linux-kernel - Re: [PATCH -mm] Blackfin: blackfin i2c driver

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Message-ID: <4e5ebad50703082004s6cd34ccbp34e6f8b2c2273389@mail.gmail.com>
Date:	Fri, 9 Mar 2007 12:04:59 +0800
From:	"Sonic Zhang" <sonic.adi@...il.com>
To:	"Jean Delvare" <khali@...ux-fr.org>
Cc:	"Bryan Wu" <bryan.wu@...log.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Alexey Dobriyan" <adobriyan@...il.com>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org, mhfan@...c.edu
Subject: Re: [PATCH -mm] Blackfin: blackfin i2c driver

On 3/8/07, Jean Delvare <khali@...ux-fr.org> wrote:
> Hi Brian,
>
> Thanks for the quick update.

> > +
> > +     rc = (iface->result >= 0) ? 0 : -1;
> > +
> > +     /* Release mutex */
> > +     mutex_unlock(&iface->twi_lock);
> > +
> > +     return rc;
> > +}
>
> i2c-core can emulate SMBus transactions using master_xfer, so in
> general when you have a complete master_xfer implementation you do not
> need to define a separate smbus_xfer function. This would save a lot of
> code.
>

Actually the i2c-core can't emulate SMBus transactions using the
master_xfer function, because the blackfin TWI controller provide
hardware support to the SMBus transactions and the combination of
master_xfer operations can't generate proper signal for SMBus.
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