linux-kernel - Re: [RESEND2 PATCH v4 2/2] i2c: sunxi: add P2WI (Push/Pull 2 Wire Interface) controller support

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Message-ID: <53970CF5.50701@free-electrons.com>
Date:	Tue, 10 Jun 2014 15:49:41 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Paul Carpenter <paul@...erviceselectronics.co.uk>,
	Wolfram Sang <wsa@...-dreams.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org
Subject: Re: [RESEND2 PATCH v4 2/2] i2c: sunxi: add P2WI (Push/Pull 2 Wire
 Interface) controller support

Hello Paul,

On 10/06/2014 10:56, Paul Carpenter wrote:
> Wolfram Sang wrote:
>> On Tue, Jun 03, 2014 at 10:49:52AM +0200, Boris BREZILLON wrote:
>>> The P2WI looks like an SMBus controller which only supports byte data
>>> transfers. But, it differs from standard SMBus protocol on several
>>> aspects:
>>> - it supports only one slave device, and thus drop the address field
>>> - it adds a parity bit every 8bits of data
>>> - only one read access is required to read a byte (instead of a read
>>>   followed by a write access in standard SMBus protocol)
>
> Minor quibble should be
> "(instead of a write followed by a read access in standard SMBus
>   protocol)"
>

Fixed.

Thanks for pointing this out.

Best Regards,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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