[PATCH 2/3] iio: DAC extension for ltc2634-12/10/8

Chris Ruehl
2020-04-14T06:27:29Z

This patch add support for Analog Devices (Linear Technology)
LTC2634 Quad 12-/10-/8-Bit Rail-to-Rail DAC.
The SPI functionality based on them from LTC2632 therefor
add the definitions only and update the Kconfig.

V2:
Send the documentation fix in a extra patch
Kconfig simplify the driver description, details to the help text
ltc2632.txt add to this patch-set (prepare to convert to yaml)

Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
---
.../devicetree/bindings/iio/dac/ltc2632.txt | 8 ++-
drivers/iio/dac/Kconfig | 6 +-
drivers/iio/dac/ltc2632.c | 60 +++++++++++++++++++
3 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/dac/ltc2632.txt b/Documentation/devicetree/bindings/iio/dac/ltc2632.txt
index 338c3220f01a..1ab9570cf219 100644
--- a/Documentation/devicetree/bindings/iio/dac/ltc2632.txt
+++ b/Documentation/devicetree/bindings/iio/dac/ltc2632.txt
@@ -1,4 +1,4 @@
-Linear Technology LTC2632/2636 DAC
+Linear Technology LTC2632/2634/2636 DAC

Required properties:
- compatible: Has to contain one of the following:
@@ -8,6 +8,12 @@ Required properties:
lltc,ltc2632-h12
lltc,ltc2632-h10
lltc,ltc2632-h8
+ lltc,ltc2634-l12
+ lltc,ltc2634-l10
+ lltc,ltc2634-l8
+ lltc,ltc2634-h12
+ lltc,ltc2634-h10
+ lltc,ltc2634-h8
lltc,ltc2636-l12
lltc,ltc2636-l10
lltc,ltc2636-l8
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 93744011b63f..aee13ced6ddf 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -279,12 +279,12 @@ config LTC1660
module will be called ltc1660.

config LTC2632
- tristate "Linear Technology LTC2632-12/10/8 and LTC2636-12/10/8 DAC spi driver"
+ tristate "Linear Technology LTC2632-12/10/8 and similar DAC spi driver"
depends on SPI
help
Say yes here to build support for Linear Technology
- LTC2632-12, LTC2632-10, LTC2632-8, LTC2636-12, LTC2636-10 and
- LTC2636-8 converters (DAC).
+ LTC2632, LTC2634 and LTC2636 DAC resolution 12/10/8 bit
+ low 0-2.5V and high 0-4,096V range converters.

To compile this driver as a module, choose M here: the
module will be called ltc2632.
diff --git a/drivers/iio/dac/ltc2632.c b/drivers/iio/dac/ltc2632.c
index 2a84ea654645..e939d7f81014 100644
--- a/drivers/iio/dac/ltc2632.c
+++ b/drivers/iio/dac/ltc2632.c
@@ -54,6 +54,12 @@ enum ltc2632_supported_device_ids {
ID_LTC2632H12,
ID_LTC2632H10,
ID_LTC2632H8,
+ ID_LTC2634L12,
+ ID_LTC2634L10,
+ ID_LTC2634L8,
+ ID_LTC2634H12,
+ ID_LTC2634H10,
+ ID_LTC2634H8,
ID_LTC2636L12,
ID_LTC2636L10,
ID_LTC2636L8,
@@ -236,6 +242,36 @@ static const struct ltc2632_chip_info ltc2632_chip_info_tbl[] = {
.num_channels = 2,
.vref_mv = 4096,
},
+ [ID_LTC2634L12] = {
+ .channels = ltc2632x12_channels,
+ .num_channels = 4,
+ .vref_mv = 2500,
+ },
+ [ID_LTC2634L10] = {
+ .channels = ltc2632x10_channels,
+ .num_channels = 4,
+ .vref_mv = 2500,
+ },
+ [ID_LTC2634L8] = {
+ .channels = ltc2632x8_channels,
+ .num_channels = 4,
+ .vref_mv = 2500,
+ },
+ [ID_LTC2634H12] = {
+ .channels = ltc2632x12_channels,
+ .num_channels = 4,
+ .vref_mv = 4096,
+ },
+ [ID_LTC2634H10] = {
+ .channels = ltc2632x10_channels,
+ .num_channels = 4,
+ .vref_mv = 4096,
+ },
+ [ID_LTC2634H8] = {
+ .channels = ltc2632x8_channels,
+ .num_channels = 4,
+ .vref_mv = 4096,
+ },
[ID_LTC2636L12] = {
.channels = ltc2632x12_channels,
.num_channels = 8,
@@ -357,6 +393,12 @@ static const struct spi_device_id ltc2632_id[] = {
{ "ltc2632-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H12] },
{ "ltc2632-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H10] },
{ "ltc2632-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2632H8] },
+ { "ltc2634-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L12] },
+ { "ltc2634-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L10] },
+ { "ltc2634-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634L8] },
+ { "ltc2634-h12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H12] },
+ { "ltc2634-h10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H10] },
+ { "ltc2634-h8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2634H8] },
{ "ltc2636-l12", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L12] },
{ "ltc2636-l10", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L10] },
{ "ltc2636-l8", (kernel_ulong_t)&ltc2632_chip_info_tbl[ID_LTC2636L8] },
@@ -386,6 +428,24 @@ static const struct of_device_id ltc2632_of_match[] = {
}, {
.compatible = "lltc,ltc2632-h8",
.data = &ltc2632_chip_info_tbl[ID_LTC2632H8]
+ }, {
+ .compatible = "lltc,ltc2634-l12",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634L12]
+ }, {
+ .compatible = "lltc,ltc2634-l10",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634L10]
+ }, {
+ .compatible = "lltc,ltc2634-l8",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634L8]
+ }, {
+ .compatible = "lltc,ltc2634-h12",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634H12]
+ }, {
+ .compatible = "lltc,ltc2634-h10",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634H10]
+ }, {
+ .compatible = "lltc,ltc2634-h8",
+ .data = &ltc2632_chip_info_tbl[ID_LTC2634H8]
}, {
.compatible = "lltc,ltc2636-l12",
.data = &ltc2632_chip_info_tbl[ID_LTC2636L12]
--
2.20.1