linux-kernel - Re: [PATCH v12 4/6] i2c: tegra: Add HS mode support

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Message-ID: <926d94d9-0719-4ade-910b-6042a2a8171b@nvidia.com>
Date: Tue, 18 Nov 2025 12:25:27 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Akhil R <akhilrajeev@...dia.com>, andi.shyti@...nel.org,
 digetx@...il.com, linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-tegra@...r.kernel.org, thierry.reding@...il.com,
 wsa+renesas@...g-engineering.com, wsa@...nel.org
Cc: kkartik@...dia.com, ldewangan@...dia.com, smangipudi@...dia.com
Subject: Re: [PATCH v12 4/6] i2c: tegra: Add HS mode support

On 15/11/2025 04:26, Akhil R wrote:
> Add support for HS (High Speed) mode transfers, which is supported by
> Tegra194 onwards. Also adjust the bus frequency such that it uses the
> fast plus mode when HS mode is not supported.

Technically, Tegra20 supported HS mode (according to the documentation). 
However, from what I have found, it appears that HS mode only works on 
Tegra194+ devices. So Thierry suggested that we document that HS is 
broken on devices prior to Tegra194.

So the variable 'has_hs_mode_support' is a bit misleading. It might be 
better to change this to 'hs_mode_broken' and reverse the logic.

Jon

-- 
nvpublic