Re: [PATCH v4 1/3] iio: adc: vf610: use ADC clock within specification

[Jonathan Cameron]

On 24/03/15 12:47, Stefan Agner wrote:
> Depending on conversion mode used, the ADC clock (ADCK) needs
> to be below a maximum frequency. According to Vybrid's data
> sheet this is 20MHz for the low power conversion mode.
> 
> The ADC clock is depending on input clock, which is the bus
> clock by default. Vybrid SoC are typically clocked at at 400MHz
> or 500MHz, which leads to 66MHz or 83MHz bus clock respectively.
> Hence, a divider of 8 is required to stay below the specified
> maximum clock of 20MHz.
> 
> Due to the different bus clock speeds, the resulting sampling
> frequency is not static. Hence use the ADC clock and calculate
> the actual available sampling frequency dynamically.
> 
> This fixes bogous values observed on some 500MHz clocked Vybrid
> SoC. The resulting value usually showed Bit 9 being stuck at 1,
> or 0, which lead to a value of +/-512.
> 
> Acked-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
> Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
I'd perhaps have stuck the word 'fix' in the description ;)

Anyhow, applied to the fixes-togreg branch of iio.git and marked for stable.

I'll leave the other two for nwo to allow for device tree review and this one to
propagate through to my upstream...

Jonathan
> ---
>  drivers/iio/adc/vf610_adc.c | 91 ++++++++++++++++++++++++++++++---------------
>  1 file changed, 61 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
> index 8ec353c..e63b8e7 100644
> --- a/drivers/iio/adc/vf610_adc.c
> +++ b/drivers/iio/adc/vf610_adc.c
> @@ -141,9 +141,13 @@ struct vf610_adc {
>  	struct regulator *vref;
>  	struct vf610_adc_feature adc_feature;
>  
> +	u32 sample_freq_avail[5];
> +
>  	struct completion completion;
>  };
>  
> +static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
> +
>  #define VF610_ADC_CHAN(_idx, _chan_type) {			\
>  	.type = (_chan_type),					\
>  	.indexed = 1,						\
> @@ -180,35 +184,47 @@ static const struct iio_chan_spec vf610_adc_iio_channels[] = {
>  	/* sentinel */
>  };
>  
> -/*
> - * ADC sample frequency, unit is ADCK cycles.
> - * ADC clk source is ipg clock, which is the same as bus clock.
> - *
> - * ADC conversion time = SFCAdder + AverageNum x (BCT + LSTAdder)
> - * SFCAdder: fixed to 6 ADCK cycles
> - * AverageNum: 1, 4, 8, 16, 32 samples for hardware average.
> - * BCT (Base Conversion Time): fixed to 25 ADCK cycles for 12 bit mode
> - * LSTAdder(Long Sample Time): fixed to 3 ADCK cycles
> - *
> - * By default, enable 12 bit resolution mode, clock source
> - * set to ipg clock, So get below frequency group:
> - */
> -static const u32 vf610_sample_freq_avail[5] =
> -{1941176, 559332, 286957, 145374, 73171};
> +static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
> +{
> +	unsigned long adck_rate, ipg_rate = clk_get_rate(info->clk);
> +	int i;
> +
> +	/*
> +	 * Calculate ADC sample frequencies
> +	 * Sample time unit is ADCK cycles. ADCK clk source is ipg clock,
> +	 * which is the same as bus clock.
> +	 *
> +	 * ADC conversion time = SFCAdder + AverageNum x (BCT + LSTAdder)
> +	 * SFCAdder: fixed to 6 ADCK cycles
> +	 * AverageNum: 1, 4, 8, 16, 32 samples for hardware average.
> +	 * BCT (Base Conversion Time): fixed to 25 ADCK cycles for 12 bit mode
> +	 * LSTAdder(Long Sample Time): fixed to 3 ADCK cycles
> +	 */
> +	adck_rate = ipg_rate / info->adc_feature.clk_div;
> +	for (i = 0; i < ARRAY_SIZE(vf610_hw_avgs); i++)
> +		info->sample_freq_avail[i] =
> +			adck_rate / (6 + vf610_hw_avgs[i] * (25 + 3));
> +}
>  
>  static inline void vf610_adc_cfg_init(struct vf610_adc *info)
>  {
> +	struct vf610_adc_feature *adc_feature = &info->adc_feature;
> +
>  	/* set default Configuration for ADC controller */
> -	info->adc_feature.clk_sel = VF610_ADCIOC_BUSCLK_SET;
> -	info->adc_feature.vol_ref = VF610_ADCIOC_VR_VREF_SET;
> +	adc_feature->clk_sel = VF610_ADCIOC_BUSCLK_SET;
> +	adc_feature->vol_ref = VF610_ADCIOC_VR_VREF_SET;
> +
> +	adc_feature->calibration = true;
> +	adc_feature->ovwren = true;
> +
> +	adc_feature->res_mode = 12;
> +	adc_feature->sample_rate = 1;
> +	adc_feature->lpm = true;
>  
> -	info->adc_feature.calibration = true;
> -	info->adc_feature.ovwren = true;
> +	/* Use a save ADCK which is below 20MHz on all devices */
> +	adc_feature->clk_div = 8;
>  
> -	info->adc_feature.clk_div = 1;
> -	info->adc_feature.res_mode = 12;
> -	info->adc_feature.sample_rate = 1;
> -	info->adc_feature.lpm = true;
> +	vf610_adc_calculate_rates(info);
>  }
>  
>  static void vf610_adc_cfg_post_set(struct vf610_adc *info)
> @@ -290,12 +306,10 @@ static void vf610_adc_cfg_set(struct vf610_adc *info)
>  
>  	cfg_data = readl(info->regs + VF610_REG_ADC_CFG);
>  
> -	/* low power configuration */
>  	cfg_data &= ~VF610_ADC_ADLPC_EN;
>  	if (adc_feature->lpm)
>  		cfg_data |= VF610_ADC_ADLPC_EN;
>  
> -	/* disable high speed */
>  	cfg_data &= ~VF610_ADC_ADHSC_EN;
>  
>  	writel(cfg_data, info->regs + VF610_REG_ADC_CFG);
> @@ -435,10 +449,27 @@ static irqreturn_t vf610_adc_isr(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("1941176, 559332, 286957, 145374, 73171");
> +static ssize_t vf610_show_samp_freq_avail(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct vf610_adc *info = iio_priv(dev_to_iio_dev(dev));
> +	size_t len = 0;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(info->sample_freq_avail); i++)
> +		len += scnprintf(buf + len, PAGE_SIZE - len,
> +			"%u ", info->sample_freq_avail[i]);
> +
> +	/* replace trailing space by newline */
> +	buf[len - 1] = '\n';
> +
> +	return len;
> +}
> +
> +static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(vf610_show_samp_freq_avail);
>  
>  static struct attribute *vf610_attributes[] = {
> -	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
> +	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
>  	NULL
>  };
>  
> @@ -502,7 +533,7 @@ static int vf610_read_raw(struct iio_dev *indio_dev,
>  		return IIO_VAL_FRACTIONAL_LOG2;
>  
>  	case IIO_CHAN_INFO_SAMP_FREQ:
> -		*val = vf610_sample_freq_avail[info->adc_feature.sample_rate];
> +		*val = info->sample_freq_avail[info->adc_feature.sample_rate];
>  		*val2 = 0;
>  		return IIO_VAL_INT;
>  
> @@ -525,9 +556,9 @@ static int vf610_write_raw(struct iio_dev *indio_dev,
>  	switch (mask) {
>  		case IIO_CHAN_INFO_SAMP_FREQ:
>  			for (i = 0;
> -				i < ARRAY_SIZE(vf610_sample_freq_avail);
> +				i < ARRAY_SIZE(info->sample_freq_avail);
>  				i++)
> -				if (val == vf610_sample_freq_avail[i]) {
> +				if (val == info->sample_freq_avail[i]) {
>  					info->adc_feature.sample_rate = i;
>  					vf610_adc_sample_set(info);
>  					return 0;
> 

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