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path: root/drivers/usb/host/xhci-mtk.c
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Diffstat (limited to 'drivers/usb/host/xhci-mtk.c')
-rw-r--r--drivers/usb/host/xhci-mtk.c22
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);