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Commit 9c4afd42 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
Browse files

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: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4d70d0c6

drivers/usb/host/xhci-mtk.c

+15 −0
Original line number Diff line number Diff line
@@ -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 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk) 
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 +559,12 @@ static int xhci_mtk_probe(struct platform_device *pdev) 
		return PTR_ERR(mtk->sys_clk);

	}



	mtk->ref_clk = devm_clk_get(dev, "ref_ck");

	if (IS_ERR(mtk->ref_clk)) {

		dev_err(dev, "fail to get ref_ck\n");

		return PTR_ERR(mtk->ref_clk);

	}



	mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");



	ret = usb_wakeup_of_property_parse(mtk, node);

drivers/usb/host/xhci-mtk.h

+1 −0
Original line number Diff line number Diff line
@@ -124,6 +124,7 @@ struct xhci_hcd_mtk { 
	struct regulator *vusb33;

	struct regulator *vbus;

	struct clk *sys_clk;	/* sys and mac clock */

	struct clk *ref_clk;

	struct clk *wk_deb_p0;	/* port0's wakeup debounce clock */

	struct clk *wk_deb_p1;

	struct regmap *pericfg;