From 47be16b6683b86653545bf98f6f57019bb99969c Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Fri, 29 Mar 2013 14:54:00 +0000 Subject: [PATCH] iio: at91_adc: add low and high res support at91 adc offers the choice between two resolutions: low and high. The low and high resolution values depends on adc IP version, as many IP properties have been exposed through device tree, these settings have also been added to the dt bindings. Signed-off-by: Ludovic Desroches Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Signed-off-by: Jonathan Cameron --- .../devicetree/bindings/arm/atmel-adc.txt | 11 +++ drivers/iio/adc/at91_adc.c | 74 ++++++++++++++++++- 2 files changed, 81 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/arm/atmel-adc.txt b/Documentation/devicetree/bindings/arm/atmel-adc.txt index c63097d6afeb..fd2d69ee2876 100644 --- a/Documentation/devicetree/bindings/arm/atmel-adc.txt +++ b/Documentation/devicetree/bindings/arm/atmel-adc.txt @@ -14,9 +14,17 @@ Required properties: - atmel,adc-status-register: Offset of the Interrupt Status Register - atmel,adc-trigger-register: Offset of the Trigger Register - atmel,adc-vref: Reference voltage in millivolts for the conversions + - atmel,adc-res: List of resolution 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: Boolean to enable of 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. Optional trigger Nodes: - Required properties: @@ -40,6 +48,9 @@ adc0: adc@fffb0000 { atmel,adc-trigger-register = <0x08>; atmel,adc-use-external; atmel,adc-vref = <3300>; + atmel,adc-res = <8 10>; + atmel,adc-res-names = "lowres", "highres"; + atmel,adc-use-res = "lowres"; trigger@0 { trigger-name = "external-rising"; diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 6fc43c15f028..3fb3fe48a98c 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -57,6 +57,8 @@ struct at91_adc_state { u32 trigger_number; 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; }; @@ -138,7 +140,7 @@ static int at91_adc_channel_init(struct iio_dev *idev) chan->channel = bit; chan->scan_index = idx; chan->scan_type.sign = 'u'; - chan->scan_type.realbits = 10; + chan->scan_type.realbits = st->res; chan->scan_type.storagebits = 16; chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); @@ -372,6 +374,59 @@ static int at91_adc_read_raw(struct iio_dev *idev, return -EINVAL; } +static int at91_adc_of_get_resolution(struct at91_adc_state *st, + struct platform_device *pdev) +{ + struct iio_dev *idev = iio_priv_to_dev(st); + 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(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 int at91_adc_probe_dt(struct at91_adc_state *st, struct platform_device *pdev) { @@ -415,6 +470,10 @@ static int at91_adc_probe_dt(struct at91_adc_state *st, } st->vref_mv = prop; + ret = at91_adc_of_get_resolution(st, pdev); + if (ret) + goto error_ret; + st->registers = devm_kzalloc(&idev->dev, sizeof(struct at91_adc_reg_desc), GFP_KERNEL); @@ -628,9 +687,16 @@ static int at91_adc_probe(struct platform_device *pdev) */ ticks = round_up((st->startup_time * adc_clk / 1000000) - 1, 8) / 8; - at91_adc_writel(st, AT91_ADC_MR, - (AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) | - (AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP)); + + if (st->low_res) + at91_adc_writel(st, AT91_ADC_MR, + AT91_ADC_LOWRES | + (AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) | + (AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP)); + else + at91_adc_writel(st, AT91_ADC_MR, + (AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) | + (AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP)); /* Setup the ADC channels available on the board */ ret = at91_adc_channel_init(idev); -- 2.30.2