linux-kernel - Re: [PATCH v6 2/5] phy: tegra: xusb: Add Tegra194 support

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Date:   Mon, 17 Feb 2020 09:28:48 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     JC Kuo <jckuo@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh@...nel.org, jonathanh@...dia.com,
        kishon@...com, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nkristam@...dia.com
Subject: Re: [PATCH v6 2/5] phy: tegra: xusb: Add Tegra194 support

On Wed, Feb 12, 2020 at 02:11:30PM +0800, JC Kuo wrote:
> Add support for the XUSB pad controller found on Tegra194 SoCs. It is
> mostly similar to the same IP found on Tegra186, but the number of
> pads exposed differs, as do the programming sequences. Because most of
> the Tegra194 XUSB PADCTL registers definition and programming sequence
> are the same as Tegra186, Tegra194 XUSB PADCTL can share the same
> driver, xusb-tegra186.c, with Tegra186 XUSB PADCTL.
> 
> Tegra194 XUSB PADCTL supports up to USB 3.1 Gen 2 speed, however, it
> is possible for some platforms have long signal trace that could not
> provide sufficient electrical environment for Gen 2 speed. This patch
> adds a "maximum-speed" property to usb3 ports which can be used to
> specify the maximum supported speed for any particular USB 3.1 port.
> For a port that is not capable of SuperSpeedPlus, "maximum-speed"
> property should carry "super-speed".
> 
> Signed-off-by: JC Kuo <jckuo@...dia.com>
> ---
> Changes in v6: none
> Changes in v5:
> - re-use "maximum-speed" instead of adding "nvidia,disable-gen2"
> Changes in v4: none
> Changes in v3: none
> Changes in v2:
> - removed unnecessary #if/#endif pairs
> - introduce new soc->supports_gen2 flag which indicate whether or not
>   a soc supports USB 3.1 Gen 2 speed
> 
>  drivers/phy/tegra/Makefile        |  1 +
>  drivers/phy/tegra/xusb-tegra186.c | 73 +++++++++++++++++++++++++++++++
>  drivers/phy/tegra/xusb.c          | 17 +++++++
>  drivers/phy/tegra/xusb.h          |  5 +++
>  4 files changed, 96 insertions(+)

Acked-by: Thierry Reding <treding@...dia.com>

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