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authorRoger Quadros <rogerq@ti.com>2013-03-12 13:24:23 +0200
committerFelipe Balbi <balbi@ti.com>2013-03-18 11:14:53 +0200
commitad63ebfc3565bbdec87ee4e30e4d40d164c1d3b8 (patch)
treef17e75e4422172392d4be8b1934733681d7984bf /drivers/usb/otg/nop-usb-xceiv.c
parent58f735fe4778d34d9d1e37bcdd59325d66a8793e (diff)
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usb: phy: nop: Handle RESET for the PHY
We expect the RESET line to be modeled as a regulator with supply name "reset". The regulator should be modeled such that enabling the regulator brings the PHY device out of RESET and disabling the regulator holds the device in RESET. They PHY will be held in RESET in .shutdown() and brought out of RESET in .init(). Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/otg/nop-usb-xceiv.c')
-rw-r--r--drivers/usb/otg/nop-usb-xceiv.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index fbdcfef7169b..6efc9b793333 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -40,6 +40,7 @@ struct nop_usb_xceiv {
struct device *dev;
struct clk *clk;
struct regulator *vcc;
+ struct regulator *reset;
};
static struct platform_device *pd;
@@ -80,6 +81,12 @@ static int nop_init(struct usb_phy *phy)
if (!IS_ERR(nop->clk))
clk_enable(nop->clk);
+ if (!IS_ERR(nop->reset)) {
+ /* De-assert RESET */
+ if (regulator_enable(nop->reset))
+ dev_err(phy->dev, "Failed to de-assert reset\n");
+ }
+
return 0;
}
@@ -87,6 +94,12 @@ static void nop_shutdown(struct usb_phy *phy)
{
struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
+ if (!IS_ERR(nop->reset)) {
+ /* Assert RESET */
+ if (regulator_disable(nop->reset))
+ dev_err(phy->dev, "Failed to assert reset\n");
+ }
+
if (!IS_ERR(nop->clk))
clk_disable(nop->clk);
@@ -172,6 +185,12 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
PTR_ERR(nop->vcc));
}
+ nop->reset = devm_regulator_get(&pdev->dev, "reset");
+ if (IS_ERR(nop->reset)) {
+ dev_dbg(&pdev->dev, "Error getting reset regulator: %ld\n",
+ PTR_ERR(nop->reset));
+ }
+
nop->dev = &pdev->dev;
nop->phy.dev = nop->dev;
nop->phy.label = "nop-xceiv";