From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kishon Vijay Abraham I Subject: Re: [PATCH v2 1/7] usb: dwc3: get "usb_phy" only if the platform indicates the presence of PHY's Date: Mon, 11 Nov 2013 20:06:12 +0530 Message-ID: <5280EB5C.1040001@ti.com> References: <1381866857-3861-1-git-send-email-kishon@ti.com> <1381866857-3861-2-git-send-email-kishon@ti.com> <20131017163828.GH11611@gimli> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20131017163828.GH11611@gimli> Sender: linux-omap-owner@vger.kernel.org To: balbi@ti.com Cc: gregkh@linuxfoundation.org, rob.herring@calxeda.com, pawel.moll@arm.com, mark.rutland@arm.com, swarren@wwwdotorg.org, ijc+devicetree@hellion.org.uk, rob@landley.net, bcousson@baylibre.com, tony@atomide.com, linux@arm.linux.org.uk, grant.likely@linaro.org, s.nawrocki@samsung.com, galak@codeaurora.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org List-Id: devicetree@vger.kernel.org Hi Felipe, On Thursday 17 October 2013 10:08 PM, Felipe Balbi wrote: > Hi, > > On Wed, Oct 16, 2013 at 01:24:11AM +0530, Kishon Vijay Abraham I wrote: >> There can be systems which does not have a external usb_phy, so get >> usb_phy only if dt data indicates the presence of PHY in the case of dt boot or >> if platform_data indicates the presence of PHY. Also remove checking if >> return value is -ENXIO since it's now changed to always enable usb_phy layer. >> >> Signed-off-by: Kishon Vijay Abraham I > > I'm fine with this patch, but one comment below: > >> @@ -387,16 +388,49 @@ static int dwc3_probe(struct platform_device *pdev) >> if (node) { >> dwc->maximum_speed = of_usb_get_maximum_speed(node); >> >> - dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0); >> - dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1); >> + count = of_count_phandle_with_args(node, "usb-phy", NULL); >> + switch (count) { >> + case 2: >> + dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, >> + "usb-phy", 1); >> + if (IS_ERR(dwc->usb3_phy)) { >> + dev_err(dev, "usb3 phy not found\n"); >> + return PTR_ERR(dwc->usb3_phy); >> + } >> + case 1: >> + dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, >> + "usb-phy", 0); >> + if (IS_ERR(dwc->usb2_phy)) { >> + dev_err(dev, "usb2 phy not found\n"); >> + return PTR_ERR(dwc->usb2_phy); >> + } >> + break; >> + default: >> + dev_err(dev, "usb phy nodes not configured\n"); >> + } >> >> dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize"); >> dwc->dr_mode = of_usb_get_dr_mode(node); >> } else if (pdata) { >> dwc->maximum_speed = pdata->maximum_speed; >> >> - dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); >> - dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3); >> + if (pdata->usb2_phy) { >> + dwc->usb2_phy = devm_usb_get_phy(dev, >> + USB_PHY_TYPE_USB2); >> + if (IS_ERR(dwc->usb2_phy)) { >> + dev_err(dev, "usb2 phy not found\n"); >> + return PTR_ERR(dwc->usb2_phy); >> + } >> + } >> + >> + if (pdata->usb3_phy) { >> + dwc->usb3_phy = devm_usb_get_phy(dev, >> + USB_PHY_TYPE_USB3); >> + if (IS_ERR(dwc->usb3_phy)) { >> + dev_err(dev, "usb3 phy not found\n"); >> + return PTR_ERR(dwc->usb3_phy); >> + } >> + } >> >> dwc->needs_fifo_resize = pdata->tx_fifo_resize; >> dwc->dr_mode = pdata->dr_mode; >> @@ -409,36 +443,6 @@ static int dwc3_probe(struct platform_device *pdev) >> if (dwc->maximum_speed == USB_SPEED_UNKNOWN) >> dwc->maximum_speed = USB_SPEED_SUPER; >> >> - if (IS_ERR(dwc->usb2_phy)) { >> - ret = PTR_ERR(dwc->usb2_phy); >> - >> - /* >> - * if -ENXIO is returned, it means PHY layer wasn't >> - * enabled, so it makes no sense to return -EPROBE_DEFER >> - * in that case, since no PHY driver will ever probe. >> - */ >> - if (ret == -ENXIO) >> - return ret; >> - >> - dev_err(dev, "no usb2 phy configured\n"); >> - return -EPROBE_DEFER; >> - } >> - >> - if (IS_ERR(dwc->usb3_phy)) { >> - ret = PTR_ERR(dwc->usb3_phy); >> - >> - /* >> - * if -ENXIO is returned, it means PHY layer wasn't >> - * enabled, so it makes no sense to return -EPROBE_DEFER >> - * in that case, since no PHY driver will ever probe. >> - */ >> - if (ret == -ENXIO) >> - return ret; >> - >> - dev_err(dev, "no usb3 phy configured\n"); >> - return -EPROBE_DEFER; >> - } > > the idea for doing the error checking here was actually to avoid > duplicating it in all previous cases, as you did. Please keep the error > checking here and you're good to go. > >> - >> dwc->xhci_resources[0].start = res->start; >> dwc->xhci_resources[0].end = dwc->xhci_resources[0].start + >> DWC3_XHCI_REGS_END; >> diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h >> index 7db34f0..49ffa6d 100644 >> --- a/drivers/usb/dwc3/platform_data.h >> +++ b/drivers/usb/dwc3/platform_data.h >> @@ -24,4 +24,6 @@ struct dwc3_platform_data { >> enum usb_device_speed maximum_speed; >> enum usb_dr_mode dr_mode; >> bool tx_fifo_resize; >> + bool usb2_phy; >> + bool usb3_phy; > > This would look better as a quirks flag, then we could: > > unsigned long quirks; > #define DWC3_QUIRK_NO_USB3_PHY BIT(0) > #define DWC3_QUIRK_NO_USB2_PHY BIT(1) Should this quirk be used for dt also? Currently we find if it has usb3 phy or usb2 phy from the dt data only. But if we add a quirk, we'll have to add a property to populate the quirk no? Thanks Kishon > > ... > > if (!test_bit(DWC3_QUIRK_NO_USB3_PHY), &dwc->quirks && > dwc->has_usb3_phy) { > grab_usb3_phy(); > } > > cheers >