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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>
This commit is contained in:
Chunfeng Yun 2017-01-18 14:08:24 +08:00 committed by Greg Kroah-Hartman
parent 4d70d0c6c1
commit 9c4afd429b
2 changed files with 16 additions and 0 deletions
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15
drivers/usb/host/xhci-mtk.c
View File

@ -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 +559,12 @@ 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);

1
drivers/usb/host/xhci-mtk.h
View File

@ -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;