linux-kernel - Re: [PATCH v7 0/2] i2c: sunxi: add P2WI controller support

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Message-ID: <20140611222444.GB3109@katana>
Date:	Thu, 12 Jun 2014 00:24:44 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	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: [PATCH v7 0/2] i2c: sunxi: add P2WI controller support

On Wed, Jun 11, 2014 at 11:17:28AM +0200, Boris BREZILLON wrote:
> Hello,
> 
> This series adds support for the P2WI block used by some Allwinner boards
> to interface with the AXP221 PMIC.
> 
> The P2WI controller 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 write
>   followed by a read access in standard SMBus protocol)
> - there's no Ack bit after each byte transfer
> 
> This means this bus cannot be used to interface with standard SMBus
> devices (the only known device to support this interface is the AXP221
> PMIC).
> However the P2WI protocol is close enough to SMBus to be integrated in
> the I2C subsystem (see this thread [1] for detailed reasons that led to
> integrating this driver in the I2C subsystem).
> 
> [1] http://www.spinics.net/lists/linux-i2c/msg15066.html

Applied to for-next, thanks!


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