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usb: xhci-mtk: add reference clock
usually, the reference clock comes from 26M oscillator directly, but some SoCs are not, add it for compatibility. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -212,6 +212,12 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
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{
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int ret;
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ret = clk_prepare_enable(mtk->ref_clk);
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if (ret) {
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dev_err(mtk->dev, "failed to enable ref_clk\n");
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goto ref_clk_err;
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}
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ret = clk_prepare_enable(mtk->sys_clk);
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if (ret) {
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dev_err(mtk->dev, "failed to enable sys_clk\n");
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@ -238,6 +244,8 @@ usb_p1_err:
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usb_p0_err:
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clk_disable_unprepare(mtk->sys_clk);
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sys_clk_err:
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clk_disable_unprepare(mtk->ref_clk);
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ref_clk_err:
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return -EINVAL;
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}
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@ -248,6 +256,7 @@ static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
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clk_disable_unprepare(mtk->wk_deb_p0);
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}
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clk_disable_unprepare(mtk->sys_clk);
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clk_disable_unprepare(mtk->ref_clk);
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}
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/* only clocks can be turn off for ip-sleep wakeup mode */
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@ -550,6 +559,12 @@ static int xhci_mtk_probe(struct platform_device *pdev)
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return PTR_ERR(mtk->sys_clk);
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}
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mtk->ref_clk = devm_clk_get(dev, "ref_ck");
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if (IS_ERR(mtk->ref_clk)) {
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dev_err(dev, "fail to get ref_ck\n");
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return PTR_ERR(mtk->ref_clk);
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}
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mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
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ret = usb_wakeup_of_property_parse(mtk, node);
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@ -124,6 +124,7 @@ struct xhci_hcd_mtk {
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struct regulator *vusb33;
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struct regulator *vbus;
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struct clk *sys_clk; /* sys and mac clock */
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struct clk *ref_clk;
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struct clk *wk_deb_p0; /* port0's wakeup debounce clock */
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struct clk *wk_deb_p1;
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struct regmap *pericfg;
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