From f3c4c73704b2e1a66c74504721e0af403174fdd3 Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Tue, 7 Feb 2017 14:13:33 +0800 Subject: [PATCH] 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: Chunfeng Yun Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mtk.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index b30806a0d37a..9066ec9e0c2e 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -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"); -- 2.20.1