diff options
Diffstat (limited to 'drivers/usb/host/xhci-mtk.c')
| -rw-r--r-- | drivers/usb/host/xhci-mtk.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index bac961cd24ad..9066ec9e0c2e 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -212,6 +212,12 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk) { int ret; + ret = clk_prepare_enable(mtk->ref_clk); + if (ret) { + dev_err(mtk->dev, "failed to enable ref_clk\n"); + goto ref_clk_err; + } + ret = clk_prepare_enable(mtk->sys_clk); if (ret) { dev_err(mtk->dev, "failed to enable sys_clk\n"); @@ -238,6 +244,8 @@ usb_p1_err: usb_p0_err: clk_disable_unprepare(mtk->sys_clk); sys_clk_err: + clk_disable_unprepare(mtk->ref_clk); +ref_clk_err: return -EINVAL; } @@ -248,6 +256,7 @@ static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk) clk_disable_unprepare(mtk->wk_deb_p0); } clk_disable_unprepare(mtk->sys_clk); + clk_disable_unprepare(mtk->ref_clk); } /* only clocks can be turn off for ip-sleep wakeup mode */ @@ -550,6 +559,19 @@ 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)) { + 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"); ret = usb_wakeup_of_property_parse(mtk, node); |