linux-kernel - Re: [5/5] i2c: davinci: use ICPFUNC to toggle I2C as gpio for bus recovery

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Message-ID: <20141124194533.GU4431@pengutronix.de>
Date:	Mon, 24 Nov 2014 20:45:33 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Murali Karicheri <m-karicheri2@...com>,
	Ben Gardiner <bengardiner@...ometrics.ca>,
	Mike Looijmans <milo-software@...rs.sourceforge.net>
Subject: Re: [5/5] i2c: davinci: use ICPFUNC to toggle I2C as gpio for bus
 recovery

Hi Grygorii,

On Mon, Nov 24, 2014 at 03:15:58PM +0200, Grygorii Strashko wrote:
> On 11/23/2014 07:04 PM, Uwe Kleine-König wrote:
> > On Thu, Nov 20, 2014 at 12:03:08PM +0200, Grygorii Strashko wrote:
> >> @@ -664,6 +759,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
> >>   		if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency",
> >>   			&prop))
> >>   			dev->pdata->bus_freq = prop / 1000;
> >> +		dev->pdata->has_pfunc = true;
> > I don't understand this. Why does this ICPFUNC recovery work if the bus
> > is probed by oftree, but doesn't if not?
> 
> I've mentioned this in commit message:
>  Allow platforms to indicate the presence of the ICPFUNC registers with a has_pfunc
>  platform data flag and enable this mode for platforms which supports DT (da850 and
>  Keystone 2 are two SoCs which support DT now and they also support ICPFUNC registers).
Ah, so you assume that in the dt case the pfunc functionality is
available. I didn't understand if it's bad or not if this assumption is
wrong, but I suggest to only use the pfunc stuff if the device node has
a given property (e.g. ti,has_pfunc).

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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