linux-kernel - Re: [PATCHv3 2/6] mailbox: Introduce a new common API

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Message-Id: <95FE2F33-B9C5-4F24-B639-3F1D42EFD1E1@codeaurora.org>
Date:	Tue, 18 Feb 2014 15:32:37 -0600
From:	Kumar Gala <galak@...eaurora.org>
To:	Jassi Brar <jassisinghbrar@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, s-anna@...com,
	tony@...mide.com, omar.ramirez@...itl.com, loic.pallardy@...com,
	lftan.linux@...il.com, slapdau@...oo.com.au,
	courtney.cavin@...ymobile.com, rafael.j.wysocki@...el.com,
	Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCHv3 2/6] mailbox: Introduce a new common API


On Feb 15, 2014, at 12:25 PM, Jassi Brar <jassisinghbrar@...il.com> wrote:

> Introduce common framework for client/protocol drivers and
> controller drivers of Inter-Processor-Communication (IPC).
> 
> Client driver developers should have a look at
> include/linux/mailbox_client.h to understand the part of
> the API exposed to client drivers.
> Similarly controller driver developers should have a look
> at include/linux/mailbox_controller.h
> 
> Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
> ---
> drivers/mailbox/Makefile           |   4 +
> drivers/mailbox/mailbox.c          | 534 +++++++++++++++++++++++++++++++++++++
> include/linux/mailbox.h            |  17 ++
> include/linux/mailbox_client.h     |  87 ++++++
> include/linux/mailbox_controller.h | 102 +++++++
> 5 files changed, 744 insertions(+)
> create mode 100644 drivers/mailbox/mailbox.c
> create mode 100644 include/linux/mailbox.h
> create mode 100644 include/linux/mailbox_client.h
> create mode 100644 include/linux/mailbox_controller.h

What’s the intent of trying to provide a unified interface here?  I’m trying to understand what benefit we are going for, I get possibly wanting something to reduce duplication in drivers (help functions, library, etc).  But do we really see benefit in a common interface for clients?

Are we really going to mix a OMAP mailbox controller with a client developed for some other SoC vendor?

- k

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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