linux-kernel - Re: [PATCH v5 15/15] misc: bcm-vk: add ttyVK support

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Message-ID: <278afb05-8c8d-98d2-eed0-f73b954b03c7@gmail.com>
Date:   Wed, 30 Sep 2020 19:36:19 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Olof Johansson <olof@...om.net>
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v5 15/15] misc: bcm-vk: add ttyVK support



On 9/30/2020 6:28 PM, Scott Branden wrote:
> Add ttyVK support to driver to allow console access to VK card from host.
> 
> Device node will be in the follow form /dev/bcm-vk.x_ttyVKy where:
> x is the instance of the VK card
> y is the tty device number on the VK card
> 
> Signed-off-by: Scott Branden <scott.branden@...adcom.com>

Was it not possible to:

- emulate a standard 8250 UART and just expose an additional bar + MSI 
vector such that one could get a debug UART out of this device with 
little to no work on the host side?

- or use virtio console and implement virtio on the firmware that runs 
on VK?

It's not a lot of code, but it just feels like this should not have to 
be done at all.
-- 
Florian