From: Guenter Roeck <linux@roeck-us.net>
To: Potin Lai <potin.lai@quantatw.com>,
Jean Delvare <jdelvare@suse.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>
Cc: Patrick Williams <patrick@stwcx.xyz>,
linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH 1/2] hwmon: (adm1275) Allow setting sample averaging
Date: Wed, 23 Feb 2022 09:10:38 -0800 [thread overview]
Message-ID: <7cc6f708-9b9a-db6a-8048-8caa6ed57700@roeck-us.net> (raw)
In-Reply-To: <20220223163817.30583-2-potin.lai@quantatw.com>
On 2/23/22 08:38, Potin Lai wrote:
> 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@quantatw.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) {
Those properties will need a better name and will have to be prefixed
by the chip vendor.
> + avg = clamp_val(avg, 1, ADM1275_SAMPLES_AVG_MAX);
clamp_val() is inappropriate for devicetree properties.
The property definition needs to include a valid range, and that range
needs to be validated and rejected if invalid.
> + 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",
This needs to be more descriptive, eg "Setting voltage average failed, ...".
Same above.
> + ret);
> + return ret;
> + }
> + }
> +
> if (voindex < 0)
> voindex = vindex;
> if (vindex >= 0) {
next prev parent reply other threads:[~2022-02-23 17:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 16:38 [PATCH 0/2] hwmon: (adm1275) Add sample averaging binding support Potin Lai
2022-02-23 16:38 ` [PATCH 1/2] hwmon: (adm1275) Allow setting sample averaging Potin Lai
2022-02-23 17:10 ` Guenter Roeck [this message]
2022-02-23 16:38 ` [PATCH 2/2] dt-bindings: hwmon: Add sample averaging property for ADM1275 Potin Lai
2022-02-23 17:14 ` Krzysztof Kozlowski
2022-02-23 17:15 ` Guenter Roeck
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