linux-kernel - [PATCH] iio: adc: ad_sigma_delta: Select IIO_BUFFER_DMAENGINE and SPI

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Message-Id: <20250714-iio-ad_sigma_delta-fix-kconfig-selects-v1-1-32e0d6da0423@kernel.org>
Date: Mon, 14 Jul 2025 11:30:04 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>
Cc: Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, linux-iio@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH] iio: adc: ad_sigma_delta: Select IIO_BUFFER_DMAENGINE and
 SPI_OFFLOAD

CONFIG_AD_SIGMA_DELTA uses several symbols that it does not explicitly
select. If no other enabled driver selects them, the build fails with
either a linker failure if the driver is built in or a modpost failure
if the driver is a module.

  ld.lld: error: undefined symbol: devm_spi_offload_rx_stream_request_dma_chan
  ld.lld: error: undefined symbol: devm_iio_dmaengine_buffer_setup_with_handle
  ld.lld: error: undefined symbol: devm_spi_offload_trigger_get
  ld.lld: error: undefined symbol: devm_spi_offload_get
  ld.lld: error: undefined symbol: spi_offload_trigger_enable
  ld.lld: error: undefined symbol: spi_offload_trigger_disable

Select the necessary Kconfig symbols to include these functions in the
build to clear up the errors.

Fixes: 219da3ea842a ("iio: adc: ad_sigma_delta: add SPI offload support")
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 drivers/iio/adc/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index d43edc7b0c0f..6de2abad0197 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -22,7 +22,9 @@ config AB8500_GPADC
 config AD_SIGMA_DELTA
 	tristate
 	select IIO_BUFFER
+	select IIO_BUFFER_DMAENGINE
 	select IIO_TRIGGERED_BUFFER
+	select SPI_OFFLOAD
 
 config AD4000
 	tristate "Analog Devices AD4000 ADC Driver"

---
base-commit: 1d71d4a318fb911ff9594d82c9fbd206e510b32f
change-id: 20250714-iio-ad_sigma_delta-fix-kconfig-selects-6e7d3c83883d

Best regards,
--  
Nathan Chancellor <nathan@...nel.org>