linux-kernel - Re: [PATCH 1/2] iio: adc: qcom-spmi-vadc: Use right ratiometric range for 8998,660,845

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Date:   Sat, 26 Sep 2020 17:28:31 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     kholk11@...il.com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        marijns95@...il.com, konradybcio@...il.com,
        martin.botka1@...il.com, linux-arm-msm@...r.kernel.org,
        phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] iio: adc: qcom-spmi-vadc: Use right ratiometric
 range for 8998,660,845

On Sat, 26 Sep 2020 15:10:08 +0200
kholk11@...il.com wrote:

> From: AngeloGioacchino Del Regno <kholk11@...il.com>
> 
> The ratiometric range for MSM8998, SDM630/636/660 and SDM845 is 1875mV
> instead of the standard 1800mV: address this by adding a new compatible
> "qcom,spmi-vadc-8998" and assigning the different range to the machines
> declaring this one.
> 
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@...il.com>

Please resend series making sure to cc
linux-iio@...r.kernel.org 

From a quick glance, patch looks fine.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/qcom-spmi-vadc.c   | 10 +++++++++-
>  drivers/iio/adc/qcom-vadc-common.h |  1 +
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
> index b0388f8a69f4..59a94ea7bf78 100644
> --- a/drivers/iio/adc/qcom-spmi-vadc.c
> +++ b/drivers/iio/adc/qcom-spmi-vadc.c
> @@ -101,6 +101,7 @@ struct vadc_channel_prop {
>   * @dev: pointer to struct device.
>   * @base: base address for the ADC peripheral.
>   * @nchannels: number of VADC channels.
> + * @ratio_range: ratiometric range for ref points.
>   * @chan_props: array of VADC channel properties.
>   * @iio_chans: array of IIO channels specification.
>   * @are_ref_measured: are reference points measured.
> @@ -114,6 +115,7 @@ struct vadc_priv {
>  	struct device		 *dev;
>  	u16			 base;
>  	unsigned int		 nchannels;
> +	unsigned int		 ratio_range;
>  	struct vadc_channel_prop *chan_props;
>  	struct iio_chan_spec	 *iio_chans;
>  	bool			 are_ref_measured;
> @@ -355,7 +357,7 @@ static int vadc_measure_ref_points(struct vadc_priv *vadc)
>  	u16 read_1, read_2;
>  	int ret;
>  
> -	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
> +	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = vadc->ratio_range;
>  	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
>  
>  	prop = vadc_get_channel(vadc, VADC_REF_1250MV);
> @@ -885,6 +887,11 @@ static int vadc_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +	if (of_device_is_compatible(node, "qcom,spmi-vadc-8998"))
> +		vadc->ratio_range = VADC_RATIOMETRIC_RANGE_8998;
> +	else
> +		vadc->ratio_range = VADC_RATIOMETRIC_RANGE;
> +
>  	irq_eoc = platform_get_irq(pdev, 0);
>  	if (irq_eoc < 0) {
>  		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
> @@ -918,6 +925,7 @@ static int vadc_probe(struct platform_device *pdev)
>  
>  static const struct of_device_id vadc_match_table[] = {
>  	{ .compatible = "qcom,spmi-vadc" },
> +	{ .compatible = "qcom-spmi-vadc-8998" },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, vadc_match_table);
> diff --git a/drivers/iio/adc/qcom-vadc-common.h b/drivers/iio/adc/qcom-vadc-common.h
> index 17b2fc4d8bf2..b10d5fd59034 100644
> --- a/drivers/iio/adc/qcom-vadc-common.h
> +++ b/drivers/iio/adc/qcom-vadc-common.h
> @@ -16,6 +16,7 @@
>  
>  #define VADC_ABSOLUTE_RANGE_UV			625000
>  #define VADC_RATIOMETRIC_RANGE			1800
> +#define VADC_RATIOMETRIC_RANGE_8998		1875
>  
>  #define VADC_DEF_PRESCALING			0 /* 1:1 */
>  #define VADC_DEF_DECIMATION			0 /* 512 */