Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755876Ab3JNKW0 (ORCPT ); Mon, 14 Oct 2013 06:22:26 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:40679 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755663Ab3JNKWY (ORCPT ); Mon, 14 Oct 2013 06:22:24 -0400 Message-ID: <525BC5A9.3060904@ti.com> Date: Mon, 14 Oct 2013 13:21:29 +0300 From: Roger Quadros User-Agent: Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121011 Thunderbird/16.0.1 MIME-Version: 1.0 To: Kishon Vijay Abraham I , , Vivek Gautam CC: , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH 2/7] usb: dwc3: adapt dwc3 core to use Generic PHY Framework References: <1378136591-7463-1-git-send-email-kishon@ti.com> <1378136591-7463-3-git-send-email-kishon@ti.com> <525814A9.7060106@ti.com> <525BB8C0.1070802@ti.com> In-Reply-To: <525BB8C0.1070802@ti.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8543 Lines: 258 +Vivek On 10/14/2013 12:26 PM, Kishon Vijay Abraham I wrote: > Hi Roger, > > On Friday 11 October 2013 08:39 PM, Roger Quadros wrote: >> Hi, >> >> On 09/02/2013 06:43 PM, Kishon Vijay Abraham I wrote: >>> Adapted dwc3 core to use the Generic PHY Framework. So for init, exit, >>> power_on and power_off the following APIs are used phy_init(), phy_exit(), >>> phy_power_on() and phy_power_off(). >>> >>> However using the old USB phy library wont be removed till the PHYs of all >>> other SoC's using dwc3 core is adapted to the Generic PHY Framework. >>> >>> Signed-off-by: Kishon Vijay Abraham I >>> --- >>> Documentation/devicetree/bindings/usb/dwc3.txt | 6 ++- >>> drivers/usb/dwc3/Kconfig | 1 + >>> drivers/usb/dwc3/core.c | 49 ++++++++++++++++++++++++ >>> drivers/usb/dwc3/core.h | 7 ++++ >>> 4 files changed, 61 insertions(+), 2 deletions(-) >>> >>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt >>> index e807635..471366d 100644 >>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt >>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt >>> @@ -6,11 +6,13 @@ Required properties: >>> - compatible: must be "snps,dwc3" >>> - reg : Address and length of the register set for the device >>> - interrupts: Interrupts used by the dwc3 controller. >>> + >>> +Optional properties: >>> - usb-phy : array of phandle for the PHY device. The first element >>> in the array is expected to be a handle to the USB2/HS PHY and >>> the second element is expected to be a handle to the USB3/SS PHY >>> - >>> -Optional properties: >>> + - phys: from the *Generic PHY* bindings >>> + - phy-names: from the *Generic PHY* bindings >>> - tx-fifo-resize: determines if the FIFO *has* to be reallocated. >>> >>> This is usually a subnode to DWC3 glue to which it is connected. >>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig >>> index cfc16dd..ad7ce83 100644 >>> --- a/drivers/usb/dwc3/Kconfig >>> +++ b/drivers/usb/dwc3/Kconfig >>> @@ -3,6 +3,7 @@ config USB_DWC3 >>> depends on (USB || USB_GADGET) && GENERIC_HARDIRQS && HAS_DMA >>> depends on EXTCON >>> select USB_PHY >>> + select GENERIC_PHY >>> select USB_XHCI_PLATFORM if USB_SUPPORT && USB_XHCI_HCD >>> help >>> Say Y or M here if your system has a Dual Role SuperSpeed >>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >>> index 428c29e..485d365 100644 >>> --- a/drivers/usb/dwc3/core.c >>> +++ b/drivers/usb/dwc3/core.c >>> @@ -82,6 +82,12 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc) >>> >>> usb_phy_init(dwc->usb2_phy); >>> usb_phy_init(dwc->usb3_phy); >> >> How about adding >> + if (dwc->usb2_phy) >> + usb_phy_init(dwc->usb2_phy); >> + if (dwc->usb3_phy) >> + usb_phy_init(dwc->usb3_phy); > > Thankfully that usb_phy_init will check if phy is NULL. >> >> both usb phy and generic phy shouldn't be present together. > > ok. >> >>> + >>> + if (dwc->usb2_generic_phy) >>> + phy_init(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_init(dwc->usb3_generic_phy); >>> + >>> mdelay(100); >>> >>> /* Clear USB3 PHY reset */ >>> @@ -343,6 +349,11 @@ static void dwc3_core_exit(struct dwc3 *dwc) >>> { >>> usb_phy_shutdown(dwc->usb2_phy); >>> usb_phy_shutdown(dwc->usb3_phy); >> >> here as well >> >>> + >>> + if (dwc->usb2_generic_phy) >>> + phy_power_off(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_power_off(dwc->usb3_generic_phy); >>> } >>> >>> #define DWC3_ALIGN_MASK (16 - 1) >>> @@ -427,6 +438,23 @@ static int dwc3_probe(struct platform_device *pdev) >>> dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3); >>> } >>> >>> + if (of_property_read_bool(node, "phys") || pdata->has_phy) { >>> + dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy"); >>> + if (IS_ERR(dwc->usb2_generic_phy)) { >>> + dev_err(dev, "no usb2 phy configured yet"); >>> + return PTR_ERR(dwc->usb2_generic_phy); >>> + } >>> + >>> + dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy"); >>> + if (IS_ERR(dwc->usb3_generic_phy)) { >>> + dev_err(dev, "no usb3 phy configured yet"); >>> + return PTR_ERR(dwc->usb3_generic_phy); >>> + } >> >> better to add >> + /* Don't use USB PHY if generic PHY was found */ >> + dwc->usb2_phy = dwc->usb3_phy = NULL; > > ok. >> >>> + } else { >> >> not required as we've used kzalloc for dwc. >> >>> + dwc->usb2_generic_phy = NULL; >>> + dwc->usb3_generic_phy = NULL; >>> + } >>> + >>> /* default to superspeed if no maximum_speed passed */ >>> if (dwc->maximum_speed == USB_SPEED_UNKNOWN) >>> dwc->maximum_speed = USB_SPEED_SUPER; >>> @@ -450,6 +478,11 @@ static int dwc3_probe(struct platform_device *pdev) >> >> if (dwc->usb2_phy) >> >>> usb_phy_set_suspend(dwc->usb2_phy, 0); >> >> if (dwc->usb3_phy) >> >>> usb_phy_set_suspend(dwc->usb3_phy, 0); >>> >>> + if (dwc->usb2_generic_phy) >>> + phy_power_on(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_power_on(dwc->usb3_generic_phy); >>> + >>> spin_lock_init(&dwc->lock); >>> platform_set_drvdata(pdev, dwc); >>> >>> @@ -576,6 +609,11 @@ static int dwc3_remove(struct platform_device *pdev) >> >> if (dwc->usb2_phy) >>> usb_phy_set_suspend(dwc->usb2_phy, 1); >> >> if (dwc->usb3_phy) >>> usb_phy_set_suspend(dwc->usb3_phy, 1); >>> >>> + if (dwc->usb2_generic_phy) >>> + phy_power_off(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_power_off(dwc->usb3_generic_phy); >>> + >>> pm_runtime_put(&pdev->dev); >>> pm_runtime_disable(&pdev->dev); >>> >>> @@ -673,6 +711,11 @@ static int dwc3_suspend(struct device *dev) >> >> if (dwc->usb3_phy) >>> usb_phy_shutdown(dwc->usb3_phy); >> >> if (dwc->usb2_phy) >>> usb_phy_shutdown(dwc->usb2_phy); >>> >>> + if (dwc->usb2_generic_phy) >>> + phy_exit(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_exit(dwc->usb3_generic_phy); >>> + >>> return 0; >>> } >>> >>> @@ -683,6 +726,12 @@ static int dwc3_resume(struct device *dev) >>> >> >> if (dwc->usb3_phy) >>> usb_phy_init(dwc->usb3_phy); >> >> if (dwc->usb2_phy) >>> usb_phy_init(dwc->usb2_phy); >>> + >>> + if (dwc->usb2_generic_phy) >>> + phy_init(dwc->usb2_generic_phy); >>> + if (dwc->usb3_generic_phy) >>> + phy_init(dwc->usb3_generic_phy); >>> + >>> msleep(100); >>> >>> spin_lock_irqsave(&dwc->lock, flags); >>> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h >>> index f8af8d4..01ec7d7 100644 >>> --- a/drivers/usb/dwc3/core.h >>> +++ b/drivers/usb/dwc3/core.h >>> @@ -31,6 +31,8 @@ >>> #include >>> #include >>> >>> +#include >>> + >>> /* Global constants */ >>> #define DWC3_EP0_BOUNCE_SIZE 512 >>> #define DWC3_ENDPOINTS_NUM 32 >>> @@ -613,6 +615,8 @@ struct dwc3_scratchpad_array { >>> * @dr_mode: requested mode of operation >>> * @usb2_phy: pointer to USB2 PHY >>> * @usb3_phy: pointer to USB3 PHY >>> + * @usb2_generic_phy: pointer to USB2 PHY >>> + * @usb3_generic_phy: pointer to USB3 PHY >>> * @dcfg: saved contents of DCFG register >>> * @gctl: saved contents of GCTL register >>> * @is_selfpowered: true when we are selfpowered >>> @@ -665,6 +669,9 @@ struct dwc3 { >>> struct usb_phy *usb2_phy; >>> struct usb_phy *usb3_phy; >>> >>> + struct phy *usb2_generic_phy; >>> + struct phy *usb3_generic_phy; >>> + >>> void __iomem *regs; >>> size_t regs_size; >>> >>> > > Do you have any suggestions on how to get only individual PHYs? like only > usb2phy or usb3phy? My earlier understanding was that both PHYs are needed only if .speed is "super-speed" and only usb2phy is needed for "high-speed". But as per Vivek's email it seems Samsung's exynos5 SoC doesn't need usb2phy for "super-speed". So to keeps things flexible, I can propose the following approach - if speed == 'high-speed' usb2phy must be present. usb3phy will be ignored if supplied. - if speed == 'super-speed' usb3phy must be present and usb2phy is optional but must be initialized if supplied. - if speed is not specified, we default to 'super-speed'. Felipe, does this address the issue you were facing with OMAP5? cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/