the error if it does not exist.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2017-02-07 14:13:32 +08:00 committed by Greg Kroah-Hartman
parent cb6efc7bea
commit ca12cb7cb0
1 changed files with 9 additions and 2 deletions
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11
drivers/usb/mtu3/mtu3_plat.c
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@ -225,10 +225,17 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
return PTR_ERR(ssusb->sys_clk);
}
/*
* reference clock is usually a "fixed-clock", make it optional
* for backward compatibility and ignore the error if it does
* not exist.
*/
ssusb->ref_clk = devm_clk_get(dev, "ref_ck");
if (IS_ERR(ssusb->ref_clk)) {
dev_err(dev, "failed to get ref clock\n");
return PTR_ERR(ssusb->ref_clk);
if (PTR_ERR(ssusb->ref_clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
ssusb->ref_clk = NULL;
}
ssusb->num_phys = of_count_phandle_with_args(node,