Re: [PATCH v3 2/5] phy: core: Define TBT phy_mode

From: Vinod Koul <vkoul@kernel.org>
To: Konrad Dybcio <konradybcio@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	usb4-upstream@oss.qualcomm.com,
	Raghavendra Thoorpu <rthoorpu@qti.qualcomm.com>,
	Mika Westerberg <westeri@kernel.org>,
	Sven Peter <sven@kernel.org>,
	Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>,
	Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Subject: Re: [PATCH v3 2/5] phy: core: Define TBT phy_mode
Date: Tue, 11 Aug 2026 16:58:57 +0530	[thread overview]
Message-ID: <ansHeYjQASWGiAfT@vaman> (raw)
In-Reply-To: <20260730-topic-usb4phy-v3-2-ccf0f7ea98b5@oss.qualcomm.com>

On 30-07-26, 16:19, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> 
> 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.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> ---
>  include/linux/phy/phy-tbt.h | 14 ++++++++++++++

can the file be phy-thunderbolt.h please.

>  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,
> +};

tbt here is just fine

> +
> +#endif
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index ea47975e288a..26a91c070f8c 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -20,6 +20,7 @@
>  #include <linux/phy/phy-hdmi.h>
>  #include <linux/phy/phy-lvds.h>
>  #include <linux/phy/phy-mipi-dphy.h>
> +#include <linux/phy/phy-tbt.h>
>  
>  struct phy;
>  
> @@ -45,6 +46,7 @@ enum phy_mode {
>  	PHY_MODE_LVDS,
>  	PHY_MODE_DP,
>  	PHY_MODE_HDMI,
> +	PHY_MODE_TBT,
>  };
>  
>  enum phy_media {
> 
> -- 
> 2.55.0

-- 
~Vinod

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