linux-kernel - [PATCH 2/3] iio: adc: ltc2497: add support for LTC2495

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Message-Id: <20250812-ltc2495-v1-2-7bf4c6feec2e@gmail.com>
Date: Tue, 12 Aug 2025 19:04:11 +0200
From: Yusuf Alper Bilgin <y.alperbilgin@...il.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Liam Beguin <liambeguin@...il.com>
Cc: Michael Hennerich <michael.hennerich@...log.com>, 
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Yusuf Alper Bilgin <y.alperbilgin@...il.com>
Subject: [PATCH 2/3] iio: adc: ltc2497: add support for LTC2495

This updates the LTC2497 driver to also support the LTC2495.

Signed-off-by: Yusuf Alper Bilgin <y.alperbilgin@...il.com>
---
 drivers/iio/adc/ltc2497-core.c | 20 +++++++++-----------
 drivers/iio/adc/ltc2497.c      |  7 +++++++
 drivers/iio/adc/ltc2497.h      |  4 +---
 3 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c
index 2dc5c704426949a4ec62c42591d6c2c40ffb79cc..400f4fe5af30e8e16b75506726235f10f2a4237f 100644
--- a/drivers/iio/adc/ltc2497-core.c
+++ b/drivers/iio/adc/ltc2497-core.c
@@ -15,9 +15,12 @@
 
 #include "ltc2497.h"
 
-#define LTC2497_SGL			BIT(4)
-#define LTC2497_DIFF			0
-#define LTC2497_SIGN			BIT(3)
+#define LTC2497_CONFIG_DEFAULT		LTC2497_ENABLE
+#define LTC2497_CONVERSION_TIME_MS	150ULL
+
+#define LTC2497_SGL	BIT(4)
+#define LTC2497_DIFF	0
+#define LTC2497_SIGN	BIT(3)
 
 static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata)
 {
@@ -26,20 +29,15 @@ static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata)
 	time_elapsed = ktime_ms_delta(ktime_get(), ddata->time_prev);
 
 	if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
-		/* delay if conversion time not passed
-		 * since last read or write
-		 */
-		if (msleep_interruptible(
-		    LTC2497_CONVERSION_TIME_MS - time_elapsed))
+		/* delay if conversion time not passed since last read or write */
+		if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS - time_elapsed))
 			return -ERESTARTSYS;
 
 		return 0;
 	}
 
 	if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
-		/* We're in automatic mode -
-		 * so the last reading is still not outdated
-		 */
+		/* We're in automatic mode - so the last reading is still not outdated */
 		return 0;
 	}
 
diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c
index eb9d521e86e54def0493ea0e81f63b37900c56a5..8f4665547b5b0d32084599f8557c40102c37a4ce 100644
--- a/drivers/iio/adc/ltc2497.c
+++ b/drivers/iio/adc/ltc2497.c
@@ -19,6 +19,7 @@
 #include "ltc2497.h"
 
 enum ltc2497_chip_type {
+	TYPE_LTC2495,
 	TYPE_LTC2497,
 	TYPE_LTC2499,
 };
@@ -131,6 +132,10 @@ static void ltc2497_remove(struct i2c_client *client)
 }
 
 static const struct ltc2497_chip_info ltc2497_info[] = {
+	[TYPE_LTC2495] = {
+		.resolution = 16,
+		.name = "ltc2495",
+	},
 	[TYPE_LTC2497] = {
 		.resolution = 16,
 		.name = NULL,
@@ -142,6 +147,7 @@ static const struct ltc2497_chip_info ltc2497_info[] = {
 };
 
 static const struct i2c_device_id ltc2497_id[] = {
+	{ "ltc2495", (kernel_ulong_t)&ltc2497_info[TYPE_LTC2495] },
 	{ "ltc2497", (kernel_ulong_t)&ltc2497_info[TYPE_LTC2497] },
 	{ "ltc2499", (kernel_ulong_t)&ltc2497_info[TYPE_LTC2499] },
 	{ }
@@ -149,6 +155,7 @@ static const struct i2c_device_id ltc2497_id[] = {
 MODULE_DEVICE_TABLE(i2c, ltc2497_id);
 
 static const struct of_device_id ltc2497_of_match[] = {
+	{ .compatible = "lltc,ltc2495", .data = &ltc2497_info[TYPE_LTC2495] },
 	{ .compatible = "lltc,ltc2497", .data = &ltc2497_info[TYPE_LTC2497] },
 	{ .compatible = "lltc,ltc2499", .data = &ltc2497_info[TYPE_LTC2499] },
 	{ }
diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h
index 64e81c95a3dd05911b6717c09ac0560c9f47f304..f2139f260c3fe4e8772c6db9c46331de775dcd5c 100644
--- a/drivers/iio/adc/ltc2497.h
+++ b/drivers/iio/adc/ltc2497.h
@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#define LTC2497_ENABLE			0xA0
-#define LTC2497_CONFIG_DEFAULT		LTC2497_ENABLE
-#define LTC2497_CONVERSION_TIME_MS	150ULL
+#define LTC2497_ENABLE	0xA0
 
 struct ltc2497_chip_info {
 	u32 resolution;

-- 
2.43.0