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Commit f3c4c737 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
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usb: xhci-mtk: make the reference clock optional 



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

Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ca12cb7c

drivers/usb/host/xhci-mtk.c

+9 −2
Original line number Diff line number Diff line
@@ -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");