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Subject[PATCH 1/2] iio: adc: at91_adc: use of_device_get_match_data() helper
This tries to solve a warning reported by the lkp bot:

>> drivers/iio/adc/at91_adc.c:1439:34: warning: unused variable
>> 'at91_adc_dt_ids' [-Wunused-const-variable]
static const struct of_device_id at91_adc_dt_ids[] = {
1 warning generated.

This shows up with 'compiler: clang version 12.0.0' and W=1 (as the bot

Forward declarations for global variables can be a bit weird; forward
function declarations are more common.

Maybe another fix for this would have been to prefix with 'extern' the
'at91_adc_dt_ids' variable, thus making it more friendly as a forward
declaration. It would look weird, but it would work.

But, we can avoid that forward declaration altogether simply by obtaining
the private data with of_device_get_match_data().

This appeared after commit 4027860dcc4c ("iio: Kconfig: at91_adc: add
COMPILE_TEST dependency to driver"), which put this driver on the lkp's bot

Reported-by: kernel test robot <>
Signed-off-by: Alexandru Ardelean <>
drivers/iio/adc/at91_adc.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 9b2c548fae95..c9ec0a4a357e 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -829,8 +829,6 @@ static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz)
return ticks;

-static const struct of_device_id at91_adc_dt_ids[];
static int at91_adc_probe_dt_ts(struct device_node *node,
struct at91_adc_state *st, struct device *dev)
@@ -878,8 +876,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
if (!node)
return -EINVAL;

- st->caps = (struct at91_adc_caps *)
- of_match_device(at91_adc_dt_ids, &pdev->dev)->data;
+ st->caps = (struct at91_adc_caps *)of_device_get_match_data(&pdev->dev);

st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");


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