Commit 4d70d0c6 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
Browse files

usb: mtu3: 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 5cbf2d69

drivers/usb/mtu3/mtu3.h

+1 −0
Original line number Diff line number Diff line
@@ -225,6 +225,7 @@ struct ssusb_mtk { 
	/* common power & clock */

	struct regulator *vusb33;

	struct clk *sys_clk;

	struct clk *ref_clk;

	/* otg */

	struct otg_switch_mtk otg_switch;

	enum usb_dr_mode dr_mode;

drivers/usb/mtu3/mtu3_plat.c

+19 −2
Original line number Diff line number Diff line
@@ -123,7 +123,13 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb) 
	ret = clk_prepare_enable(ssusb->sys_clk);

	if (ret) {

		dev_err(ssusb->dev, "failed to enable sys_clk\n");

		goto clk_err;

		goto sys_clk_err;

	}



	ret = clk_prepare_enable(ssusb->ref_clk);

	if (ret) {

		dev_err(ssusb->dev, "failed to enable ref_clk\n");

		goto ref_clk_err;

	}



	ret = ssusb_phy_init(ssusb);
@@ -143,8 +149,10 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb) 
phy_err:

	ssusb_phy_exit(ssusb);

phy_init_err:

	clk_disable_unprepare(ssusb->ref_clk);

ref_clk_err:

	clk_disable_unprepare(ssusb->sys_clk);

clk_err:

sys_clk_err:

	regulator_disable(ssusb->vusb33);

vusb33_err:
@@ -154,6 +162,7 @@ vusb33_err: 
static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)

{

	clk_disable_unprepare(ssusb->sys_clk);

	clk_disable_unprepare(ssusb->ref_clk);

	regulator_disable(ssusb->vusb33);

	ssusb_phy_power_off(ssusb);

	ssusb_phy_exit(ssusb);
@@ -216,6 +225,12 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb) 
		return PTR_ERR(ssusb->sys_clk);

	}



	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);

	}



	ssusb->num_phys = of_count_phandle_with_args(node,

			"phys", "#phy-cells");

	if (ssusb->num_phys > 0) {
@@ -428,6 +443,7 @@ static int __maybe_unused mtu3_suspend(struct device *dev) 
	ssusb_host_disable(ssusb, true);

	ssusb_phy_power_off(ssusb);

	clk_disable_unprepare(ssusb->sys_clk);

	clk_disable_unprepare(ssusb->ref_clk);

	ssusb_wakeup_enable(ssusb);



	return 0;
@@ -445,6 +461,7 @@ static int __maybe_unused mtu3_resume(struct device *dev) 


	ssusb_wakeup_disable(ssusb);

	clk_prepare_enable(ssusb->sys_clk);

	clk_prepare_enable(ssusb->ref_clk);

	ssusb_phy_power_on(ssusb);

	ssusb_host_enable(ssusb);

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