linux-kernel - Re: [PATCH v3 2/2] iio: adc: npcm: Add NPCM8XX support

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Message-ID: <20220713172132.0bc5002d@jic23-huawei>
Date:   Wed, 13 Jul 2022 17:21:32 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     <avifishman70@...il.com>, <tali.perry1@...il.com>,
        <joel@....id.au>, <venture@...gle.com>, <yuenn@...gle.com>,
        <benjaminfair@...gle.com>, <lars@...afoo.de>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <j.neuschaefer@....net>,
        <zhengbin13@...wei.com>, <openbmc@...ts.ozlabs.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] iio: adc: npcm: Add NPCM8XX support

On Wed, 13 Jul 2022 16:26:40 +0300
Tomer Maimon <tmaimon77@...il.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@...il.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.

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;