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Message-ID: <20250804100219.63325-10-varshini.rajendran@microchip.com>
Date: Mon, 4 Aug 2025 15:32:13 +0530
From: Varshini Rajendran <varshini.rajendran@...rochip.com>
To: <eugen.hristev@...aro.org>, <jic23@...nel.org>, <dlechner@...libre.com>,
<nuno.sa@...log.com>, <andy@...nel.org>, <robh@...nel.org>,
<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>,
<srini@...nel.org>, <linux-iio@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <varshini.rajendran@...rochip.com>
Subject: [PATCH 09/15] iio: adc: at91-sama5d2_adc: adapt the driver for sama7d65
Add support to sama7d65 ADC. The differences are highlighted with the
compatible. The init and parsing of the temperature sensor and
calibration indexes are the main differences.
Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
---
drivers/iio/adc/at91-sama5d2_adc.c | 94 ++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 916682e326c7..909841b84834 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -456,6 +456,8 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
struct at91_adc_state;
static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
struct device *dev);
+static int at91_sama7d65_adc_temp_sensor_init(struct at91_adc_state *st,
+ struct device *dev);
/**
* struct at91_adc_platform - at91-sama5d2 platform information struct
@@ -525,6 +527,20 @@ enum at91_adc_ts_clb_idx {
AT91_ADC_TS_CLB_IDX_MAX = 18,
};
+/**
+ * enum at91_sama7d65_adc_ts_clb_idx - calibration indexes in sama7d65 NVMEM buffer
+ * @AT91_SAMA7D65_ADC_TS_CLB_IDX_P1: index for FT1_TEMP equivalent to P1 * (10 ^ 6)
+ * @AT91_SAMA7D65_ADC_TS_CLB_IDX_P4: index for FT1_VPAT equivalent to P4
+ * @AT91_SAMA7D65_ADC_TS_CLB_IDX_P6: index for FT2_VBG equivalent to P6
+ * @AT91_SAMA7D65_ADC_TS_CLB_IDX_MAX: max index for temperature calibration packet in OTP
+ */
+enum at91_sama7d65_adc_ts_clb_idx {
+ AT91_SAMA7D65_ADC_TS_CLB_IDX_P1 = 2,
+ AT91_SAMA7D65_ADC_TS_CLB_IDX_P4 = 1,
+ AT91_SAMA7D65_ADC_TS_CLB_IDX_P6 = 4,
+ AT91_SAMA7D65_ADC_TS_CLB_IDX_MAX = 10,
+};
+
/* Temperature sensor calibration - Vtemp voltage sensitivity to temperature. */
#define AT91_ADC_TS_VTEMP_DT (2080U)
@@ -764,6 +780,31 @@ static const struct at91_adc_platform sama7g5_platform = {
.temp_init = at91_adc_temp_sensor_init,
};
+static const struct at91_adc_platform sama7d65_platform = {
+ .layout = &sama7g5_layout,
+ .adc_channels = &at91_sama7g5_adc_channels,
+#define AT91_SAMA7D65_SINGLE_CHAN_CNT 16
+#define AT91_SAMA7D65_DIFF_CHAN_CNT 8
+#define AT91_SAMA7D65_TEMP_CHAN_CNT 1
+ .nr_channels = AT91_SAMA7D65_SINGLE_CHAN_CNT +
+ AT91_SAMA7D65_DIFF_CHAN_CNT +
+ AT91_SAMA7D65_TEMP_CHAN_CNT,
+#define AT91_SAMA7D65_MAX_CHAN_IDX (AT91_SAMA7D65_SINGLE_CHAN_CNT + \
+ AT91_SAMA7D65_DIFF_CHAN_CNT + \
+ AT91_SAMA7D65_TEMP_CHAN_CNT)
+ .max_channels = ARRAY_SIZE(at91_sama7g5_adc_channels),
+ .max_index = AT91_SAMA7D65_MAX_CHAN_IDX,
+#define AT91_SAMA7G5_HW_TRIG_CNT 3
+ .hw_trig_cnt = AT91_SAMA7G5_HW_TRIG_CNT,
+ .osr_mask = GENMASK(18, 16),
+ .oversampling_avail = { 1, 4, 16, 64, 256, },
+ .oversampling_avail_no = 5,
+ .chan_realbits = 16,
+ .temp_sensor = true,
+ .temp_chan = AT91_SAMA7G5_ADC_TEMP_CHANNEL,
+ .temp_init = at91_sama7d65_adc_temp_sensor_init,
+};
+
static int at91_adc_chan_xlate(struct iio_dev *indio_dev, int chan)
{
int i;
@@ -2319,6 +2360,56 @@ static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
return ret;
}
+static int at91_sama7d65_adc_temp_sensor_init(struct at91_adc_state *st,
+ struct device *dev)
+{
+ struct at91_adc_temp_sensor_clb *clb = &st->soc_info.temp_sensor_clb;
+ struct nvmem_cell *temp_calib;
+ u32 *buf = NULL;
+ size_t len;
+ int ret = 0;
+
+ if (!st->soc_info.platform->temp_sensor)
+ return 0;
+
+ /* Get the calibration data from NVMEM. */
+ temp_calib = devm_nvmem_cell_get(dev, "temperature_calib");
+ if (IS_ERR(temp_calib)) {
+ ret = PTR_ERR(temp_calib);
+ if (ret != -ENOENT)
+ dev_err(dev, "Failed to get temperature_calib cell!\n");
+ return ret;
+ }
+
+ buf = nvmem_cell_read(temp_calib, &len);
+ if (IS_ERR(buf)) {
+ dev_err(dev, "Failed to read calibration data!\n");
+ return PTR_ERR(buf);
+ }
+
+ if (len < AT91_SAMA7D65_ADC_TS_CLB_IDX_MAX * sizeof(u32) ||
+ buf[0] != AT91_TEMP_CALIB_TAG) {
+ dev_err(dev, "Invalid calibration data!\n");
+ ret = -EINVAL;
+ goto free_buf;
+ }
+
+ /* Store calibration data for later use. */
+ clb->p1 = buf[AT91_SAMA7D65_ADC_TS_CLB_IDX_P1];
+ clb->p4 = buf[AT91_SAMA7D65_ADC_TS_CLB_IDX_P4];
+ clb->p6 = buf[AT91_SAMA7D65_ADC_TS_CLB_IDX_P6];
+
+ /*
+ * We prepare here the conversion to milli from micro to avoid
+ * doing it on hotpath.
+ */
+ clb->p1 = clb->p1 / 1000;
+
+free_buf:
+ kfree(buf);
+ return ret;
+}
+
static int at91_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -2633,6 +2724,9 @@ static const struct of_device_id at91_adc_dt_match[] = {
}, {
.compatible = "microchip,sama7g5-adc",
.data = (const void *)&sama7g5_platform,
+ }, {
+ .compatible = "microchip,sama7d65-adc",
+ .data = (const void *)&sama7d65_platform,
}, {
/* sentinel */
}
--
2.34.1
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