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From: Wolfram Sang <wsa@the-dreams.de>
To: Eddie James <eajames@linux.vnet.ibm.com>
Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, robh+dt@kernel.org,
	benh@kernel.crashing.org, joel@jms.id.au, mark.rutland@arm.com,
	gregkh@linuxfoundation.org, rdunlap@infradead.org,
	andy.shevchenko@gmail.com, peda@axentia.se
Subject: Re: [PATCH v10 5/7] i2c: fsi: Add transfer implementation
Date: Mon, 2 Jul 2018 20:24:34 +0200	[thread overview]
Message-ID: <20180702182434.5wxxszpgpf6wergl@ninjato> (raw)
In-Reply-To: <6713efb9-c4c3-f648-a1e9-7918110091e4@linux.vnet.ibm.com>

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> > > +	if (msg->flags & I2C_M_RD)
> > > +		cmd |= I2C_CMD_READ;
> > Since you support MANGLING, I'd think you can easily support
> > I2C_M_REV_DIR_ADDR here, too?
> 
> Hm, I don't really understand the purpose of that flag. From the docs:
> 
> This toggles the Rd/Wr flag. That is, if you want to do a write, but
>     need to emit an Rd instead of a Wr, or vice versa, you set this
>     flag. For example:
> S Addr Rd [A] Data [A] Data [A] ... [A] Data [A] P
> 
> I don't think our hardware supports this type of operation.

I'd think something like this should do:

	if (msg->flags & I2C_M_REV_DIR_ADDR)
		cmd ^= I2C_CMD_READ;


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  reply	other threads:[~2018-07-02 18:24 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-13 19:36 [PATCH v10 0/7] i2c: Add FSI-attached I2C master algorithm Eddie James
2018-06-13 19:36 ` [PATCH v10 1/7] dt-bindings: i2c: Add FSI-attached I2C master dt binding documentation Eddie James
2018-06-26  2:39   ` Wolfram Sang
2018-06-13 19:36 ` [PATCH v10 2/7] i2c: Add FSI-attached I2C master algorithm Eddie James
2018-06-13 19:36 ` [PATCH v10 3/7] i2c: fsi: Add port structures Eddie James
2018-06-20  3:34   ` Benjamin Herrenschmidt
2018-06-20  3:59     ` Joel Stanley
2018-06-13 19:36 ` [PATCH v10 4/7] i2c: fsi: Add abort and hardware reset procedures Eddie James
2018-06-26  2:38   ` Wolfram Sang
2018-06-27 13:48     ` Eddie James
2018-07-02 18:15       ` Wolfram Sang
2018-07-05 18:50         ` Eddie James
2018-07-05 22:06           ` Wolfram Sang
2018-06-13 19:36 ` [PATCH v10 5/7] i2c: fsi: Add transfer implementation Eddie James
2018-06-26  2:38   ` Wolfram Sang
2018-06-27 13:21     ` Eddie James
2018-07-02 18:24       ` Wolfram Sang [this message]
2018-07-05 18:52         ` Eddie James
2018-07-05 21:59           ` Wolfram Sang
2018-06-13 19:36 ` [PATCH v10 6/7] i2c: fsi: Add I2C master locking Eddie James
2018-06-13 19:36 ` [PATCH v10 7/7] i2c: fsi: Add bus recovery Eddie James
2018-06-26  2:38   ` Wolfram Sang
2018-06-27 13:32     ` Eddie James
2018-07-02 18:16       ` Wolfram Sang
2018-06-14  9:05 ` [PATCH v10 0/7] i2c: Add FSI-attached I2C master algorithm Andy Shevchenko
2018-06-18  4:53 ` Joel Stanley
2018-06-26  2:39 ` Wolfram Sang
2018-06-27 13:53   ` Eddie James

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