Hi, On Tue, Jul 10, 2012 at 11:16 AM, Rajendra Nayak <rnayak@xxxxxx> wrote: >> diff --git a/Documentation/devicetree/bindings/usb/omap-usb.txt >> b/Documentation/devicetree/bindings/usb/omap-usb.txt >> new file mode 100644 >> index 0000000..80a28c9 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/usb/omap-usb.txt >> @@ -0,0 +1,16 @@ >> +OMAP USB PHY >> + >> +OMAP USB2 PHY >> + >> +Required properties: >> + - compatible: Should be "ti,omap-usb2" >> + - reg : Address and length of the register set for the device. Also >> +add the address of control module dev conf register until a driver for >> +control module is added >> + >> +This is usually a subnode of ocp2scp to which it is connected. >> + >> +usb2phy@0x4a0ad080 { >> + compatible = "ti,omap-usb2"; >> + reg =<0x4a0ad080 0x58>; > > > Don;t you need a 'ti,hwmods' entry for this one? I don't think it needs one as it has nothing more than this one address space. (it doesn't have sysconfig, doesn't have any prcm register..). > > >> --- /dev/null >> +++ b/drivers/usb/otg/omap-usb2.c >> @@ -0,0 +1,273 @@ >> +/* >> + * omap-usb2.c - USB PHY, talking to musb controller in OMAP. >> + * >> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com > > > Copyright (C) 2012? Same for the couple of headers below. Will fix it. > > >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License as published by >> + * the Free Software Foundation; either version 2 of the License, or >> + * (at your option) any later version. >> + * >> + * Author: Kishon Vijay Abraham I<kishon@xxxxxx> >> + * >> + * This program is distributed in the hope that it will be useful, >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> + * GNU General Public License for more details. >> + * >> + */ >> + > > >> + >> +static int __devinit omap_usb2_probe(struct platform_device *pdev) >> +{ >> + struct omap_usb *phy; >> + struct usb_otg *otg; >> + struct resource *res; >> + >> + phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); >> + if (!phy) { >> + dev_err(&pdev->dev, "unable to allocate memory for USB2 >> PHY\n"); >> + return -ENOMEM; >> + } >> + >> + otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); >> + if (!otg) { >> + dev_err(&pdev->dev, "unable to allocate memory for USB >> OTG\n"); >> + return -ENOMEM; >> + } >> + >> + phy->dev =&pdev->dev; >> >> + >> + phy->phy.dev = phy->dev; >> + phy->phy.label = "omap-usb2"; >> + phy->phy.set_suspend = omap_usb2_suspend; >> + phy->phy.otg = otg; >> + >> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); >> + >> + phy->control_dev_conf = devm_request_and_ioremap(&pdev->dev, res); >> + if (phy->control_dev_conf == NULL) { >> + dev_err(&pdev->dev, "Failed to obtain io memory\n"); >> + return -ENXIO; >> + } >> + >> + phy->is_suspended = 1; >> + omap_usb_phy_power(phy, 0); >> + >> + otg->set_host = omap_usb_set_host; >> + otg->set_peripheral = omap_usb_set_peripheral; >> + otg->set_vbus = omap_usb_set_vbus; >> + otg->start_srp = omap_usb_start_srp; >> + otg->phy =&phy->phy; >> >> + >> + phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); > > > Why not just use clk_get()? What does devm_clk_get() do? It just associates the clk with the device. So whenever the the driver gets detached, the devres will take care to do a clk_put() of the clock. > > >> + if (IS_ERR(phy->wkupclk)) { >> + dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); >> + return PTR_ERR(phy->wkupclk); >> + } >> + clk_prepare(phy->wkupclk); > > > Ideally clk_prepare() is an extension of clk_enable() and is expected > to be used that way. Not to be clubbed with clk_get(). Same with > clk_unprepare(). Do you do a clk_enable()/_disable() in interrupt/ > atomic context? Currently it is called from a work queue. But Felipe wanted to remove those work_queue from omap2430 glue. Then this would be called from atomic context. A query for you here. If pm_runtime_get_sync() is called in interrupt context, will runtime resume of that device will also be called in the same context? > > >> + >> + usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2); >> + >> + platform_set_drvdata(pdev, phy); >> + >> + pm_runtime_enable(phy->dev); >> + >> + return 0; >> +} >> + >> +static int __devexit omap_usb2_remove(struct platform_device *pdev) >> +{ >> + struct omap_usb *phy = platform_get_drvdata(pdev); >> + >> + clk_unprepare(phy->wkupclk); >> + usb_remove_phy(&phy->phy); >> + platform_set_drvdata(pdev, NULL); >> + >> + return 0; >> +} >> + >> +#ifdef CONFIG_PM >> + >> +static int omap_usb2_runtime_suspend(struct device *dev) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + struct omap_usb *phy = platform_get_drvdata(pdev); >> + >> + clk_disable(phy->wkupclk); >> + >> + return 0; >> +} >> + >> +static int omap_usb2_runtime_resume(struct device *dev) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + struct omap_usb *phy = platform_get_drvdata(pdev); >> + >> + clk_enable(phy->wkupclk); >> + >> + return 0; >> +} >> + >> +static const struct dev_pm_ops omap_usb2_pm_ops = { >> + SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, >> omap_usb2_runtime_resume, >> + NULL) >> +}; >> + >> +#define DEV_PM_OPS (&omap_usb2_pm_ops) >> +#else >> +#define DEV_PM_OPS NULL >> +#endif >> + >> +#ifdef CONFIG_OF >> +static const struct of_device_id omap_usb2_id_table[] = { >> + { .compatible = "ti,omap-usb2" }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, omap_usb2_id_table); >> +#else >> +#define omap_usb2_id_table NULL; >> +#endif >> + >> +static struct platform_driver omap_usb2_driver = { >> + .probe = omap_usb2_probe, >> + .remove = __devexit_p(omap_usb2_remove), >> + .driver = { >> + .name = "omap-usb2", >> + .owner = THIS_MODULE, >> + .pm = DEV_PM_OPS, >> + .of_match_table = omap_usb2_id_table, > > > Use of_match_ptr() instead. Ok. And I'll remove #define omap_usb2_id_table NULL;. Thanks Kishon -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html