iio: adc: driver for ti adc081s/adc101s/adc121s

    Add Linux device driver for TI single-channel CMOS
    8/10/12-bit analog-to-digital converter with a
    high-speed serial interface.
Signed-off-by: Milan Stevanovic <milan.o.stevanovic@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ad7476.c

 /*
- * AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver
+ * Analog Devices AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver
+ * TI ADC081S/ADC101S/ADC121S 8/10/12-bit SPI ADC driver
  *
  * Copyright 2010 Analog Devices Inc.
  *
@@ -56,6 +57,9 @@ enum ad7476_supported_device_ids {
 	ID_AD7468,
 	ID_AD7495,
 	ID_AD7940,
+	ID_ADC081S,
+	ID_ADC101S,
+	ID_ADC121S,
 };
 
 static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
@@ -147,6 +151,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
 	},							\
 }
 
+#define ADC081S_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
+		BIT(IIO_CHAN_INFO_RAW))
 #define AD7476_CHAN(bits) _AD7476_CHAN((bits), 13 - (bits), \
 		BIT(IIO_CHAN_INFO_RAW))
 #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
@@ -192,6 +198,18 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
 		.channel[0] = AD7940_CHAN(14),
 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
 	},
+	[ID_ADC081S] = {
+		.channel[0] = ADC081S_CHAN(8),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADC101S] = {
+		.channel[0] = ADC081S_CHAN(10),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADC121S] = {
+		.channel[0] = ADC081S_CHAN(12),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
 };
 
 static const struct iio_info ad7476_info = {
@@ -294,6 +312,9 @@ static const struct spi_device_id ad7476_id[] = {
 	{"ad7910", ID_AD7467},
 	{"ad7920", ID_AD7466},
 	{"ad7940", ID_AD7940},
+	{"adc081s", ID_ADC081S},
+	{"adc101s", ID_ADC101S},
+	{"adc121s", ID_ADC121S},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7476_id);