linux-kernel - Re: [RFC PATCH 0/3] UART slave device bus

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Date:   Wed, 24 Aug 2016 10:29:58 -0400
From:   Marcel Holtmann <marcel@...tmann.org>
To:     One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:     Sebastian Reichel <sre@...nel.org>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Hurley <peter@...leysoftware.com>,
        NeilBrown <neil@...wn.name>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] UART slave device bus

Hi Alan,

>> So you mean if I do "hciconfig hci0 down", then the uart-bus should
>> "down" the tty and only on "hciconfig hci0 up" it should "up" the
>> tty? I would expect a uart-bus slave-device takes control of the
>> device ("up" it) on probe. It's hardwired anyway.
> 
> Today you can switch stacks at runtime, you can switch between the kernel
> stack and debug tools at runtime. Breaking that is a regression.

actually that is not true. We have HCI User Channel since a long time that gives you raw access to the devices. And also kernel interfaces to do all vendor / debug tasks.

Regards

Marcel