diff options
| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2017-02-07 14:13:32 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-08 07:44:52 +0100 |
| commit | ca12cb7cb06d08e54e3ac23b1ebe5ed81d68dbf0 (patch) | |
| tree | 9cb8f774632323222a5170853d58060628d85d93 | |
| parent | cb6efc7bea96202dfd2ed6b34f20e3e291f2b6c0 (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>
| -rw-r--r-- | drivers/usb/mtu3/mtu3_plat.c | 11 |
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, |