linux-kernel - [PATCH 1/2] hwmon: (adm1275) Allow setting sample averaging

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Message-Id: <20220223163817.30583-2-potin.lai@quantatw.com>
Date:   Thu, 24 Feb 2022 00:38:16 +0800
From:   Potin Lai <potin.lai@...ntatw.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Patrick Williams <patrick@...cx.xyz>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Potin Lai <potin.lai@...ntatw.com>
Subject: [PATCH 1/2] hwmon: (adm1275) Allow setting sample averaging

Current driver assume PWR_AVG and VI_AVG as 1 by default, and user needs to
set sample averaging via sysfs manually.

This patch parses "pwr-avg" and "vi-avg" from device tree, and setting
sample averaging during probe.

Signed-off-by: Potin Lai <potin.lai@...ntatw.com>
---
 drivers/hwmon/pmbus/adm1275.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index d311e0557401..97faff4e3111 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -475,6 +475,7 @@ static int adm1275_probe(struct i2c_client *client)
 	int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
 	int tindex = -1;
 	u32 shunt;
+	u32 avg;
 
 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_BYTE_DATA
@@ -756,6 +757,30 @@ static int adm1275_probe(struct i2c_client *client)
 		return -ENODEV;
 	}
 
+	if (data->have_power_sampling &&
+	    of_property_read_u32(client->dev.of_node,
+				"pwr-avg", &avg) == 0) {
+		avg = clamp_val(avg, 1, ADM1275_SAMPLES_AVG_MAX);
+		ret = adm1275_write_pmon_config(data, client,
+						true, ilog2(avg));
+		if (ret < 0) {
+			dev_err(&client->dev, "set pwr-avg failed, ret = %d",
+				ret);
+			return ret;
+		}
+	}
+
+	if (of_property_read_u32(client->dev.of_node, "vi-avg", &avg) == 0) {
+		avg = clamp_val(avg, 1, ADM1275_SAMPLES_AVG_MAX);
+		ret = adm1275_write_pmon_config(data, client,
+						false, ilog2(avg));
+		if (ret < 0) {
+			dev_err(&client->dev, "set vi-avg failed, ret = %d",
+				ret);
+			return ret;
+		}
+	}
+
 	if (voindex < 0)
 		voindex = vindex;
 	if (vindex >= 0) {
-- 
2.17.1