Re: [PATCH 2/5] phy: core: Define TBT phy_mode

[Dmitry Baryshkov]

On Mon, May 18, 2026 at 12:29:49PM +0200, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> 
> There exist OS-accessible USB4 and Thunderbolt PHYs that need specific
> configuration. Define a new phy_mode for them.
> 
> Currently, USB4 and TBT3 are defined as submodes, because they're quite
> distinct, most visibly in the electrical/analog aspects (slightly
> different frequencies, timings, etc.). This results in a need to make
> the PHY aware of the actual mode needed (at least in the Qualcomm
> implementation, but I believe that'll be a general need).
> 
> Newer versions of TBT are basically supersets of USB4 with higher
> host-side requirements, so these are not defined. This can always be
> changed as necessary.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> ---
>  include/linux/phy/phy-tbt.h | 14 ++++++++++++++
>  include/linux/phy/phy.h     |  2 ++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/include/linux/phy/phy-tbt.h b/include/linux/phy/phy-tbt.h
> new file mode 100644
> index 000000000000..5f48059814e1
> --- /dev/null
> +++ b/include/linux/phy/phy-tbt.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +#ifndef __PHY_TBT_H_
> +#define __PHY_TBT_H_
> +
> +enum tbt_phy_submode {
> +	PHY_SUBMODE_TBT3,
> +	PHY_SUBMODE_USB4,

Do we need TBT2 as a separate submode?

Other than that:


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>



> +};

-- 
With best wishes
Dmitry