ENGR00301869-1 iio: adc: Enable i.MX6SX adc driver.

Enable i.MX6SX adc driver. ADC driver will try getting ADC controller
channel number via device tree, because i.MX chip enable 4 channels
on each controller.

Signed-off-by: Luwei Zhou <b45643@freescale.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 37f542e8233c..96d844df0b71 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -1,7 +1,7 @@
 /*
  * Freescale Vybrid vf610 ADC driver
  *
- * Copyright 2013 Freescale Semiconductor, Inc.
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -553,6 +553,7 @@ static int vf610_adc_probe(struct platform_device *pdev)
         struct resource *mem;
         int irq;
         int ret;
+        u32 channels;
 
         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct vf610_adc));
         if (!indio_dev) {
@@ -604,13 +605,18 @@ static int vf610_adc_probe(struct platform_device *pdev)
 
         init_completion(&info->completion);
 
+        ret  = of_property_read_u32(pdev->dev.of_node,
+                                        "num-channels", &channels);
+        if (ret)
+                channels = ARRAY_SIZE(vf610_adc_iio_channels);
+
         indio_dev->name = dev_name(&pdev->dev);
         indio_dev->dev.parent = &pdev->dev;
         indio_dev->dev.of_node = pdev->dev.of_node;
         indio_dev->info = &vf610_adc_iio_info;
         indio_dev->modes = INDIO_DIRECT_MODE;
         indio_dev->channels = vf610_adc_iio_channels;
-        indio_dev->num_channels = ARRAY_SIZE(vf610_adc_iio_channels);
+        indio_dev->num_channels = (int)channels;
 
         ret = clk_prepare_enable(info->clk);
         if (ret) {