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authorChunfeng Yun2017-02-07 14:13:32 +0800
committerGreg Kroah-Hartman2017-02-08 07:44:52 +0100
commitca12cb7cb06d08e54e3ac23b1ebe5ed81d68dbf0 (patch)
tree9cb8f774632323222a5170853d58060628d85d93 /drivers/usb/mtu3
parentcb6efc7bea96202dfd2ed6b34f20e3e291f2b6c0 (diff)
usb: mtu3: 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 <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/mtu3')
-rw-r--r--drivers/usb/mtu3/mtu3_plat.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index 19a345d6687d..c3125da66bab 100644
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -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,