Re: [PATCH 3/6] iio/adc: ingenic: add JZ4760 support to the sadc driver

[Christophe Branchereau <cbranchereau@gmail.com>]

Hello Paul, thank you for all the feedback, duly noted I will V2,
there is just one I disagree with:

On Wed, Jul 21, 2021 at 8:15 PM Paul Cercueil <paul@crapouillou.net> wrote:
>
> Hi Christophe,
>
> Le mer., juil. 21 2021 at 12:53:14 +0200, citral23
> <cbranchereau@gmail.com> a écrit :
> > Signed-off-by: citral23 <cbranchereau@gmail.com>
> > ---
> >  drivers/iio/adc/ingenic-adc.c | 64
> > +++++++++++++++++++++++++++++++++++
> >  1 file changed, 64 insertions(+)
> >
> > diff --git a/drivers/iio/adc/ingenic-adc.c
> > b/drivers/iio/adc/ingenic-adc.c
> > index 40f2d8c2cf72..285e7aa8e37a 100644
> > --- a/drivers/iio/adc/ingenic-adc.c
> > +++ b/drivers/iio/adc/ingenic-adc.c
> > @@ -71,6 +71,7 @@
> >  #define JZ4725B_ADC_BATTERY_HIGH_VREF_BITS   10
> >  #define JZ4740_ADC_BATTERY_HIGH_VREF         (7500 * 0.986)
> >  #define JZ4740_ADC_BATTERY_HIGH_VREF_BITS    12
> > +#define JZ4760_ADC_BATTERY_VREF                      2500
> >  #define JZ4770_ADC_BATTERY_VREF                      1200
> >  #define JZ4770_ADC_BATTERY_VREF_BITS         12
> >
> > @@ -295,6 +296,10 @@ static const int
> > jz4740_adc_battery_scale_avail[] = {
> >       JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
> >  };
> >
> > +static const int jz4760_adc_battery_scale_avail[] = {
> > +     JZ4760_ADC_BATTERY_VREF, JZ4770_ADC_BATTERY_VREF_BITS,
> > +};
> > +
> >  static const int jz4770_adc_battery_raw_avail[] = {
> >       0, 1, (1 << JZ4770_ADC_BATTERY_VREF_BITS) - 1,
> >  };
> > @@ -339,6 +344,8 @@ static int jz4725b_adc_init_clk_div(struct device
> > *dev, struct ingenic_adc *adc)
> >       return 0;
> >  }
> >
> > +
> > +
>
> Unrelated cosmetic change - remove it.

This is not cosmetic, but to add a VREF of 2.5V for the jz4760, as per specs

>
> >  static int jz4770_adc_init_clk_div(struct device *dev, struct
> > ingenic_adc *adc)
> >  {
> >       struct clk *parent_clk;
> > @@ -400,6 +407,47 @@ static const struct iio_chan_spec
> > jz4740_channels[] = {
> >       },
> >  };
> >
> > +static const struct iio_chan_spec jz4760_channels[] = {
> > +     {
> > +             .extend_name = "aux0",
> > +             .type = IIO_VOLTAGE,
> > +             .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > +                                   BIT(IIO_CHAN_INFO_SCALE),
> > +             .indexed = 1,
> > +             .channel = INGENIC_ADC_AUX0,
> > +             .scan_index = -1,
> > +     },
> > +     {
> > +             .extend_name = "aux",
> > +             .type = IIO_VOLTAGE,
> > +             .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > +                                   BIT(IIO_CHAN_INFO_SCALE),
> > +             .indexed = 1,
> > +             .channel = INGENIC_ADC_AUX,
> > +             .scan_index = -1,
> > +     },
>
> A couple of things. First, ".extend_name" is deprecated now... But
> since the driver used it before, I suppose it doesn't make sense to use
> labels just for this SoC (as we can't remove .extend_name for other
> SoCs because of ABI). So I suppose it works here, but maybe Jonathan
> disagrees.
>
> Also, you should probably use "aux1" as the channel's name instead of
> "aux", independently of the macro name you used in the .channel field.
>
> > +     {
> > +             .extend_name = "battery",
> > +             .type = IIO_VOLTAGE,
> > +             .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > +                                   BIT(IIO_CHAN_INFO_SCALE),
> > +             .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
> > +                                             BIT(IIO_CHAN_INFO_SCALE),
> > +             .indexed = 1,
> > +             .channel = INGENIC_ADC_BATTERY,
> > +             .scan_index = -1,
> > +     },
>
> Swap the battery channel at the end, no? First the three AUX then the
> battery channel?
>
> The rest looks pretty good to me.
>
> Cheers,
> -Paul
>
> > +     {
> > +             .extend_name = "aux2",
> > +             .type = IIO_VOLTAGE,
> > +             .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > +                                   BIT(IIO_CHAN_INFO_SCALE),
> > +             .indexed = 1,
> > +             .channel = INGENIC_ADC_AUX2,
> > +             .scan_index = -1,
> > +     },
> > +};
> > +
> >  static const struct iio_chan_spec jz4770_channels[] = {
> >       {
> >               .type = IIO_VOLTAGE,
> > @@ -526,6 +574,20 @@ static const struct ingenic_adc_soc_data
> > jz4740_adc_soc_data = {
> >       .init_clk_div = NULL, /* no ADCLK register on JZ4740 */
> >  };
> >
> > +static const struct ingenic_adc_soc_data jz4760_adc_soc_data = {
> > +     .battery_high_vref = JZ4760_ADC_BATTERY_VREF,
> > +     .battery_high_vref_bits = JZ4770_ADC_BATTERY_VREF_BITS,
> > +     .battery_raw_avail = jz4770_adc_battery_raw_avail,
> > +     .battery_raw_avail_size = ARRAY_SIZE(jz4770_adc_battery_raw_avail),
> > +     .battery_scale_avail = jz4760_adc_battery_scale_avail,
> > +     .battery_scale_avail_size =
> > ARRAY_SIZE(jz4760_adc_battery_scale_avail),
> > +     .battery_vref_mode = false,
> > +     .has_aux_md = true,
> > +     .channels = jz4760_channels,
> > +     .num_channels = ARRAY_SIZE(jz4760_channels),
> > +     .init_clk_div = jz4770_adc_init_clk_div,
> > +};
> > +
> >  static const struct ingenic_adc_soc_data jz4770_adc_soc_data = {
> >       .battery_high_vref = JZ4770_ADC_BATTERY_VREF,
> >       .battery_high_vref_bits = JZ4770_ADC_BATTERY_VREF_BITS,
> > @@ -621,6 +683,7 @@ static int ingenic_adc_read_raw(struct iio_dev
> > *iio_dev,
> >               return ingenic_adc_read_chan_info_raw(iio_dev, chan, val);
> >       case IIO_CHAN_INFO_SCALE:
> >               switch (chan->channel) {
> > +             case INGENIC_ADC_AUX0:
> >               case INGENIC_ADC_AUX:
> >               case INGENIC_ADC_AUX2:
> >                       *val = JZ_ADC_AUX_VREF;
> > @@ -832,6 +895,7 @@ static int ingenic_adc_probe(struct
> > platform_device *pdev)
> >  static const struct of_device_id ingenic_adc_of_match[] = {
> >       { .compatible = "ingenic,jz4725b-adc", .data =
> > &jz4725b_adc_soc_data, },
> >       { .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data,
> > },
> > +     { .compatible = "ingenic,jz4760-adc", .data = &jz4760_adc_soc_data,
> > },
> >       { .compatible = "ingenic,jz4770-adc", .data = &jz4770_adc_soc_data,
> > },
> >       { },
> >  };
> > --
> > 2.30.2
> >
>
>
KR
CB