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

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Message-Id: <E1CFF612-FB5B-4DBA-A45E-5B1E658D70F8@holtmann.org>
Date:   Thu, 18 Aug 2016 19:31:05 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sebastian Reichel <sre@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Peter Hurley <peter@...leysoftware.com>,
        NeilBrown <neil@...wn.name>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-bluetooth@...r.kernel.org" <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 Linus,

>> Currently, devices attached via a UART are not well supported in the
>> kernel. The problem is the device support is done in tty line disciplines,
>> various platform drivers to handle some sideband, and in userspace with
>> utilities such as hciattach.
> 
> Freaking *awesome* Rob, this really really needs to happen.
> I'm very happy that you're driving this.
> 
>> This is functional with minimal testing using the loopback driver and
>> pl011 (w/o DMA) UART under QEMU (modified to add a DT node for the slave
>> device). It still needs lots of work and polish.
> 
> I have Bluetooth (HCI) over UART on the Nomadik and Ux500,
> both with DMA support for the PL011 too. So I hope to be able
> to utilize this.
> 
> (The HCI transport is then used for GPS, FM radio and whatnot
> but that is another issue.)

that is something we can already solve via regmap. We have started work on Intel LnP which also includes a FM radio chip where registers/interrupts are exposed via HCI commands/events. So fundamentally the Bluetooth HCI device would expose the GPS and FM radio nodes via regmap.

Regards

Marcel