iio: adc: mcp320x: Add support for mcp3301

This adds support for Microchip's 13 bit 1 channel AD converter MCP3301

Signed-off-by: Andrea Galbusera <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

Documentation/devicetree/bindings/iio/adc/mcp320x.txt

···
 				"mcp3202"
 				"mcp3204"
 				"mcp3208"
+				"mcp3301"
 
 
 Examples:

drivers/iio/adc/Kconfig

···
 	depends on SPI
 	help
 	  Say yes here to build support for Microchip Technology's
-	  MCP3001, MCP3002, MCP3004, MCP3008, MCP3201, MCP3202, MCP3204 or
-	  MCP3208 analog to digital converter.
+	  MCP3001, MCP3002, MCP3004, MCP3008, MCP3201, MCP3202, MCP3204,
+	  MCP3208 or MCP3301 analog to digital converter.
 
 	  This driver can also be built as a module. If so, the module will be
 	  called mcp320x.

drivers/iio/adc/mcp320x.c

···
  * http://ww1.microchip.com/downloads/en/DeviceDoc/21290D.pdf  mcp3201
  * http://ww1.microchip.com/downloads/en/DeviceDoc/21034D.pdf  mcp3202
  * http://ww1.microchip.com/downloads/en/DeviceDoc/21298c.pdf  mcp3204/08
+ * http://ww1.microchip.com/downloads/en/DeviceDoc/21700E.pdf  mcp3301
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
···
 	mcp3202,
 	mcp3204,
 	mcp3208,
+	mcp3301,
 };
 
 struct mcp320x_chip_info {
···
 	switch (device_index) {
 	case mcp3001:
 	case mcp3201:
+	case mcp3301:
 		return 0;
 	case mcp3002:
 	case mcp3202:
···
 	adc->tx_buf = mcp320x_channel_to_tx_data(device_index,
 						channel, differential);
 
-	if (device_index != mcp3001 && device_index != mcp3201) {
+	if (device_index != mcp3001 && device_index != mcp3201 && device_index != mcp3301) {
 		ret = spi_sync(adc->spi, &adc->msg);
 		if (ret < 0)
 			return ret;
···
 	case mcp3204:
 	case mcp3208:
 		return (adc->rx_buf[0] << 4 | adc->rx_buf[1] >> 4);
+	case mcp3301:
+		return sign_extend32((adc->rx_buf[0] & 0x1f) << 8 | adc->rx_buf[1], 12);
 	default:
 		return -EINVAL;
 	}
···
 		.num_channels = ARRAY_SIZE(mcp3208_channels),
 		.resolution = 12
 	},
+	[mcp3301] = {
+		.channels = mcp3201_channels,
+		.num_channels = ARRAY_SIZE(mcp3201_channels),
+		.resolution = 13
+	},
 };
 
 static int mcp320x_probe(struct spi_device *spi)
···
 		.compatible = "mcp3208",
 		.data = &mcp320x_chip_infos[mcp3208],
 	}, {
+		.compatible = "mcp3301",
+		.data = &mcp320x_chip_infos[mcp3301],
+	}, {
 	}
 };
 MODULE_DEVICE_TABLE(of, mcp320x_dt_ids);
···
 	{ "mcp3202", mcp3202 },
 	{ "mcp3204", mcp3204 },
 	{ "mcp3208", mcp3208 },
+	{ "mcp3301", mcp3301 },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, mcp320x_id);