linux-kernel - [PATCH] iio: adc: ad7949: use spi_is_bpw

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Message-Id: <20250611-iio-adc-ad7949-use-spi_is_bpw_supported-v1-1-c4e15bfd326e@baylibre.com>
Date: Wed, 11 Jun 2025 10:04:58 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: Da Xue <da@...re.computer>, linux-iio@...r.kernel.org, 
 linux-kernel@...r.kernel.org, David Lechner <dlechner@...libre.com>
Subject: [PATCH] iio: adc: ad7949: use spi_is_bpw_supported()

Use spi_is_bpw_supported() instead of directly accessing spi->controller
->bits_per_word_mask. bits_per_word_mask may be 0, which implies that
8-bits-per-word is supported. spi_is_bpw_supported() takes this into
account while spi_ctrl_mask == SPI_BPW_MASK(8) does not.

Closes: https://lore.kernel.org/linux-spi/c8b8a963-6cef-4c9b-bfef-dab2b7bd0b0f@sirena.org.uk/
Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7949.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c
index edd0c3a35ab73cca5ff87632e4d588eb5d712b47..202561cad4012b67e23ad6d3623c913cfef35e68 100644
--- a/drivers/iio/adc/ad7949.c
+++ b/drivers/iio/adc/ad7949.c
@@ -308,7 +308,6 @@ static void ad7949_disable_reg(void *reg)
 
 static int ad7949_spi_probe(struct spi_device *spi)
 {
-	u32 spi_ctrl_mask = spi->controller->bits_per_word_mask;
 	struct device *dev = &spi->dev;
 	const struct ad7949_adc_spec *spec;
 	struct ad7949_adc_chip *ad7949_adc;
@@ -337,11 +336,11 @@ static int ad7949_spi_probe(struct spi_device *spi)
 	ad7949_adc->resolution = spec->resolution;
 
 	/* Set SPI bits per word */
-	if (spi_ctrl_mask & SPI_BPW_MASK(ad7949_adc->resolution)) {
+	if (spi_is_bpw_supported(spi, ad7949_adc->resolution)) {
 		spi->bits_per_word = ad7949_adc->resolution;
-	} else if (spi_ctrl_mask == SPI_BPW_MASK(16)) {
+	} else if (spi_is_bpw_supported(spi, 16)) {
 		spi->bits_per_word = 16;
-	} else if (spi_ctrl_mask == SPI_BPW_MASK(8)) {
+	} else if (spi_is_bpw_supported(spi, 8)) {
 		spi->bits_per_word = 8;
 	} else {
 		dev_err(dev, "unable to find common BPW with spi controller\n");

---
base-commit: 4c6073fec2fee4827fa0dd8a4ab4e6f7bbc05ee6
change-id: 20250611-iio-adc-ad7949-use-spi_is_bpw_supported-17f1293abf88

Best regards,
-- 
David Lechner <dlechner@...libre.com>