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usb: xhci-mtk: 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 14:13:33 +08:00
committed by Greg Kroah-Hartman
parent ca12cb7cb0
commit f3c4c73704
1 changed files with 9 additions and 2 deletions
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drivers/usb/host/xhci-mtk.c
+9 -2
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@@ -559,10 +559,17 @@ static int xhci_mtk_probe(struct platform_device *pdev)
return PTR_ERR(mtk->sys_clk);
}
/*
* reference clock is usually a "fixed-clock", make it optional
* for backward compatibility and ignore the error if it does
* not exist.
*/
mtk->ref_clk = devm_clk_get(dev, "ref_ck");
if (IS_ERR(mtk->ref_clk)) {
dev_err(dev, "fail to get ref_ck\n");
return PTR_ERR(mtk->ref_clk);
if (PTR_ERR(mtk->ref_clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
mtk->ref_clk = NULL;
}
mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");