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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: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2017-01-18 14:08:23 +08:00 committed by Greg Kroah-Hartman
parent 5cbf2d69f6
commit 4d70d0c6c1
2 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/mtu3/mtu3.h
View File

@ -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;

21
drivers/usb/mtu3/mtu3_plat.c
View File

@ -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 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
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);