linux-kernel - Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

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Message-ID: <20150115163235.GQ22880@pengutronix.de>
Date:	Thu, 15 Jan 2015 17:32:35 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Ray Jui <rjui@...adcom.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Matt Porter <mporter@...aro.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Scott Branden <sbranden@...adcom.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

Hello,

On Thu, Jan 15, 2015 at 01:07:05PM +0100, Wolfram Sang wrote:
> > > +	iproc_i2c->msg = msg;
> > Can it happen that iproc_i2c->msg still holds an uncompleted message
> > here or is this serialized by the core? Wolfram? Either here something
> 
> We have per-adapter locks serializing transfers, if you mean that?
ok, so in the efm32 driver the if (ddata->msgs) condition in
efm32_i2c_master_xfer can never be true, right?

> > > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > > +{
> > > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > > +
> > > +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
calling devm_free_irq would work or writel(0, iproc_i2c->base +
IE_OFFSET) + synchronize_irq().

Best regards
Uwe

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