[v2,3/4] Documentation: bindings: add phy_config for Rockchip USB Type-C PHY
diff mbox

Message ID 1525861364-26323-3-git-send-email-hl@rock-chips.com
State New
Headers show

Commit Message

huang lin May 9, 2018, 10:22 a.m. UTC
If want to do training outside DP Firmware, need phy voltage swing
and pre_emphasis value.

Signed-off-by: Lin Huang <hl@rock-chips.com>
---
Changes in v2:
- rebase

 Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Sean Paul May 11, 2018, 2:43 p.m. UTC | #1
On Wed, May 09, 2018 at 06:22:43PM +0800, Lin Huang wrote:
> If want to do training outside DP Firmware, need phy voltage swing
> and pre_emphasis value.
> 
> Signed-off-by: Lin Huang <hl@rock-chips.com>

Adding Rob Herring so he has a hope of seeing this.

> ---
> Changes in v2:
> - rebase
> 
>  Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> index 960da7f..eda26dd 100644
> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> @@ -17,7 +17,9 @@ Required properties:
>  
>  Optional properties:
>   - extcon : extcon specifier for the Power Delivery
> -
> + - rockchip,phy_config : That's phy voltage swing and pre_emphasis
> +			 setting, if want to do dp training outside
> +			 dp firmware, need to add these value.

What are the units?

Sean

>  Required nodes : a sub-node is required for each port the phy provides.
>  		 The sub-node name is used to identify dp or usb3 port,
>  		 and shall be the following entries:
> -- 
> 2.7.4
>
Enric Balletbo Serra May 11, 2018, 4:09 p.m. UTC | #2
Hi Lin,

2018-05-11 16:43 GMT+02:00 Sean Paul <seanpaul@chromium.org>:
> On Wed, May 09, 2018 at 06:22:43PM +0800, Lin Huang wrote:
>> If want to do training outside DP Firmware, need phy voltage swing
>> and pre_emphasis value.
>>
>> Signed-off-by: Lin Huang <hl@rock-chips.com>
>
> Adding Rob Herring so he has a hope of seeing this.
>

And adding the devicetree ML, otherwise Rob will probably ignore the patch.

>> ---
>> Changes in v2:
>> - rebase
>>
>>  Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
>> index 960da7f..eda26dd 100644
>> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
>> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
>> @@ -17,7 +17,9 @@ Required properties:
>>
>>  Optional properties:
>>   - extcon : extcon specifier for the Power Delivery
>> -
>> + - rockchip,phy_config : That's phy voltage swing and pre_emphasis
>> +                      setting, if want to do dp training outside
>> +                      dp firmware, need to add these value.
>
> What are the units?
>

Also, I think that will be good add an example or include the property
in the current examples to see how works. It's not clear from the
property description. I suppose it is an array of pairs <swing
pre-emphasis>?

nit:

-rockchip,phy_config: A list of voltage swing (unit) and pre-emphasis
(unit) pairs. Use this property to enable software link training
instead of hardware link training.

Best regards,
 Enric

> Sean
>
>>  Required nodes : a sub-node is required for each port the phy provides.
>>                The sub-node name is used to identify dp or usb3 port,
>>                and shall be the following entries:
>> --
>> 2.7.4
>>
>
> --
> Sean Paul, Software Engineer, Google / Chromium OS

Patch
diff mbox

diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
index 960da7f..eda26dd 100644
--- a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
@@ -17,7 +17,9 @@  Required properties:
 
 Optional properties:
  - extcon : extcon specifier for the Power Delivery
-
+ - rockchip,phy_config : That's phy voltage swing and pre_emphasis
+			 setting, if want to do dp training outside
+			 dp firmware, need to add these value.
 Required nodes : a sub-node is required for each port the phy provides.
 		 The sub-node name is used to identify dp or usb3 port,
 		 and shall be the following entries: