linux-kernel - [PATCH] iio: adc: ad7476: Support ROHM BU79100G

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Message-ID: <aDk2qNE9LTVnfAFM@mva-rohm>
Date: Fri, 30 May 2025 07:40:08 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iio: adc: ad7476: Support ROHM BU79100G

ROHM BU79100G is a 12-bit, single channel ADC. From the software point
of view it is identical to the TI's ADS7866. Support reading ADC
measurements using the ad7476.c

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---

Please, see the relevant discussion (as to why an ID for a fallback is
added) in:
https://lore.kernel.org/all/f8ec547a-5924-4563-aa1d-dde8227844fa@gmail.com/

This patch was based on v6.15-rc1. I can rebase if needed.

 drivers/iio/adc/ad7476.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 37b0515cf4fc..d48ee8f1d547 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -435,6 +435,13 @@ static const struct spi_device_id ad7476_id[] = {
 	{ "ads7866", ID_ADS7866 },
 	{ "ads7867", ID_ADS7867 },
 	{ "ads7868", ID_ADS7868 },
+	/*
+	 * The ROHM BU79100G is identical to the TI's ADS7866 from the software
+	 * point of view. The binding document mandates the ADS7866 to be
+	 * marked as a fallback for the BU79100G, but we still need the SPI ID
+	 * here to make the module loading work.
+	 */
+	{ "bu79100g", ID_ADS7866 },
 	{ "ltc2314-14", ID_LTC2314_14 },
 	{ }
 };
-- 
2.49.0


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