Adding ADC NPCM8XX support to NPCM ADC driver.
ADC NPCM8XX uses a different resolution and voltage reference.
As part of adding NPCM8XX support:
- Add NPCM8XX specific compatible string.
- Add data to handle architecture-specific ADC parameters.
Signed-off-by: Tomer Maimon <tmaimon77@xxxxxxxxx>
---
drivers/iio/adc/npcm_adc.c | 35 ++++++++++++++++++++++++++++-------
1 file changed, 28 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
index f7bc0bb7f112..406038b5c0d6 100644
--- a/drivers/iio/adc/npcm_adc.c
+++ b/drivers/iio/adc/npcm_adc.c
@@ -16,6 +16,12 @@
#include <linux/uaccess.h>
#include <linux/reset.h>
+struct npcm_adc_info {
+ u32 data_mask;
+ u32 internal_vref;
+ u32 res_bits;
+};
+
struct npcm_adc {
bool int_status;
u32 adc_sample_hz;
@@ -34,6 +40,7 @@ struct npcm_adc {
* has finished.
*/
struct mutex lock;
+ struct npcm_adc_info *data;
};
/* ADC registers */
@@ -52,13 +59,21 @@ struct npcm_adc {
#define NPCM_ADCCON_CH(x) ((x) << 24)
#define NPCM_ADCCON_DIV_SHIFT 1
#define NPCM_ADCCON_DIV_MASK GENMASK(8, 1)
-#define NPCM_ADC_DATA_MASK(x) ((x) & GENMASK(9, 0))
#define NPCM_ADC_ENABLE (NPCM_ADCCON_ADC_EN | NPCM_ADCCON_ADC_INT_EN)
/* ADC General Definition */
-#define NPCM_RESOLUTION_BITS 10
-#define NPCM_INT_VREF_MV 2000
+static const struct npcm_adc_info npxm7xx_adc_info = {
+ .data_mask = GENMASK(9, 0),
+ .internal_vref = 2048,
+ .res_bits = 10,
+};
+
+static const struct npcm_adc_info npxm8xx_adc_info = {
+ .data_mask = GENMASK(11, 0),
+ .internal_vref = 1229,
+ .res_bits = 12,
+};
#define NPCM_ADC_CHAN(ch) { \
.type = IIO_VOLTAGE, \
@@ -129,7 +144,8 @@ static int npcm_adc_read(struct npcm_adc *info, int *val, u8 channel)
if (ret < 0)
return ret;
- *val = NPCM_ADC_DATA_MASK(ioread32(info->regs + NPCM_ADCDATA));
+ *val = ioread32(info->regs + NPCM_ADCDATA);
+ *val &= info->data->data_mask;
return 0;
}
@@ -157,9 +173,9 @@ static int npcm_adc_read_raw(struct iio_dev *indio_dev,
vref_uv = regulator_get_voltage(info->vref);
*val = vref_uv / 1000;
} else {
- *val = NPCM_INT_VREF_MV;
+ *val = info->data->internal_vref;
}
- *val2 = NPCM_RESOLUTION_BITS;
+ *val2 = info->data->res_bits;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = info->adc_sample_hz;
@@ -176,7 +192,8 @@ static const struct iio_info npcm_adc_iio_info = {
};
static const struct of_device_id npcm_adc_match[] = {
- { .compatible = "nuvoton,npcm750-adc", },
+ { .compatible = "nuvoton,npcm750-adc", .data = &npxm7xx_adc_info},
+ { .compatible = "nuvoton,npcm845-adc", .data = &npxm8xx_adc_info},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, npcm_adc_match);
@@ -196,6 +213,10 @@ static int npcm_adc_probe(struct platform_device *pdev)
return -ENOMEM;
info = iio_priv(indio_dev);
+ info->data = (struct npcm_adc_info *)device_get_match_data(dev);
+ if (!info->data)
+ return -EINVAL;
+
mutex_init(&info->lock);
info->dev = &pdev->dev;
--
2.33.0
