[PATCH v3 2/2] iio: adc: npcm: Add NPCM8XX support

[Jonathan Cameron]

On Wed, 13 Jul 2022 17:21:32 +0100
Jonathan Cameron <jic23 at kernel.org> wrote:

> On Wed, 13 Jul 2022 16:26:40 +0300
> Tomer Maimon <tmaimon77 at gmail.com> wrote:
> 
> > Adding ADC NPCM8XX support to NPCM ADC driver.
> > ADC NPCM8XX uses a different resolution and voltage reference.
> > 
> > As part of adding NPCM8XX support:
> > - Add NPCM8XX specific compatible string.
> > - Add data to handle architecture-specific ADC parameters.
> > 
> > Signed-off-by: Tomer Maimon <tmaimon77 at gmail.com>  
> missing 
> 
> #include <linux/property.h> 
> 
> So in current IIO togreg tree this doesn't build.  I could fix it up
> but given we are very late in cycle and I'd like to give this a little
> more time on list for Andy to take another look if he wishes, chances
> are this won't make it in until early next cycle.
> 
Applied to the togreg branch of iio.git and pushed out as testing for
now only as I'll be rebaseing on rc1 once available.

Thanks,

Jonathan

> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/iio/adc/npcm_adc.c | 35 ++++++++++++++++++++++++++++-------
> >  1 file changed, 28 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
> > index f7bc0bb7f112..4c7ebcd57b88 100644
> > --- a/drivers/iio/adc/npcm_adc.c
> > +++ b/drivers/iio/adc/npcm_adc.c
> > @@ -16,6 +16,12 @@
> >  #include <linux/uaccess.h>
> >  #include <linux/reset.h>
> >  
> > +struct npcm_adc_info {
> > +	u32 data_mask;
> > +	u32 internal_vref;
> > +	u32 res_bits;
> > +};
> > +
> >  struct npcm_adc {
> >  	bool int_status;
> >  	u32 adc_sample_hz;
> > @@ -34,6 +40,7 @@ struct npcm_adc {
> >  	 * has finished.
> >  	 */
> >  	struct mutex lock;
> > +	const struct npcm_adc_info *data;
> >  };
> >  
> >  /* ADC registers */
> > @@ -52,13 +59,21 @@ struct npcm_adc {
> >  #define NPCM_ADCCON_CH(x)		((x) << 24)
> >  #define NPCM_ADCCON_DIV_SHIFT		1
> >  #define NPCM_ADCCON_DIV_MASK		GENMASK(8, 1)
> > -#define NPCM_ADC_DATA_MASK(x)		((x) & GENMASK(9, 0))
> >  
> >  #define NPCM_ADC_ENABLE		(NPCM_ADCCON_ADC_EN | NPCM_ADCCON_ADC_INT_EN)
> >  
> >  /* ADC General Definition */
> > -#define NPCM_RESOLUTION_BITS		10
> > -#define NPCM_INT_VREF_MV		2000
> > +static const struct npcm_adc_info npxm7xx_adc_info = {
> > +	.data_mask = GENMASK(9, 0),
> > +	.internal_vref = 2048,
> > +	.res_bits = 10,
> > +};
> > +
> > +static const struct npcm_adc_info npxm8xx_adc_info = {
> > +	.data_mask = GENMASK(11, 0),
> > +	.internal_vref = 1229,
> > +	.res_bits = 12,
> > +};
> >  
> >  #define NPCM_ADC_CHAN(ch) {					\
> >  	.type = IIO_VOLTAGE,					\
> > @@ -129,7 +144,8 @@ static int npcm_adc_read(struct npcm_adc *info, int *val, u8 channel)
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	*val = NPCM_ADC_DATA_MASK(ioread32(info->regs + NPCM_ADCDATA));
> > +	*val = ioread32(info->regs + NPCM_ADCDATA);
> > +	*val &= info->data->data_mask;
> >  
> >  	return 0;
> >  }
> > @@ -157,9 +173,9 @@ static int npcm_adc_read_raw(struct iio_dev *indio_dev,
> >  			vref_uv = regulator_get_voltage(info->vref);
> >  			*val = vref_uv / 1000;
> >  		} else {
> > -			*val = NPCM_INT_VREF_MV;
> > +			*val = info->data->internal_vref;
> >  		}
> > -		*val2 = NPCM_RESOLUTION_BITS;
> > +		*val2 = info->data->res_bits;
> >  		return IIO_VAL_FRACTIONAL_LOG2;
> >  	case IIO_CHAN_INFO_SAMP_FREQ:
> >  		*val = info->adc_sample_hz;
> > @@ -176,7 +192,8 @@ static const struct iio_info npcm_adc_iio_info = {
> >  };
> >  
> >  static const struct of_device_id npcm_adc_match[] = {
> > -	{ .compatible = "nuvoton,npcm750-adc", },
> > +	{ .compatible = "nuvoton,npcm750-adc", .data = &npxm7xx_adc_info},
> > +	{ .compatible = "nuvoton,npcm845-adc", .data = &npxm8xx_adc_info},
> >  	{ /* sentinel */ }
> >  };
> >  MODULE_DEVICE_TABLE(of, npcm_adc_match);
> > @@ -196,6 +213,10 @@ static int npcm_adc_probe(struct platform_device *pdev)
> >  		return -ENOMEM;
> >  	info = iio_priv(indio_dev);
> >  
> > +	info->data = device_get_match_data(dev);
> > +	if (!info->data)
> > +		return -EINVAL;
> > +
> >  	mutex_init(&info->lock);
> >  
> >  	info->dev = &pdev->dev;  
>