linux-kernel - Re: [PATCH v1] Bluetooth: Add hci_nxp BT submodule with controller Power Save feature for NXP BT chipsets.

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Date:   Wed, 16 Nov 2022 15:26:43 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        amitkumar.karwar@....com, rohit.fule@....com, sherry.sun@....com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH v1] Bluetooth: Add hci_nxp BT submodule with controller
 Power Save feature for NXP BT chipsets.

Dear Neeraj,


Thank you for your patch.


Am 16.11.22 um 17:42 schrieb Neeraj Sanjay Kale:

Please remove the dot/period at the end of the summary/subject line.

> Added proprietary hci_uart driver code to the linux hci uart sub-system as

Please use present tense: Add

“proprietary … code” sounds strange, as Linux is FLOSS. Please clarify.

> hci_nxp. This driver has Power Save feature that will put the NXP bluetooth
> chip into sleep state, whenever there is no activity for certain duration
> of time (2000ms), and will be woken up when any activity is to be
> initiated.
> 
> This Power Save feature will be enabled by default and can be disabled and
> re-enabled by the following set of commands:
> hcitool -i hci0 cmd 3F 23 02 00 00    (disable Power Save)
> hcitool -i hci0 cmd 3F 23 03 00 00    (enable Power Save)
> 
> The Power Save feature uses UART break signal by default as chip sleep and
> wake-up source, and can be set with the following set of commands:
> hcitool -i hci0 cmd 3F 53 03 14 01 FF    (set UART break method)
> hcitool -i hci0 cmd 3F 53 03 14 02 15    (set chip's GPIO[20] method)

Please mention the datasheet, and how you tested the driver.

> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
> ---
>   MAINTAINERS                   |   6 +
>   drivers/bluetooth/Kconfig     |  10 +
>   drivers/bluetooth/Makefile    |   1 +
>   drivers/bluetooth/hci_ldisc.c |   6 +
>   drivers/bluetooth/hci_nxp.c   | 763 ++++++++++++++++++++++++++++++++++++++++++
>   drivers/bluetooth/hci_nxp.h   | 118 +++++++
>   drivers/bluetooth/hci_uart.h  |   8 +-
>   7 files changed, 911 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/bluetooth/hci_nxp.c
>   create mode 100644 drivers/bluetooth/hci_nxp.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e55a4d4..6b2c264 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22591,6 +22591,12 @@ L:	linux-mm@...ck.org
>   S:	Maintained
>   F:	mm/zswap.c
>   
> +NXP BLUETOOTH WIRELESS DRIVERS
> +M:	amitkumar.karwar@....com
> +M:	neeraj.sanjaykale@....com

Mentioning a mailing list, and maybe setting up a functional address, 
would be nice (nxp-bluetooth-wireless-linux-driver@....com).

> +S:	Maintained
> +F:	drivers/bluetooth/hci_nxp*
> +
>   THE REST
>   M:	Linus Torvalds <torvalds@...ux-foundation.org>
>   L:	linux-kernel@...r.kernel.org

[…]


Kind regards,

Paul