linux-kernel - Re: [RFC V1 2/3] mfd: da9063: Add HWMON dependencies

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Date:	Mon, 24 Mar 2014 08:02:59 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	"Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	David Dajun Chen <david.chen@...semi.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.de>,
	LINUX-DOC <linux-doc@...r.kernel.org>,
	LINUX-KERNEL <linux-kernel@...r.kernel.org>,
	LM-SENSORS <lm-sensors@...sensors.org>,
	Mark Brown <broonie@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Rob Landley <rob@...dley.net>
Subject: Re: [RFC V1 2/3] mfd: da9063: Add HWMON dependencies

On Sun, 23 Mar 2014, Opensource [Steve Twiss] wrote:

> From: Opensource [Steve Twiss] <stwiss.opensource@...semi.com>
> 
> Dependencies required for DA9063 HWMON support.
> 
> Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@...semi.com>
> ---
> 
>  drivers/mfd/da9063-core.c        |   13 ++++++++++++-
>  include/linux/mfd/da9063/core.h  |    3 +++
>  include/linux/mfd/da9063/pdata.h |   18 ++++++++++++++++++
>  3 files changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c
> index e70ae31..24c1838 100644
> --- a/drivers/mfd/da9063-core.c
> +++ b/drivers/mfd/da9063-core.c
> @@ -111,6 +111,7 @@ int da9063_device_init(struct da9063 *da9063, unsigned int irq)
>  {
>  	struct da9063_pdata *pdata = da9063->dev->platform_data;
>  	int model, variant_id, variant_code;
> +	int t_offset = 0;
>  	int ret;
>  
>  	if (pdata) {
> @@ -171,8 +172,18 @@ int da9063_device_init(struct da9063 *da9063, unsigned int irq)
>  	ret = mfd_add_devices(da9063->dev, -1, da9063_devs,
>  			      ARRAY_SIZE(da9063_devs), NULL, da9063->irq_base,
>  			      NULL);
> -	if (ret)
> +	if (ret) {
>  		dev_err(da9063->dev, "Cannot add MFD cells\n");
> +		return ret;
> +	}
> +
> +	ret = regmap_read(da9063->regmap, DA9063_REG_T_OFFSET, &t_offset);
> +	if (ret < 0)
> +		dev_warn(da9063->dev,
> +			 "Temperature trimming value cannot be read (defaulting to 0)\n");
> +
> +	/* pass this on to the hwmon driver */
> +	da9063->t_offset = t_offset;

What's the logic for using a local variable for this prior to setting
the attribute in the shared container?

>  	return ret;
>  }
> diff --git a/include/linux/mfd/da9063/core.h b/include/linux/mfd/da9063/core.h
> index 00a9aac..7327d37 100644
> --- a/include/linux/mfd/da9063/core.h
> +++ b/include/linux/mfd/da9063/core.h
> @@ -86,6 +86,9 @@ struct da9063 {
>  	int		chip_irq;
>  	unsigned int	irq_base;
>  	struct regmap_irq_chip_data *regmap_irq;
> +
> +	/* Trimming */
> +	int		t_offset;
>  };
>  
>  int da9063_device_init(struct da9063 *da9063, unsigned int irq);
> diff --git a/include/linux/mfd/da9063/pdata.h b/include/linux/mfd/da9063/pdata.h
> index 95c8742..576033e 100644
> --- a/include/linux/mfd/da9063/pdata.h
> +++ b/include/linux/mfd/da9063/pdata.h
> @@ -62,6 +62,23 @@ struct da9063_regulators_pdata {
>  	struct da9063_regulator_data	*regulator_data;
>  };
>  
> +/* HWMON platform data */
> +#define DA9063_SET_ADCIN1_CUR_1UA	0x00
> +#define DA9063_SET_ADCIN1_CUR_2UA	0x01
> +#define DA9063_SET_ADCIN1_CUR_10UA	0x02
> +#define DA9063_SET_ADCIN1_CUR_40UA	0x03
> +#define DA9063_SET_ADCIN2_CUR_1UA	0x00
> +#define DA9063_SET_ADCIN2_CUR_2UA	0x01
> +#define DA9063_SET_ADCIN2_CUR_10UA	0x02
> +#define DA9063_SET_ADCIN2_CUR_40UA	0x03
> +#define DA9063_SET_ADCIN3_CUR_10UA	0x00

Why differentiate? More succinctly:

/* HWMON platform data */
#define DA9063_SET_CUR_1UA	0x00
#define DA9063_SET_CUR_2UA	0x01
#define DA9063_SET_CUR_10UA	0x02
#define DA9063_SET_CUR_40UA	0x03


> +struct da9063_hwmon_pdata {
> +	unsigned char adcin1_cur;
> +	unsigned char adcin2_cur;
> +	unsigned char adcin3_cur;
> +};
> +
>  

Now there are two new lines here.

>  /*
>   * RGB LED configuration
> @@ -106,6 +123,7 @@ struct da9063_pdata {
>  	unsigned			flags;
>  	struct da9063_regulators_pdata	*regulators_pdata;
>  	struct led_platform_data	*leds_pdata;
> +	struct da9063_hwmon_pdata	*hwmon_pdata;
>  };

Does this device support Device Tree?

>  #endif	/* __MFD_DA9063_PDATA_H__ */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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