linux-kernel - Re: [PATCH 3/3] usb: dwc3: keystone: Turn on USB3 PHY before controller

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Date:   Thu, 14 May 2020 13:21:52 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     robh+dt@...nel.org, vigneshr@...com, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] usb: dwc3: keystone: Turn on USB3 PHY before controller

Roger Quadros <rogerq@...com> writes:

> On 14/05/2020 04:37, Chunfeng Yun wrote:
>> On Wed, 2020-05-13 at 16:07 +0300, Roger Quadros wrote:
>>> The Local Power Sleep Controller (LPSC) dependency on AM65
>>> requires SERDES0 to be powered on before USB.
>>>
>>> We need to power up SERDES0 power domain and hold it on
>>> throughout the reset, init, power on sequence.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>> ---
>>>   drivers/usb/dwc3/dwc3-keystone.c | 47 +++++++++++++++++++++++++++++++-
>>>   1 file changed, 46 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
>>> index 1e14a6f4884b..46d46f3507fc 100644
>>> --- a/drivers/usb/dwc3/dwc3-keystone.c
>>> +++ b/drivers/usb/dwc3/dwc3-keystone.c
>>> @@ -14,6 +14,7 @@
>>>   #include <linux/dma-mapping.h>
>>>   #include <linux/io.h>
>>>   #include <linux/of_platform.h>
>>> +#include <linux/phy/phy.h>
>>>   #include <linux/pm_runtime.h>
>>>   
>>>   /* USBSS register offsets */
>>> @@ -34,6 +35,7 @@
>>>   struct dwc3_keystone {
>>>   	struct device			*dev;
>>>   	void __iomem			*usbss;
>>> +	struct phy			*usb3_phy;
>>>   };
>>>   
>>>   static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
>>> @@ -95,8 +97,44 @@ static int kdwc3_probe(struct platform_device *pdev)
>>>   	if (IS_ERR(kdwc->usbss))
>>>   		return PTR_ERR(kdwc->usbss);
>>>   
>>> -	pm_runtime_enable(kdwc->dev);
>>> +	/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
>>> +	kdwc->usb3_phy = devm_phy_get(dev, "usb3-phy");
>> Use devm_phy_optional_get() instead?
>
> Indeed, it seems better suited.

patches 1 and 2 are in testing/next

-- 
balbi

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