linux-kernel - Re: [PATCH v3 2/2] i2c/of: Automatically populate i2c mux busses from device tree data.

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Message-ID: <20120422162008.GA4201@pengutronix.de>
Date:	Sun, 22 Apr 2012 18:20:08 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss@...ts.ozlabs.org,
	"Jean Delvare (PC drivers core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Peter Korsgaard <peter.korsgaard@...co.com>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	linux-i2c@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v3 2/2] i2c/of: Automatically populate i2c mux busses
 from device tree data.

On Thu, Apr 12, 2012 at 02:14:23PM -0700, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> For 'normal' i2c bus drivers, we can call of_i2c_register_devices()
> and have the device tree framework automatically populate the bus with
> the devices specified in the device tree.
> 
> This patch adds a common code to the i2c mux framework to have the mux
> sub-busses be populated by the of_i2c_register_devices() too.  If the
> mux device has an of_node, we populate the sub-bus' of_node so that
> the subsequent call to of_i2c_register_devices() will find the
> corresponding devices.
> 
> It seemed better to put this logic in i2c_add_mux_adapter() rather
> than the individual mux drivers, as they will all probably want to do
> the same thing.

Both patches looking mostly good, two things here:

> +	/*
> +	 * Try to get populate the mux adapter's of_node, expands to

"get populate"? I'd think you mean "populate" only, but am not sure
enough to fix it myself.

> +	 * nothing if !CONFIG_OF.
> +	 */
> +	if (mux_dev->of_node) {
> +		struct device_node *child;
> +		u32 reg;
> +		int ret;

We have a "ret" already in this function.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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