On Fri, 13 Nov 2020 22:26:43 +0100 Alexandre Belloni <[email protected]> wrote:
> Move the possible resolution values back to the driver. This removes the > atmel,adc-res and atmel,adc-res-names properties, leaving only > atmel,adc-use-res. As atmel,adc-res-names had to contain "lowres" and > "highres", those where already the only allowed values for > atmel,adc-use-res. > > Also introduce a new compatible string for the sama5d3 as this is the only > one with a different resolution. Also it doesn't event have the LOWRES even? > bit. > > Signed-off-by: Alexandre Belloni <[email protected]> Looks good otherwise. > --- > .../devicetree/bindings/iio/adc/at91_adc.txt | 13 +-- > drivers/iio/adc/at91_adc.c | 97 ++++++++----------- > 2 files changed, 44 insertions(+), 66 deletions(-) > > diff --git a/Documentation/devicetree/bindings/iio/adc/at91_adc.txt > b/Documentation/devicetree/bindings/iio/adc/at91_adc.txt > index f65b04fb7962..da393ac5c05f 100644 > --- a/Documentation/devicetree/bindings/iio/adc/at91_adc.txt > +++ b/Documentation/devicetree/bindings/iio/adc/at91_adc.txt > @@ -2,7 +2,7 @@ > > Required properties: > - compatible: Should be "atmel,<chip>-adc" > - <chip> can be "at91sam9260", "at91sam9g45" or "at91sam9x5" > + <chip> can be "at91sam9260", "at91sam9g45", "at91sam9x5" or "sama5d3" > - reg: Should contain ADC registers location and length > - interrupts: Should contain the IRQ line for the ADC > - clock-names: tuple listing input clock names. > @@ -13,17 +13,12 @@ Required properties: > - atmel,adc-startup-time: Startup Time of the ADC in microseconds as > defined in the datasheet > - atmel,adc-vref: Reference voltage in millivolts for the conversions > - - atmel,adc-res: List of resolutions in bits supported by the ADC. List > size > - must be two at least. > - - atmel,adc-res-names: Contains one identifier string for each resolution > - in atmel,adc-res property. "lowres" and "highres" > - identifiers are required. > > Optional properties: > - atmel,adc-use-external-triggers: Boolean to enable the external triggers > - - atmel,adc-use-res: String corresponding to an identifier from > - atmel,adc-res-names property. If not specified, the > highest > - resolution will be used. > + - atmel,adc-use-res: String selecting the resolution, can be "lowres" or > + "highres". If not specified, the highest resolution will > + be used. > - atmel,adc-sleep-mode: Boolean to enable sleep mode when no conversion > - atmel,adc-sample-hold-time: Sample and Hold Time in microseconds > - atmel,adc-ts-wires: Number of touchscreen wires. Should be 4 or 5. If > this > diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c > index 62bd35af8b13..0d67c812ef3d 100644 > --- a/drivers/iio/adc/at91_adc.c > +++ b/drivers/iio/adc/at91_adc.c > @@ -204,6 +204,9 @@ struct at91_adc_caps { > u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz); > > u8 num_channels; > + > + u8 low_res_bits; > + u8 high_res_bits; > struct at91_adc_reg_desc registers; > }; > > @@ -229,7 +232,6 @@ struct at91_adc_state { > bool use_external; > u32 vref_mv; > u32 res; /* resolution used for > convertions */ > - bool low_res; /* the resolution corresponds > to the lowest one */ > wait_queue_head_t wq_data_avail; > struct at91_adc_caps *caps; > > @@ -754,58 +756,6 @@ static int at91_adc_read_raw(struct iio_dev *idev, > return -EINVAL; > } > > -static int at91_adc_of_get_resolution(struct iio_dev *idev, > - struct platform_device *pdev) > -{ > - struct at91_adc_state *st = iio_priv(idev); > - struct device_node *np = pdev->dev.of_node; > - int count, i, ret = 0; > - char *res_name, *s; > - u32 *resolutions; > - > - count = of_property_count_strings(np, "atmel,adc-res-names"); > - if (count < 2) { > - dev_err(&idev->dev, "You must specified at least two resolution > names for " > - "adc-res-names property in the DT\n"); > - return count; > - } > - > - resolutions = kmalloc_array(count, sizeof(*resolutions), GFP_KERNEL); > - if (!resolutions) > - return -ENOMEM; > - > - if (of_property_read_u32_array(np, "atmel,adc-res", resolutions, > count)) { > - dev_err(&idev->dev, "Missing adc-res property in the DT.\n"); > - ret = -ENODEV; > - goto ret; > - } > - > - if (of_property_read_string(np, "atmel,adc-use-res", (const char > **)&res_name)) > - res_name = "highres"; > - > - for (i = 0; i < count; i++) { > - if (of_property_read_string_index(np, "atmel,adc-res-names", i, > (const char **)&s)) > - continue; > - > - if (strcmp(res_name, s)) > - continue; > - > - st->res = resolutions[i]; > - if (!strcmp(res_name, "lowres")) > - st->low_res = true; > - else > - st->low_res = false; > - > - dev_info(&idev->dev, "Resolution used: %u bits\n", st->res); > - goto ret; > - } > - > - dev_err(&idev->dev, "There is no resolution for %s\n", res_name); > - > -ret: > - kfree(resolutions); > - return ret; > -} > > static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz) > { > @@ -891,6 +841,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev, > struct device_node *trig_node; > int i = 0, ret; > u32 prop; > + char *s; > > st->caps = (struct at91_adc_caps *) > of_match_device(at91_adc_dt_ids, &pdev->dev)->data; > @@ -924,9 +875,13 @@ static int at91_adc_probe_dt(struct iio_dev *idev, > } > st->vref_mv = prop; > > - ret = at91_adc_of_get_resolution(idev, pdev); > - if (ret) > - goto error_ret; > + st->res = st->caps->high_res_bits; > + if (st->caps->low_res_bits && > + !of_property_read_string(node, "atmel,adc-use-res", (const char > **)&s) > + && !strcmp(s, "lowres")) > + st->res = st->caps->low_res_bits; > + > + dev_info(&idev->dev, "Resolution used: %u bits\n", st->res); > > st->registers = &st->caps->registers; > st->num_channels = st->caps->num_channels; > @@ -1248,7 +1203,7 @@ static int at91_adc_probe(struct platform_device *pdev) > > reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask; > reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask; > - if (st->low_res) > + if (st->res == st->caps->low_res_bits) > reg |= AT91_ADC_LOWRES; > if (st->sleep_mode) > reg |= AT91_ADC_SLEEP; > @@ -1363,6 +1318,8 @@ static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, > at91_adc_suspend, at91_adc_resume); > static struct at91_adc_caps at91sam9260_caps = { > .calc_startup_ticks = calc_startup_ticks_9260, > .num_channels = 4, > + .low_res_bits = 8, > + .high_res_bits = 10, > .registers = { > .channel_base = AT91_ADC_CHR(0), > .drdy_mask = AT91_ADC_DRDY, > @@ -1377,6 +1334,8 @@ static struct at91_adc_caps at91sam9rl_caps = { > .has_ts = true, > .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ > .num_channels = 6, > + .low_res_bits = 8, > + .high_res_bits = 10, > .registers = { > .channel_base = AT91_ADC_CHR(0), > .drdy_mask = AT91_ADC_DRDY, > @@ -1391,6 +1350,8 @@ static struct at91_adc_caps at91sam9g45_caps = { > .has_ts = true, > .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ > .num_channels = 8, > + .low_res_bits = 8, > + .high_res_bits = 10, > .registers = { > .channel_base = AT91_ADC_CHR(0), > .drdy_mask = AT91_ADC_DRDY, > @@ -1408,6 +1369,8 @@ static struct at91_adc_caps at91sam9x5_caps = { > .ts_pen_detect_sensitivity = 2, > .calc_startup_ticks = calc_startup_ticks_9x5, > .num_channels = 12, > + .low_res_bits = 8, > + .high_res_bits = 10, > .registers = { > .channel_base = AT91_ADC_CDR0_9X5, > .drdy_mask = AT91_ADC_SR_DRDY_9X5, > @@ -1419,11 +1382,31 @@ static struct at91_adc_caps at91sam9x5_caps = { > }, > }; > > +static struct at91_adc_caps sama5d3_caps = { > + .has_ts = true, > + .has_tsmr = true, > + .ts_filter_average = 3, > + .ts_pen_detect_sensitivity = 2, > + .calc_startup_ticks = calc_startup_ticks_9x5, > + .num_channels = 12, > + .low_res_bits = 0, > + .high_res_bits = 12, > + .registers = { > + .channel_base = AT91_ADC_CDR0_9X5, > + .drdy_mask = AT91_ADC_SR_DRDY_9X5, > + .status_register = AT91_ADC_SR_9X5, > + .trigger_register = AT91_ADC_TRGR_9X5, > + .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, > + .mr_startup_mask = AT91_ADC_STARTUP_9X5, > + }, > +}; > + > static const struct of_device_id at91_adc_dt_ids[] = { > { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps }, > { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps }, > { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps }, > { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps }, > + { .compatible = "atmel,sama5d3-adc", .data = &sama5d3_caps }, > {}, > }; > MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);
