2 files changed, 5 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/arm/atmel-adc.txt b/Documentation/devicetree/bindings/arm/atmel-adc.txt
index 723c205cb10d..0e65e0137487 100644
--- a/Documentation/devicetree/bindings/arm/atmel-adc.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-adc.txt
@@ -7,7 +7,6 @@ Required properties:
   - interrupts: Should contain the IRQ line for the ADC
   - atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
     device
-  - atmel,adc-num-channels: Number of channels available in the ADC
   - atmel,adc-startup-time: Startup Time of the ADC in microseconds as
     defined in the datasheet
   - atmel,adc-vref: Reference voltage in millivolts for the conversions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index abce01b9ff91..690a560e0dab 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -43,6 +43,7 @@ struct at91_adc_caps {
         /* startup time calculate function */
         u32 (*calc_startup_ticks)(u8 startup_time, u32 adc_clk_khz);
 
+        u8      num_channels;
         struct at91_adc_reg_desc registers;
 };
 
@@ -496,13 +497,6 @@ static int at91_adc_probe_dt(struct at91_adc_state *st,
         }
         st->channels_mask = prop;
 
-        if (of_property_read_u32(node, "atmel,adc-num-channels", &prop)) {
-                dev_err(&idev->dev, "Missing adc-num-channels property in the DT.\n");
-                ret = -EINVAL;
-                goto error_ret;
-        }
-        st->num_channels = prop;
-
         st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");
 
         if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
@@ -528,6 +522,7 @@ static int at91_adc_probe_dt(struct at91_adc_state *st,
                 goto error_ret;
 
         st->registers = &st->caps->registers;
+        st->num_channels = st->caps->num_channels;
         st->trigger_number = of_get_child_count(node);
         st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
                                         sizeof(struct at91_adc_trigger),
@@ -773,6 +768,7 @@ static int at91_adc_remove(struct platform_device *pdev)
 #ifdef CONFIG_OF
 static struct at91_adc_caps at91sam9260_caps = {
         .calc_startup_ticks = calc_startup_ticks_9260,
+        .num_channels = 4,
         .registers = {
                 .channel_base = AT91_ADC_CHR(0),
                 .drdy_mask = AT91_ADC_DRDY,
@@ -785,6 +781,7 @@ static struct at91_adc_caps at91sam9260_caps = {
 
 static struct at91_adc_caps at91sam9g45_caps = {
         .calc_startup_ticks = calc_startup_ticks_9260,  /* same as 9260 */
+        .num_channels = 8,
         .registers = {
                 .channel_base = AT91_ADC_CHR(0),
                 .drdy_mask = AT91_ADC_DRDY,
@@ -797,6 +794,7 @@ static struct at91_adc_caps at91sam9g45_caps = {
 
 static struct at91_adc_caps at91sam9x5_caps = {
         .calc_startup_ticks = calc_startup_ticks_9x5,
+        .num_channels = 12,
         .registers = {
                 .channel_base = AT91_ADC_CDR0_9X5,
                 .drdy_mask = AT91_ADC_SR_DRDY_9X5,