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

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Message-ID: <5762A5AE.5030400@roeck-us.net>
Date:	Thu, 16 Jun 2016 06:12:14 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Frank Wang <frank.wang@...k-chips.com>,
	Guenter Roeck <groeck@...gle.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Douglas Anderson <dianders@...omium.org>,
	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
Subject: Re: [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for
 Rockchip usb2phy

On 06/15/2016 06:47 PM, Frank Wang wrote:
> Hi Guenter & Heiko,
>
> On 2016/6/15 23:47, Guenter Roeck wrote:
>> On Tue, Jun 14, 2016 at 6:14 PM, Frank Wang <frank.wang@...k-chips.com> wrote:
>>> 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;
>>> +       }
>> This would never be NULL. At issue is that you don't assign port_cfg
>> if the port is _not_ a host port.
>
> Sorry, I made a mistake. How about something like the following:
>
Yes, that should work. Just keep in mind that there could always be
a port named "something-port", so you'll always need some kind of check
(and possibly return an error if a port with a wrong name is provided).

Thanks,
Guenter

> @@ -574,6 +579,15 @@ static int rockchip_usb2phy_probe(struct platform_device *pdev)
>                  struct rockchip_usb2phy_port *rport = &rphy->ports[index];
>                  struct phy *phy;
>
> +               /*
> +                * This driver aim to support both otg-port and host-port,
> +                * but unfortunately, the otg part is not ready in current,
> +                * so this comments and below codes are interim, which should
> +                * be removed after otg-port is supplied soon.
> +                */
> +               if (of_node_cmp(child_np->name, "host-port"))
> +                       goto next_child;
> +
>                  phy = devm_phy_create(dev, child_np, &rockchip_usb2phy_ops);
>                  if (IS_ERR(phy)) {
>                          dev_err(dev, "failed to create phy\n");
> @@ -582,17 +596,13 @@ static int rockchip_usb2phy_probe(struct platform_device *pdev)
>                  }
>
>                  rport->phy = phy;
> -
> -               /* initialize otg/host port separately */
> -               if (!of_node_cmp(child_np->name, "host-port")) {
> -                       ret = rockchip_usb2phy_host_port_init(rphy, rport,
> - child_np);
> -                       if (ret)
> -                               goto put_child;
> -               }
> -
>                  phy_set_drvdata(rport->phy, rport);
>
> +               ret = rockchip_usb2phy_host_port_init(rphy, rport, child_np);
> +               if (ret)
> +                       goto put_child;
> +
> +next_child:
>                  /* to prevent out of boundary */
>                  if (++index >= rphy->phy_cfg->num_ports)
>                          break;
>
>
> BR.
> Frank
>
>