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

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Message-ID: <328485b0-2c5d-5d5e-a21b-6a26e487a923@rock-chips.com>
Date:	Thu, 16 Jun 2016 09:47:54 +0800
From:	Frank Wang <frank.wang@...k-chips.com>
To:	Guenter Roeck <groeck@...gle.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	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 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:

@@ -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