linux-kernel - Re: [PATCH v1 2/2] hwmon: pmbus: Add ltc4286 driver

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Message-ID: <20230425134537.pzsplcpkrog2552r@intel.intel>
Date:   Tue, 25 Apr 2023 15:45:37 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
Cc:     patrick@...cx.xyz, Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-i2c@...r.kernel.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] hwmon: pmbus: Add ltc4286 driver

Hi Delphine,

On top of Guenter's comments,

[...]

> +config SENSORS_LTC4286
> +	bool "Linear Technologies LTC4286"
> +	help
> +	  If you say yes here you get hardware monitoring support for Linear
> +	  Technology LTC4286.

could you add a couple of words more here?

[...]

> +static int ltc4286_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	int ret;
> +	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
> +	struct device *dev = &client->dev;
> +	struct pmbus_driver_info *info;
> +	u32 rsense;
> +
> +	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed to read manufacturer id\n");

you can use dev_err_probe() here:

	return dev_err_probe(&client->dev, err, "failed to read manufacturer id\n");

> +		return ret;
> +	}
> +
> +	/* Refer to ltc4286 datasheet page 20
> +	 * the default manufacturer id is LTC
> +	 */
> +	if (ret != LTC4286_MFR_ID_SIZE ||
> +	    strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) {
> +		dev_err(&client->dev, "unsupported manufacturer id\n");
> +		return -ENODEV;
> +	}
> +
> +	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed to read manufacturer model\n");
> +		return ret;
> +	}

Is this read really needed?

Andi

[...]