linux-kernel - Re: [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for Rockchip usb2phy

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Date:	Wed, 15 Jun 2016 09:14:44 +0800
From:	Frank Wang <frank.wang@...k-chips.com>
To:	Heiko Stübner <heiko@...ech.de>,
	Guenter Roeck <groeck@...gle.com>
Cc:	Douglas Anderson <dianders@...omium.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Guenter Roeck <groeck@...omium.org>, jwerner@...omium.org,
	kishon@...com, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	Ziyuan Xu <xzy.xu@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>, william.wu@...k-chips.com,
	frank.wang@...k-chips.com
Subject: Re: [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for
 Rockchip usb2phy

Hi Heiko & Guenter,

On 2016/6/14 22:00, Heiko Stübner wrote:
> Am Dienstag, 14. Juni 2016, 06:50:31 schrieb Guenter Roeck:
>> On Tue, Jun 14, 2016 at 6:27 AM, Heiko Stübner <heiko@...ech.de> wrote:
>>> Am Montag, 13. Juni 2016, 10:10:10 schrieb Frank Wang:
>>>> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
>>>> than rk3288 and before, and most of phy-related registers are also
>>>> different from the past, so a new phy driver is required necessarily.
>>>>
>>>> Signed-off-by: Frank Wang <frank.wang@...k-chips.com>
>>>> ---
> [...]
>
>>>> +static int rockchip_usb2phy_init(struct phy *phy)
>>>> +{
>>>> +     struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>>>> +     struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
>>>> +     int ret;
>>>> +
>>>>
>>>          if (!rport->port_cfg)
>>>          
>>>                  return 0;
>>>
>>> Otherwise the currently empty otg-port will cause null-pointer
>>> dereferences
>>> when it gets assigned in the devicetree already.
>> Not really, at least not here - that port should not have port_id set
>> to USB2PHY_PORT_HOST.
>>
>> Does it even make sense to instantiate the otg port ? Is it going to
>> do anything without port configuration ?
> Ok, that would be the other option - not creating the phy in the driver.

Well, I will put this conditional inside *_host_port_init(), if it is an 
empty, the phy-device should not be created.
Something like the following:

--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -483,9 +483,13 @@ static int rockchip_usb2phy_host_port_init(struct 
rockchip_usb2phy *rphy,
  {
         int ret;

-       rport->port_id = USB2PHY_PORT_HOST;
         rport->port_cfg = &rphy->phy_cfg->port_cfgs[USB2PHY_PORT_HOST];
+       if (!rport->port_cfg) {
+               dev_err(rphy->dev, "no host port-config provided.\n");
+               return -EINVAL;
+       }

+       rport->port_id = USB2PHY_PORT_HOST;

> Or from what I've seen, handling it as similar to the host-port should work
> initially as well most likely, supplying the additional otg-parts later on.

@Guenter, just as Heiko said, the otg-parts is not ready now, it will be 
supplied later.


BR.
Frank