On 11/03/2022 13:09, Neumann, Bastian wrote:
> This patch adds devicetree documentation for signal boosting properties.
>
> Signed-off-by: Bastian Neumann <bastian.neumann@xxxxxxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/usb/usb251xb.txt | 22 +++++++++++++++++++
This looks familiar... is it a v2?
> 1 file changed, 22 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/usb/usb251xb.txt b/Documentation/devicetree/bindings/usb/usb251xb.txt
> index 1a934eab175e..538ae49fc31d 100644
> --- a/Documentation/devicetree/bindings/usb/usb251xb.txt
> +++ b/Documentation/devicetree/bindings/usb/usb251xb.txt
> @@ -68,6 +68,26 @@ Optional properties :
> - swap-dx-lanes : Specifies the ports which will swap the differential-pair
> (D+/D-), default is not-swapped.
>
> +Electrical signal boosting
> +The controller supplies a "boosting" functionality to drive up the USB
> +electrical signals. This could result in non-USB compliant parameters
> +(one example would be J/K level test). This should be <0x00> unless specific
> +implementation issues requiew additional signal boosting to correct for deraded
> +USB signaling levels:
> + - <0x00> : Normal electrical drive strength (no boost)
> + - <0x01> : Elevated drive strength low (~4% boost)
> + - <0x02> : Elevated drive strength medium (~8% boost)
> + - <0x03> : Elevated drive strength high (~12% boost)
> +
> + - boost-up : USB electrical signaling drive strength boost for upstream port.
> + - boost-1 : USB electrical signaling drive strength boost for port 1.
> + - boost-2 : USB electrical signaling drive strength boost for port 2.
> + - boost-3 : USB electrical signaling drive strength boost for port 3.
> + - boost-4 : USB electrical signaling drive strength boost for port 4.
> + - boost-5 : USB electrical signaling drive strength boost for port 5.
> + - boost-6 : USB electrical signaling drive strength boost for port 6.
> + - boost-7 : USB electrical signaling drive strength boost for port 7.
> +
> Examples:
> usb2512b@2c {
> compatible = "microchip,usb2512b";
> @@ -86,4 +106,6 @@ Examples:
> serial = "1234567890A";
> /* correct misplaced usb connectors on port 1,2 */
> swap-dx-lanes = <1 2>;
> + boost-up = <0x00>; /* no boost for upstream port */
> + boost-1 = <0x02>; /* medium boost on port 1 */
> };
> --
> 2.30.2
>
>
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Please drop it. Since I am not on recipients list one could think I am
not designated recipient. This defeats entire purpose of public discussion.
Instead to public lists emails which are entirely public.
Best regards,
Krzysztof
