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

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Date:	Thu, 15 Jan 2015 13:07:05 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Uwe Kleine-König <u.kleine-koenig@...gutronix.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


> > +	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?

> > +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> > +{
> > +	unsigned int bus_speed, speed_bit;
> > +	u32 val;
> > +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> > +				       "clock-frequency", &bus_speed);
> > +	if (ret < 0) {
> > +		dev_err(iproc_i2c->device,
> > +			"missing clock-frequency property\n");
> > +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?

Default of 100kHz instead of -ENODEV sounds very reasonable.

> > +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?

Thanks for the reviews, Uwe!

   Wolfram


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