Subject: [v3 PATCH 3/5] phy: Add USB Type-C PHY driver for rk3399

From: [email-masked] (Chris Zhong)
Date: Fri, 24 Jun 2016 08:34:21 +0800

Hi Guenter

On 06/24/2016 05:47 AM, Guenter Roeck wrote:
> Hi Chris,
>
> On Thu, Jun 23, 2016 at 5:51 AM, Chris Zhong <[email-masked]> wrote:
>> Add a PHY provider driver for the rk3399 SoC Type-c PHY. The USB
>> Type-C PHY is designed to support the USB3 and DP applications. The
>> PHY basically has two main components: USB3 and DisplyPort. USB3
>> operates in SuperSpeed mode and the DP can operate at RBR, HBR and
>> HBR2 data rates.
>>
>> Signed-off-by: Chris Zhong <[email-masked]>
>> Signed-off-by: Kever Yang <[email-masked]>
>>
> [ ... ]
>
>> +
>> +static void tcphy_get_state(struct rockchip_typec_phy *tcphy,
>> +                           struct extcon_dev *edev)
>> +{
>> +       int mode;
>> +       bool plugged, flip, pin_assign, dfp, ufp, dp;
>> +
>> +       ufp = extcon_get_cable_state_(edev, EXTCON_USB);
>> +       dfp = extcon_get_cable_state_(edev, EXTCON_USB_HOST);
>> +       dp = extcon_get_cable_state_(edev, EXTCON_DISP_DP);
>> +       flip = extcon_get_cable_state_(edev, EXTCON_TYPEC_POLARITY);
>> +       pin_assign = extcon_get_cable_state_(edev, EXTCON_TYPEC_PIN_ASSIGN);
>> +
>> +       plugged = ufp | dfp | dp;
>> +       tcphy->flip = flip;
>> +
>> +       if (plugged) {
>> +               if (ufp) {
>> +                       mode = MODE_UFP_USB;
>> +               } else if (dfp && !dp) {
>> +                       mode = MODE_DFP_USB;
>> +               } else if (dfp && dp) {
>> +                       mode = MODE_DFP_USB | MODE_DFP_DP;
>> +                       tcphy->pin_assign = pin_assign ? PIN_MAP_D : PIN_MAP_B;
>> +               } else {
>> +                       mode = MODE_DFP_DP;
>> +                       tcphy->pin_assign = pin_assign ? PIN_MAP_C : PIN_MAP_A;
> I am having trouble extracting pin_assign from our code. What
> determines if map A or C should be selected ?
>
> Thanks,
> Guenter
Oh, forgot rename the macro:

PIN_MAP_ should be PIN_ASSIGN_

  IF EXTCON_TYPEC_PIN_ASSIGN is attached, Type-C get
  Pin_Assignment_C(for DP only mode) or Pin_Assignment_D(for DP alt mode),
   if detached, it get the default Assignment: A(for DP only mode) or 
B(for DP alt mode),.

I am going to add a comment for describe which PIN_ASSIGN_ should be 
selected
in next version, if no one disagrees the usage of cable