linux-kernel - Re: [PATCH] iio: iadc: Qualcomm SPMI PMIC current ADC driver

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Date:	Fri, 19 Sep 2014 15:49:27 +0530
From:	Kiran Padwal <kiran.padwal@...rtplayin.com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	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>,
	Jonathan Cameron <jic23@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Hartmut Knaack <knaack.h@....de>,
	Lee Jones <lee.jones@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] iio: iadc: Qualcomm SPMI PMIC current ADC driver

Hi Ivan,

On Thursday 18 September 2014 06:45 PM, Ivan T. Ivanov wrote:
> The current ADC is peripheral of Qualcomm SPMI PMIC chips. It has
> 16 bits resolution and register space inside PMIC accessible across
> SPMI bus.
> 
> The driver registers itself through IIO interface.
> 
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
>  .../devicetree/bindings/iio/adc/qcom,spmi-iadc.txt |  61 ++

<snip>

> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 11b048a..77274e4 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -279,4 +279,15 @@ config XILINX_XADC
>  	  The driver can also be build as a module. If so, the module will be called
>  	  xilinx-xadc.
>  
> +config QCOM_SPMI_IADC
> +	tristate "Qualcomm SPMI PMIC current ADC"
> +	select REGMAP_SPMI
> +	depends on IIO

May be you need to add "SPMI" in depends on because without enabling that it breaks.

> +	help
> +	  This is the IIO Current ADC driver for Qualcomm QPNP IADC Chip.
> +
> +	  The driver supports single mode operation to read from upto seven channel
> +	  configuration that include reading the external/internal Rsense, CSP_EX,
> +	  CSN_EX pair along with the gain and offset calibration.
> +
>  endmenu

<snip>

> +
> +	return iadc_write(iadc, IADC_EN_CTL1, data);
> +}
> +
> +static void iadc_status_show(struct iadc_chip *iadc)
> +{
> +	u8 mode, sta1, chan, dig, en, req;

During compilation, getting a waring as below for all variables,

rivers/iio/adc/qcom-spmi-iadc.c: In function ‘iadc_poll_wait_eoc’:
drivers/iio/adc/qcom-spmi-iadc.c:227:10: warning: ‘en’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  dev_warn(iadc->dev,
          ^

> +	int ret;
> +
> +	ret = iadc_read(iadc, IADC_MODE_CTL, &mode);
> +	if (ret < 0)
> +		return;
> +
> +	ret = iadc_read(iadc, IADC_DIG_PARAM, &dig);

Thanks,
--Kiran

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