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Message-Id: <20250614091504.575685-5-sbellary@baylibre.com>
Date: Sat, 14 Jun 2025 02:15:03 -0700
From: Sukrut Bellary <sbellary@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>,
David Lechner <dlechner@...libre.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Matti Vaittinen <mazziesaccount@...il.com>,
Nuno Sá <nuno.sa@...log.com>,
Andy Shevchenko <andy@...nel.org>,
Angelo Compagnucci <angelo.compagnucci@...il.com>
Cc: Sukrut Bellary <sbellary@...libre.com>,
Nishanth Menon <nm@...com>,
linux-iio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/5] iio: adc: ti-adc128s052: Add lower resolution devices support
The adcxx communicates with a host processor via an SPI/Microwire Bus
interface. The device family responds with 12-bit data, of which the LSB bits
are transmitted by the lower resolution devices as 0.
The unavailable bits are 0 in LSB.
Shift is calculated per resolution and used in scaling and raw data read.
Lets reuse the driver to support the family of devices with name
ADC<bb><c>S<sss>, where
* bb is the resolution in number of bits (8, 10, 12)
* c is the number of channels (1, 2, 4, 8)
* sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
and 101 for 1 MSPS)
Complete datasheets are available at TI's website here:
https://www.ti.com/lit/ds/symlink/adc<bb><c>s<sss>.pdf
Tested only with ti-adc102s051 on BegalePlay SBC.
https://www.beagleboard.org/boards/beagleplay
Co-developed-by: Nishanth Menon <nm@...com>
Signed-off-by: Nishanth Menon <nm@...com>
Signed-off-by: Sukrut Bellary <sbellary@...libre.com>
---
drivers/iio/adc/ti-adc128s052.c | 51 +++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
index fbf15c83c127..b515ed0bb1d5 100644
--- a/drivers/iio/adc/ti-adc128s052.c
+++ b/drivers/iio/adc/ti-adc128s052.c
@@ -7,6 +7,21 @@
* https://www.ti.com/lit/ds/symlink/adc128s052.pdf
* https://www.ti.com/lit/ds/symlink/adc122s021.pdf
* https://www.ti.com/lit/ds/symlink/adc124s021.pdf
+ *
+ * The adcxx4s communicates with a host processor via an SPI/Microwire Bus
+ * interface. This driver supports the whole family of devices with a name
+ * ADC<bb><c>S<sss>, where
+ * bb is the resolution in number of bits (8, 10, 12)
+ * c is the number of channels (1, 2, 4, 8)
+ * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS and
+ * 101 for 1 MSPS)
+ *
+ * Complete datasheets are available at TI's website here:
+ * https://www.ti.com/lit/ds/symlink/adc<bb><c>s<sss>.pdf
+ *
+ * 8, 10, and 12 bits converters send 12-bit data with unavailable bits set to
+ * 0 in LSB.
+ * Shift is calculated per resolution and used in scaling and raw data read.
*/
#include <linux/cleanup.h>
@@ -110,8 +125,20 @@ static int adc128_read_raw(struct iio_dev *indio_dev,
}, \
}
+#define ADC082_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 8)
+#define ADC102_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 10)
#define ADC128_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 12)
+static const struct iio_chan_spec adc082s021_channels[] = {
+ ADC082_VOLTAGE_CHANNEL(0),
+ ADC082_VOLTAGE_CHANNEL(1),
+};
+
+static const struct iio_chan_spec adc102s021_channels[] = {
+ ADC102_VOLTAGE_CHANNEL(0),
+ ADC102_VOLTAGE_CHANNEL(1),
+};
+
static const struct iio_chan_spec adc122s021_channels[] = {
ADC128_VOLTAGE_CHANNEL(0),
ADC128_VOLTAGE_CHANNEL(1),
@@ -137,6 +164,18 @@ static const struct iio_chan_spec adc128s052_channels[] = {
static const char * const bd79104_regulators[] = { "iovdd" };
+static const struct adc128_configuration adc082s021_config = {
+ .channels = adc082s021_channels,
+ .num_channels = ARRAY_SIZE(adc082s021_channels),
+ .refname = "vref",
+};
+
+static const struct adc128_configuration adc102s021_config = {
+ .channels = adc102s021_channels,
+ .num_channels = ARRAY_SIZE(adc102s021_channels),
+ .refname = "vref",
+};
+
static const struct adc128_configuration adc122s021_config = {
.channels = adc122s021_channels,
.num_channels = ARRAY_SIZE(adc122s021_channels),
@@ -217,6 +256,12 @@ static int adc128_probe(struct spi_device *spi)
static const struct of_device_id adc128_of_match[] = {
{ .compatible = "rohm,bd79104", .data = &bd79104_config },
+ { .compatible = "ti,adc082s021", .data = &adc082s021_config },
+ { .compatible = "ti,adc082s051", .data = &adc082s021_config },
+ { .compatible = "ti,adc082s101", .data = &adc082s021_config },
+ { .compatible = "ti,adc102s021", .data = &adc102s021_config },
+ { .compatible = "ti,adc102s051", .data = &adc102s021_config },
+ { .compatible = "ti,adc102s101", .data = &adc102s021_config },
{ .compatible = "ti,adc122s021", .data = &adc122s021_config },
{ .compatible = "ti,adc122s051", .data = &adc122s021_config },
{ .compatible = "ti,adc122s101", .data = &adc122s021_config },
@@ -229,6 +274,12 @@ static const struct of_device_id adc128_of_match[] = {
MODULE_DEVICE_TABLE(of, adc128_of_match);
static const struct spi_device_id adc128_id[] = {
+ { "adc082s021", (kernel_ulong_t)&adc082s021_config },
+ { "adc082s051", (kernel_ulong_t)&adc082s021_config },
+ { "adc082s101", (kernel_ulong_t)&adc082s021_config },
+ { "adc102s021", (kernel_ulong_t)&adc102s021_config },
+ { "adc102s051", (kernel_ulong_t)&adc102s021_config },
+ { "adc102s101", (kernel_ulong_t)&adc102s021_config },
{ "adc122s021", (kernel_ulong_t)&adc122s021_config },
{ "adc122s051", (kernel_ulong_t)&adc122s021_config },
{ "adc122s101", (kernel_ulong_t)&adc122s021_config },
--
2.34.1
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