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SubjectRe: [PATCH v2 2/3] iio: adc: stm32: remove const channel names definition
On Thu, 26 Oct 2017 18:45:22 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Wed, 25 Oct 2017 11:27:44 +0200
> Fabrice Gasnier <fabrice.gasnier@st.com> wrote:
>
> > Remove const array that defines channels. Build channels definition
> > at probe time, when initializing channels (only for requested ones).
> > This will ease adding differential channels support.
> >
> > Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
>
> Looks good to me. Only held on Rob finding some time for a final glance
> at the bindings..
Applied.
>
> Thanks,
>
> Jonathan
>
> > ---
> > Changes in v2:
> > - Improve val variable names in stm32_adc_chan_init_one()
> > definition as suggested by Jonathan.
> > ---
> > drivers/iio/adc/stm32-adc.c | 66 ++++++++++-----------------------------------
> > 1 file changed, 14 insertions(+), 52 deletions(-)
> >
> > diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
> > index 4df32cf..417a894 100644
> > --- a/drivers/iio/adc/stm32-adc.c
> > +++ b/drivers/iio/adc/stm32-adc.c
> > @@ -153,6 +153,8 @@ enum stm32h7_adc_dmngt {
> > /* BOOST bit must be set on STM32H7 when ADC clock is above 20MHz */
> > #define STM32H7_BOOST_CLKRATE 20000000UL
> >
> > +#define STM32_ADC_CH_MAX 20 /* max number of channels */
> > +#define STM32_ADC_CH_SZ 5 /* max channel name size */
> > #define STM32_ADC_MAX_SQ 16 /* SQ1..SQ16 */
> > #define STM32_ADC_MAX_SMP 7 /* SMPx range is [0..7] */
> > #define STM32_ADC_TIMEOUT_US 100000
> > @@ -300,6 +302,7 @@ struct stm32_adc_cfg {
> > * @pcsel bitmask to preselect channels on some devices
> > * @smpr_val: sampling time settings (e.g. smpr1 / smpr2)
> > * @cal: optional calibration data on some devices
> > + * @chan_name: channel name array
> > */
> > struct stm32_adc {
> > struct stm32_adc_common *common;
> > @@ -321,69 +324,28 @@ struct stm32_adc {
> > u32 pcsel;
> > u32 smpr_val[2];
> > struct stm32_adc_calib cal;
> > -};
> > -
> > -/**
> > - * struct stm32_adc_chan_spec - specification of stm32 adc channel
> > - * @type: IIO channel type
> > - * @channel: channel number (single ended)
> > - * @name: channel name (single ended)
> > - */
> > -struct stm32_adc_chan_spec {
> > - enum iio_chan_type type;
> > - int channel;
> > - const char *name;
> > + char chan_name[STM32_ADC_CH_MAX][STM32_ADC_CH_SZ];
> > };
> >
> > /**
> > * struct stm32_adc_info - stm32 ADC, per instance config data
> > - * @channels: Reference to stm32 channels spec
> > * @max_channels: Number of channels
> > * @resolutions: available resolutions
> > * @num_res: number of available resolutions
> > */
> > struct stm32_adc_info {
> > - const struct stm32_adc_chan_spec *channels;
> > int max_channels;
> > const unsigned int *resolutions;
> > const unsigned int num_res;
> > };
> >
> > -/*
> > - * Input definitions common for all instances:
> > - * stm32f4 can have up to 16 channels
> > - * stm32h7 can have up to 20 channels
> > - */
> > -static const struct stm32_adc_chan_spec stm32_adc_channels[] = {
> > - { IIO_VOLTAGE, 0, "in0" },
> > - { IIO_VOLTAGE, 1, "in1" },
> > - { IIO_VOLTAGE, 2, "in2" },
> > - { IIO_VOLTAGE, 3, "in3" },
> > - { IIO_VOLTAGE, 4, "in4" },
> > - { IIO_VOLTAGE, 5, "in5" },
> > - { IIO_VOLTAGE, 6, "in6" },
> > - { IIO_VOLTAGE, 7, "in7" },
> > - { IIO_VOLTAGE, 8, "in8" },
> > - { IIO_VOLTAGE, 9, "in9" },
> > - { IIO_VOLTAGE, 10, "in10" },
> > - { IIO_VOLTAGE, 11, "in11" },
> > - { IIO_VOLTAGE, 12, "in12" },
> > - { IIO_VOLTAGE, 13, "in13" },
> > - { IIO_VOLTAGE, 14, "in14" },
> > - { IIO_VOLTAGE, 15, "in15" },
> > - { IIO_VOLTAGE, 16, "in16" },
> > - { IIO_VOLTAGE, 17, "in17" },
> > - { IIO_VOLTAGE, 18, "in18" },
> > - { IIO_VOLTAGE, 19, "in19" },
> > -};
> > -
> > static const unsigned int stm32f4_adc_resolutions[] = {
> > /* sorted values so the index matches RES[1:0] in STM32F4_ADC_CR1 */
> > 12, 10, 8, 6,
> > };
> >
> > +/* stm32f4 can have up to 16 channels */
> > static const struct stm32_adc_info stm32f4_adc_info = {
> > - .channels = stm32_adc_channels,
> > .max_channels = 16,
> > .resolutions = stm32f4_adc_resolutions,
> > .num_res = ARRAY_SIZE(stm32f4_adc_resolutions),
> > @@ -394,9 +356,9 @@ struct stm32_adc_info {
> > 16, 14, 12, 10, 8,
> > };
> >
> > +/* stm32h7 can have up to 20 channels */
> > static const struct stm32_adc_info stm32h7_adc_info = {
> > - .channels = stm32_adc_channels,
> > - .max_channels = 20,
> > + .max_channels = STM32_ADC_CH_MAX,
> > .resolutions = stm32h7_adc_resolutions,
> > .num_res = ARRAY_SIZE(stm32h7_adc_resolutions),
> > };
> > @@ -1628,15 +1590,16 @@ static void stm32_adc_smpr_init(struct stm32_adc *adc, int channel, u32 smp_ns)
> > }
> >
> > static void stm32_adc_chan_init_one(struct iio_dev *indio_dev,
> > - struct iio_chan_spec *chan,
> > - const struct stm32_adc_chan_spec *channel,
> > + struct iio_chan_spec *chan, u32 vinp,
> > int scan_index, u32 smp)
> > {
> > struct stm32_adc *adc = iio_priv(indio_dev);
> > + char *name = adc->chan_name[vinp];
> >
> > - chan->type = channel->type;
> > - chan->channel = channel->channel;
> > - chan->datasheet_name = channel->name;
> > + chan->type = IIO_VOLTAGE;
> > + chan->channel = vinp;
> > + snprintf(name, STM32_ADC_CH_SZ, "in%d", vinp);
> > + chan->datasheet_name = name;
> > chan->scan_index = scan_index;
> > chan->indexed = 1;
> > chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> > @@ -1699,8 +1662,7 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
> > scan_index, &smp);
> >
> > stm32_adc_chan_init_one(indio_dev, &channels[scan_index],
> > - &adc_info->channels[val],
> > - scan_index, smp);
> > + val, scan_index, smp);
> > scan_index++;
> > }
> >
>
> --
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