linux-kernel - Re: [PATCH 10/10] Bluetooth: add nokia driver

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Message-Id: <65D9766C-9BED-42D5-931C-65044530E215@holtmann.org>
Date:   Tue, 7 Mar 2017 22:20:27 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/10] Bluetooth: add nokia driver

Hi Sebastian,

>>> This adds a driver for the Nokia H4+ protocol, which is used
>>> at least on the Nokia N9, N900 & N950.
>>> 
>>> Signed-off-by: Sebastian Reichel <sre@...nel.org>
>>> ---
>>> .../devicetree/bindings/net/nokia-bluetooth.txt    |  51 ++
>> 
>> This should be separate and before the dts files.
>> 
>>> drivers/bluetooth/Kconfig                          |  12 +
>>> drivers/bluetooth/Makefile                         |   2 +
>>> drivers/bluetooth/hci_nokia.c                      | 839 +++++++++++++++++++++
>>> 4 files changed, 904 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/net/nokia-bluetooth.txt
>>> create mode 100644 drivers/bluetooth/hci_nokia.c
>>> 
>>> diff --git a/Documentation/devicetree/bindings/net/nokia-bluetooth.txt b/Documentation/devicetree/bindings/net/nokia-bluetooth.txt
>>> new file mode 100644
>>> index 000000000000..6c80a92f31e2
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/net/nokia-bluetooth.txt
>>> @@ -0,0 +1,51 @@
>>> +Nokia Bluetooth Chips
>>> +---------------------
>>> +
>>> +Nokia phones often come with UART connected bluetooth chips from different
>>> +vendors and modified device API. Those devices speak a protocol named H4+
>>> +by Nokia, which is similar to the H4 protocol from the Bluetooth standard.
>>> +In addition to the H4 protocol it specifies two more UART status lines for
>>> +wakeup of UART transceivers to improve power management and a few new packet
>>> +types used to negotiate uart speed.
>>> +
>>> +Required properties:
>>> +
>>> + - compatible: should be one of the following:
>>> +   * "nokia,brcm,bcm2048"
>>> +   * "nokia,ti,wl1271-bluetooth"
>> 
>> Drop the chip vendors' prefix here. I don't really want to start a
>> pattern of 2 vendor prefixes.
> 
> Right, I think we discussed this before, but I don't remember the
> result. How about
> 
> - compatible: should contain "nokia,h4p-bluetooth" as well as one of the following:
> * "brcm,bcm2048-nokia"
> * "ti,wl1271-blueooth-nokia”

I never liked the term “h4p”. It is fundamentally just “bluetooth”. What are our plans for Broadcom, Intel etc. Bluetooth UARTs?

Regards

Marcel