[PATCH 1/2] iio: adc: qcom-spmi-vadc: Use right ratiometric range for 8998,660,845

[kholk11]

From: AngeloGioacchino Del Regno <khol...@gmail.com>

The ratiometric range for MSM8998, SDM630/636/660 and SDM845 is 1875mV
instead of the standard 1800mV: address this by adding a new compatible
"qcom,spmi-vadc-8998" and assigning the different range to the machines
declaring this one.

Signed-off-by: AngeloGioacchino Del Regno <khol...@gmail.com>
---
 drivers/iio/adc/qcom-spmi-vadc.c   | 10 +++++++++-
 drivers/iio/adc/qcom-vadc-common.h |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
index b0388f8a69f4..59a94ea7bf78 100644
--- a/drivers/iio/adc/qcom-spmi-vadc.c
+++ b/drivers/iio/adc/qcom-spmi-vadc.c
@@ -101,6 +101,7 @@ struct vadc_channel_prop {
  * @dev: pointer to struct device.
  * @base: base address for the ADC peripheral.
  * @nchannels: number of VADC channels.
+ * @ratio_range: ratiometric range for ref points.
  * @chan_props: array of VADC channel properties.
  * @iio_chans: array of IIO channels specification.
  * @are_ref_measured: are reference points measured.
@@ -114,6 +115,7 @@ struct vadc_priv {
        struct device            *dev;
        u16                      base;
        unsigned int             nchannels;
+       unsigned int             ratio_range;
        struct vadc_channel_prop *chan_props;
        struct iio_chan_spec     *iio_chans;
        bool                     are_ref_measured;
@@ -355,7 +357,7 @@ static int vadc_measure_ref_points(struct vadc_priv *vadc)
        u16 read_1, read_2;
        int ret;
 
-       vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
+       vadc->graph[VADC_CALIB_RATIOMETRIC].dx = vadc->ratio_range;
        vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
 
        prop = vadc_get_channel(vadc, VADC_REF_1250MV);
@@ -885,6 +887,11 @@ static int vadc_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       if (of_device_is_compatible(node, "qcom,spmi-vadc-8998"))
+               vadc->ratio_range = VADC_RATIOMETRIC_RANGE_8998;
+       else
+               vadc->ratio_range = VADC_RATIOMETRIC_RANGE;
+
        irq_eoc = platform_get_irq(pdev, 0);
        if (irq_eoc < 0) {
                if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
@@ -918,6 +925,7 @@ static int vadc_probe(struct platform_device *pdev)
 
 static const struct of_device_id vadc_match_table[] = {
        { .compatible = "qcom,spmi-vadc" },
+       { .compatible = "qcom-spmi-vadc-8998" },
        { }
 };
 MODULE_DEVICE_TABLE(of, vadc_match_table);
diff --git a/drivers/iio/adc/qcom-vadc-common.h 
b/drivers/iio/adc/qcom-vadc-common.h
index 17b2fc4d8bf2..b10d5fd59034 100644
--- a/drivers/iio/adc/qcom-vadc-common.h
+++ b/drivers/iio/adc/qcom-vadc-common.h
@@ -16,6 +16,7 @@
 
 #define VADC_ABSOLUTE_RANGE_UV                 625000
 #define VADC_RATIOMETRIC_RANGE                 1800
+#define VADC_RATIOMETRIC_RANGE_8998            1875
 
 #define VADC_DEF_PRESCALING                    0 /* 1:1 */
 #define VADC_DEF_DECIMATION                    0 /* 512 */
-- 
2.28.0