linux-kernel - Re: [RFCv3 2/7] mfd: twl4030-madc: Add DT support and convert to IIO framework

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Date:	Wed, 26 Feb 2014 09:26:59 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Sebastian Reichel <sre@...ian.org>
Cc:	Sebastian Reichel <sre@...g0.de>,
	Marek Belisko <marek@...delico.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	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>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: Re: [RFCv3 2/7] mfd: twl4030-madc: Add DT support and convert to IIO
 framework

> This converts twl4030-madc module to use the Industrial IO ADC
> framework and adds device tree support.
> 
> Signed-off-by: Sebastian Reichel <sre@...ian.org>
> ---
>  drivers/mfd/twl4030-madc.c | 122 ++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 115 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
> index 5458561..81484ee 100644
> --- a/drivers/mfd/twl4030-madc.c
> +++ b/drivers/mfd/twl4030-madc.c
> @@ -47,6 +47,8 @@
>  #include <linux/gfp.h>
>  #include <linux/err.h>
>  
> +#include <linux/iio/iio.h>
> +
>  /*
>   * struct twl4030_madc_data - a container for madc info
>   * @dev - pointer to device structure for madc
> @@ -59,10 +61,74 @@ struct twl4030_madc_data {
>  	struct device *dev;
>  	struct mutex lock;	/* mutex protecting this data structure */
>  	struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
> +	bool use_second_irq;

This should go into the same patch that adds the header doc, or visa
versa.

>  	int imr;
>  	int isr;
>  };
>  
> +static int twl4030_madc_read(struct iio_dev *iio_dev,
> +			     const struct iio_chan_spec *chan,
> +			     int *val, int *val2, long mask)
> +{
> +	struct twl4030_madc_data *madc = iio_priv(iio_dev);
> +	struct twl4030_madc_request req;
> +	int channel = chan->channel;

Does this really add anything you save 6 chars.

<snip>

>  	/*
>  	 * Phoenix provides 2 interrupt lines. The first one is connected to
>  	 * the OMAP. The other one can be connected to the other processor such
>  	 * as modem. Hence two separate ISR and IMR registers.
>  	 */
> -	madc->imr = (pdata->irq_line == 1) ?
> +	if (pdata)
> +		madc->use_second_irq = pdata->irq_line != 1;

Unconventional an unclear.

Stick the comparison in the if statement.

> +	else
> +		madc->use_second_irq = of_property_read_bool(np,
> +				       "ti,system-uses-second-madc-irq");
> +
> +	madc->imr = (madc->use_second_irq == 1) ?

madc->imr = madc->use_second_irq ? <blah> : <blah>;

>  	    TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
> -	madc->isr = (pdata->irq_line == 1) ?
> +	madc->isr = (madc->use_second_irq == 1) ?

Same here.

<snip>

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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