linux-kernel - Re: [RFC 02/11] i2c: add quirk checks to core

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Date:	Mon, 12 Jan 2015 11:13:49 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-mips@...ux-mips.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 02/11] i2c: add quirk checks to core


> I am not sure it will perfectly fit at91 quirks.

I think it does.

> The hardware can handle two messages by using the internal address
> feature. The internal address size is from one byte to three bytes. Then
> the length of the first message is limited to three but we don't have
> this constraint for the second one. If we have 'write then read' no problem
> but if we have two write messages, the second one will cause a quirk
> exceeded error.

Yeah, for this reason I seperated I2C_ADAPTER_QUIRK_COMB_WRITE_FIRST
out. The first message is checked against max_comb_write_len which is
set to 3 for your driver. The second is checked agains max_write_len
which is unset in your driver and thus can be of any length.

That should work, no?


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