linux-kernel - [PATCH v2 1/2] hwmon: ina238: add ina237 support

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Date:   Thu, 26 Oct 2023 09:08:49 +0200
From:   Richard Leitner <richard.leitner@...ux.dev>
To:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org,
        Richard Leitner <richard.leitner@...ux.dev>
Subject: [PATCH v2 1/2] hwmon: ina238: add ina237 support

The INA237 "85-V, 16-Bit, Precision Power Monitor With I2C Interface" is
basically the same as INA328. Therefore add a corresponding compatible
to the driver.

According to the datasheet the main difference is the current and power
monitoring accuracy:

+------------------------+---------------+---------------+
|                        | INA238        | INA237        |
+------------------------+---------------+---------------+
| Offset voltage         | +/- 5µV       | +/- 50µV      |
| Offset drift           | +/- 0.02µV/°C | +/- 0.02µV/°C |
| Gain error             | +/- 0.1%      | +/- 0.3%      |
| Gain error drift       | +/- 25ppm/°C  | +/- 50ppm/°C  |
| Common mode rejection  | 140dB         | 120dB         |
| Power accuracy         | 0.7%          | 1.6%          |
+------------------------+---------------+---------------+

As well as the missing DEVICE_ID register at 0x3F, which is currently
not in use by the driver.

Signed-off-by: Richard Leitner <richard.leitner@...ux.dev>
---
 drivers/hwmon/ina238.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/ina238.c b/drivers/hwmon/ina238.c
index f519c22d3907..ca9f5d2c811b 100644
--- a/drivers/hwmon/ina238.c
+++ b/drivers/hwmon/ina238.c
@@ -33,7 +33,7 @@
 #define INA238_BUS_UNDER_VOLTAGE	0xf
 #define INA238_TEMP_LIMIT		0x10
 #define INA238_POWER_LIMIT		0x11
-#define INA238_DEVICE_ID		0x3f
+#define INA238_DEVICE_ID		0x3f /* not available on INA237 */
 
 #define INA238_CONFIG_ADCRANGE		BIT(4)
 
@@ -622,6 +622,7 @@ static const struct i2c_device_id ina238_id[] = {
 MODULE_DEVICE_TABLE(i2c, ina238_id);
 
 static const struct of_device_id __maybe_unused ina238_of_match[] = {
+	{ .compatible = "ti,ina237" },
 	{ .compatible = "ti,ina238" },
 	{ },
 };

-- 
2.40.1