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>
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index fbdcfef..6efc9b7 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -40,6 +40,7 @@
struct device *dev;
struct clk *clk;
struct regulator *vcc;
+ struct regulator *reset;
};
static struct platform_device *pd;
@@ -80,6 +81,12 @@
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 @@
{
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 @@
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";