linux-kernel - Re: [PATCH] bluetooth: remove wrong dependency for BT

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Date:	Tue, 30 Jul 2013 09:58:38 +0200
From:	Hector Palacios <hector.palacios@...i.com>
To:	Marcel Holtmann <marcel@...tmann.org>
CC:	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"gustavo@...ovan.org" <gustavo@...ovan.org>,
	"johan.hedberg@...il.com" <johan.hedberg@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<lrodriguez@...eros.com>, "suraj@...eros.com" <suraj@...eros.com>
Subject: Re: [PATCH] bluetooth: remove wrong dependency for BT_ATH3K

Hi Marcel,

On 07/29/2013 06:43 PM, Marcel Holtmann wrote:
> Hi Hector,
>
>> The Atheros firmware download driver is not dependent on HCI
>> USB driver. This driver is needed to complement any Atheros
>> driver like BT_HCIUART_ATH3K.
>>
>> Signed-off-by: Hector Palacios <hector.palacios@...i.com>
>> CC: Suraj Sumangala <suraj@...eros.com>
>> CC: Vikram Kandukuri <vikram.kandukuri@...eros.com>
>> ---
>> drivers/bluetooth/Kconfig | 1 -
>> 1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
>> index 11a6104..a1d482b 100644
>> --- a/drivers/bluetooth/Kconfig
>> +++ b/drivers/bluetooth/Kconfig
>> @@ -222,7 +222,6 @@ config BT_MRVL_SDIO
>>
>> config BT_ATH3K
>> 	tristate "Atheros firmware download driver"
>> -	depends on BT_HCIBTUSB
>> 	select FW_LOADER
>> 	help
>> 	  Bluetooth firmware download driver.
>>
>
> I am confused now. How can an USB driver work with an UART driver? If you do not want to depend on BT_HCIBTUSB then that is fine, but at least you need to depend on USB.

The thing is I have an Atheros AR6233 chipset which has wireless and Bluetooth. 
Bluetooth part in this chip operates as a UART. The driver for this is hci_ath.c but I 
also need to download the firmware to the chip, and for this I need to compile 
ath3k.c. However I don't need BT_HCIBTUSB.
But you are right, looking at the source code of ath3k.c it is calling usb commands, 
so it needs to depend on USB at least.

This brings an interesting question: shouldn't the firmware download part be isolated 
from the USB driver? After all, I want to communicate with a UART bluetooth chip.

Best regards,
--
Hector Palacios
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