linux-kernel - Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

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Message-ID: <0446c62c2d4a2c60442c582b4f61f5d3.squirrel@www.codeaurora.org>
Date:	Tue, 16 Aug 2011 10:44:35 -0700 (PDT)
From:	sdharia@...eaurora.org
To:	"Kenneth Heitke" <kheitke@...eaurora.org>
Cc:	"Arnd Bergmann" <arnd@...db.de>,
	"David Brown" <davidb@...eaurora.org>,
	"Mark Brown" <broonie@...nsource.wolfsonmicro.com>,
	bryanh@...eaurora.org, linux-arm-msm@...r.kernel.org,
	"Sagar Dharia" <sdharia@...eaurora.org>, rdunlap@...otime.net,
	rmk+kernel@....linux.org.uk, john.stultz@...aro.org,
	akpm@...ux-foundation.org, ohad@...ery.com, gregkh@...e.de,
	stefanr@...6.in-berlin.de, lethal@...ux-sh.org,
	linville@...driver.com, zajec5@...il.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

>>
>>> Kenneth would better be able to clarify how dynamic the SLIMbus is.
>>
>> That would definitely be helpful. Also, I'd be very interested to hear
>> what kind of device probing is available on slimbus. If Mark was
>> right about devices being discoverable, we need don't need any board
>> description (dts or hardcoded) but instead a way to match the devices
>> to drivers based on their HW ID.
>>
>> 	Arnd
>>
>
> SLIMbus is a MIPI standard bus primarily used for digital audio devices.
>   The devices on the bus SLIMbus enumerate themselves by sending an
> IDENTITY message.  I'll let Sagar clarify further.

Thanks everyone for taking your time to review the RFC.
Regarding device discovery:
Every device sends a "PRESENT" message when it comes up. Every device has
48-bit address like Ethernet and spec lets upto 256 devices (each getting
8-bit logical address) on one bus.
The device can report anytime (when it's plugged in, when a dynamic module
powers it on etc.)
Typical use case will be to have it board-specific but as Mark
mentioned,we may have plug-in cards with slimbus devices so we want
dynamic support as well.

Thanks-
-Sagar

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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