archive mirror
 help / color / mirror / Atom feed
From: Quan Nguyen <>
	Andrew Jeffery <>,,
	"Thang Q . Nguyen" <>,,
	Phong Vo <>,
	Wolfram Sang <>, Rob Herring <>,
	Philipp Zabel <>,,
	Open Source Submission <>,,
Subject: Re: [PATCH v2 0/3] Add Aspeed SSIF BMC driver
Date: Wed, 7 Apr 2021 20:09:50 +0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Corey,

Thank you for reviewing
I'll put my respond inline below.


On 02/04/2021 21:21, Corey Minyard wrote:
> On Tue, Mar 30, 2021 at 09:10:26PM +0700, Quan Nguyen wrote:
>> This series add support for the Aspeed specific SSIF BMC driver which
>> is to perform in-band IPMI communication with the host in management
>> (BMC) side.
> I don't have any specific feedback for this, but I'm wondering if it's
> really necessary.
> Why can't the BMC just open the I2C device and use it?  Is there any
> functionality that this provides that cannot be accomplished from
> userland access to the I2C device?  I don't see any.
> If it tied into some existing framework to give abstract access to a BMC
> slave side interface, I'd be ok with this.  But I don't see that.

The SSIF at the BMC side acts as an I2C slave and we think that the 
kernel driver is unavoidable to handle the I2c slave events 

And to make it works with existing OpenBMC IPMI stack, a userspace part, 
ssifbridge, is needed ( This 
ssifbridge is to connect this driver with the OpenBMC IPMI stack so the 
IPMI stack can communicate via SSIF channel in similar way that was 
implemented with BT and KCS (ie: btbridge/kcsbridge and its corespondent 
kernel drivers ( and

> Unless there is a big need to have this in the kernel, I'm against
> including this and would suggest you do all this work in userland.
> Perhaps write a library.  Sorry, but I'm trying to do my part to reduce
> unnecessary things in the kernel.
> Thanks,
> -corey

  reply	other threads:[~2021-04-07 13:10 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30 14:10 [PATCH v2 0/3] Add Aspeed SSIF BMC driver Quan Nguyen
2021-03-30 14:10 ` [PATCH v2 1/3] i2c: i2c-core-smbus: Expose PEC calculate function for generic use Quan Nguyen
2021-03-30 14:10 ` [PATCH v2 2/3] drivers: char: ipmi: Add Aspeed SSIF BMC driver Quan Nguyen
2021-04-02 12:01   ` Philipp Zabel
2021-04-07  7:23     ` Quan Nguyen
2021-04-07 15:50   ` Corey Minyard
2021-04-22 10:49   ` Graeme Gregory
2021-03-30 14:10 ` [PATCH v2 3/3] bindings: ipmi: Add binding for " Quan Nguyen
2021-04-01 17:09   ` Rob Herring
2021-04-02  1:59     ` Quan Nguyen
2021-04-02 14:21 ` [PATCH v2 0/3] Add " Corey Minyard
2021-04-07 13:09   ` Quan Nguyen [this message]
2021-04-07 14:28     ` Corey Minyard

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).