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usb: phy: nop: Manage PHY clock 

If the PHY has a clock associated to it then manage the clock.
We just enable the clock in .init() and disable it in .shutdown().

Add clk_rate parameter in platform data and configure the
clock rate during probe if supplied.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Roger Quadros 2013-03-12 13:24:21 +02:00 committed by Felipe Balbi
parent e4d7dc6674
commit 2319fb88e1
1 changed files with 53 additions and 1 deletions
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54
drivers/usb/otg/nop-usb-xceiv.c
View File

@ -32,10 +32,12 @@
#include <linux/usb/otg.h>
#include <linux/usb/nop-usb-xceiv.h>
#include <linux/slab.h>
#include <linux/clk.h>
struct nop_usb_xceiv {
struct usb_phy phy;
struct device *dev;
struct clk *clk;
};
static struct platform_device *pd;
@ -64,6 +66,24 @@ static int nop_set_suspend(struct usb_phy *x, int suspend)
return 0;
}
static int nop_init(struct usb_phy *phy)
{
struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
if (!IS_ERR(nop->clk))
clk_enable(nop->clk);
return 0;
}
static void nop_shutdown(struct usb_phy *phy)
{
struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
if (!IS_ERR(nop->clk))
clk_disable(nop->clk);
}
static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
{
if (!otg)
@ -112,10 +132,34 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
if (pdata)
type = pdata->type;
nop->clk = devm_clk_get(&pdev->dev, "main_clk");
if (IS_ERR(nop->clk)) {
dev_dbg(&pdev->dev, "Can't get phy clock: %ld\n",
PTR_ERR(nop->clk));
}
if (!IS_ERR(nop->clk) && pdata && pdata->clk_rate) {
err = clk_set_rate(nop->clk, pdata->clk_rate);
if (err) {
dev_err(&pdev->dev, "Error setting clock rate\n");
return err;
}
}
if (!IS_ERR(nop->clk)) {
err = clk_prepare(nop->clk);
if (err) {
dev_err(&pdev->dev, "Error preparing clock\n");
return err;
}
}
nop->dev = &pdev->dev;
nop->phy.dev = nop->dev;
nop->phy.label = "nop-xceiv";
nop->phy.set_suspend = nop_set_suspend;
nop->phy.init = nop_init;
nop->phy.shutdown = nop_shutdown;
nop->phy.state = OTG_STATE_UNDEFINED;
nop->phy.otg->phy = &nop->phy;
@ -126,7 +170,7 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
if (err) {
dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
err);
return err;
goto err_add;
}
platform_set_drvdata(pdev, nop);
@ -134,12 +178,20 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
return 0;
err_add:
if (!IS_ERR(nop->clk))
clk_unprepare(nop->clk);
return err;
}
static int nop_usb_xceiv_remove(struct platform_device *pdev)
{
struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
if (!IS_ERR(nop->clk))
clk_unprepare(nop->clk);
usb_remove_phy(&nop->phy);
platform_set_drvdata(pdev, NULL);