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Message-ID: <CAFp+6iE+xbSWWp2bNc5MRSUrA4Fi6qVU4vhR4+mtZHZGidkMGg@mail.gmail.com>
Date: Thu, 12 Sep 2013 16:17:08 +0530
From: Vivek Gautam <gautamvivek1987@...il.com>
To: Roger Quadros <rogerq@...com>
Cc: Kishon Vijay Abraham I <kishon@...com>,
Felipe Balbi <balbi@...com>,
Benoit Cousson <bcousson@...libre.com>,
Tony Lindgren <tony@...mide.com>,
Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Grant Likely <grant.likely@...aro.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Kumar Gala <galak@...eaurora.org>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ian.campbell@...rix.com>,
Rob Landley <rob@...dley.net>, george.cherian@...com,
Greg KH <gregkh@...uxfoundation.org>,
linux-doc@...r.kernel.org, linux-omap@...r.kernel.org,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Linux USB Mailing List <linux-usb@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] usb: dwc3: get "usb_phy" only if the platform
indicates the presence of PHY
On Thu, Sep 12, 2013 at 4:06 PM, Roger Quadros <rogerq@...com> wrote:
> Hi Kishon,
>
> On 09/02/2013 06:43 PM, Kishon Vijay Abraham I wrote:
>> There can be systems which does not have a external usb_phy, so get
>> usb_phy only if usb-phy property is added 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 <kishon@...com>
>> ---
>> drivers/usb/dwc3/Kconfig | 1 +
>> drivers/usb/dwc3/core.c | 60 +++++++++++++++++---------------------
>> drivers/usb/dwc3/platform_data.h | 1 +
>> 3 files changed, 28 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
>> index f969ea2..cfc16dd 100644
>> --- a/drivers/usb/dwc3/Kconfig
>> +++ b/drivers/usb/dwc3/Kconfig
>> @@ -2,6 +2,7 @@ config USB_DWC3
>> tristate "DesignWare USB3 DRD Core Support"
>> depends on (USB || USB_GADGET) && GENERIC_HARDIRQS && HAS_DMA
>> depends on EXTCON
>> + select USB_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 474162e..428c29e 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -387,16 +387,38 @@ 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);
>> + if (of_property_read_bool(node, "usb-phy")) {
>> + dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev,
>> + "usb-phy", 0);
>> + if (IS_ERR(dwc->usb2_phy))
>> + return PTR_ERR(dwc->usb2_phy);
>> + dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev,
>> + "usb-phy", 1);
>> + if (IS_ERR(dwc->usb3_phy))
>> + return PTR_ERR(dwc->usb3_phy);
>
> Some DWC3 instances use only usb2_phy. e.g. on DRA7 the 2nd dwc3 instance doesn't use usb3_phy.
> This needs to be a valid case and driver shouldn't error out.
So, i think adding flexibility to DWC3 to have either
usb2-phy/usb3-phy or both of them seems to be valid point.
Any suggestions ?
>
>> + } else {
>> + dwc->usb2_phy = NULL;
>> + dwc->usb3_phy = NULL;
>> + }
>>
>> 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->has_phy) {
>> + dwc->usb2_phy = devm_usb_get_phy(dev,
>> + USB_PHY_TYPE_USB2);
>> + if (IS_ERR(dwc->usb2_phy))
>> + return PTR_ERR(dwc->usb2_phy);
>> + dwc->usb3_phy = devm_usb_get_phy(dev,
>> + USB_PHY_TYPE_USB3);
>> + if (IS_ERR(dwc->usb3_phy))
>> + return PTR_ERR(dwc->usb3_phy);
>
> same here?
>
>> + } else {
>> + dwc->usb2_phy = NULL;
>> + dwc->usb3_phy = NULL;
>> + }
>>
>> dwc->needs_fifo_resize = pdata->tx_fifo_resize;
>> dwc->dr_mode = pdata->dr_mode;
>> @@ -409,36 +431,6 @@ 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;
>> - }
>> -
>> 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..5a5e068 100644
>> --- a/drivers/usb/dwc3/platform_data.h
>> +++ b/drivers/usb/dwc3/platform_data.h
>> @@ -24,4 +24,5 @@ struct dwc3_platform_data {
>> enum usb_device_speed maximum_speed;
>> enum usb_dr_mode dr_mode;
>> bool tx_fifo_resize;
>> + bool has_phy;
>> };
>>
>
> cheers,
> -roger
> --
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--
Best Regards
Vivek
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