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

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Date:   Sat, 26 Sep 2020 15:10:08 +0200
From:   kholk11@...il.com
To:     agross@...nel.org
Cc:     bjorn.andersson@...aro.org, jic23@...nel.org, robh+dt@...nel.org,
        kholk11@...il.com, marijns95@...il.com, konradybcio@...il.com,
        martin.botka1@...il.com, linux-arm-msm@...r.kernel.org,
        phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] iio: adc: qcom-spmi-vadc: Use right ratiometric range for 8998,660,845

From: AngeloGioacchino Del Regno <kholk11@...il.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 <kholk11@...il.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