linux-kernel - Re: [PATCH] hwmon:q54sj108a2: the PMBUS_MFR

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Message-ID: <ff2e9bf6-f82b-01ce-6206-a9882d9d4a97@roeck-us.net>
Date:   Mon, 17 May 2021 15:28:03 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chu Lin <linchuyuan@...gle.com>, linchuyuan@...il.com,
        jasonling@...gle.com, zhongqil@...gle.com, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon:q54sj108a2: the PMBUS_MFR_ID is actually 6 chars
 instead of 5

On 5/17/21 3:26 PM, Chu Lin wrote:
> The PMBUS_MFR_ID block is actually 6 chars for q54sj108a2.
> /sys/bus/i2c/drivers/q54sj108a2_test# iotools smbus_read8 $BUS $ADDR 0x99
> 0x06
> 

What is the 6th character ? Should it be checked as well ?

> Tested: Devices are able to bind to the q54sj108a2 driver successfully.
> 
> Signed-off-by: Chu Lin <linchuyuan@...gle.com>
> ---
>   drivers/hwmon/pmbus/q54sj108a2.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pmbus/q54sj108a2.c b/drivers/hwmon/pmbus/q54sj108a2.c
> index aec512766c31..0976268b2670 100644
> --- a/drivers/hwmon/pmbus/q54sj108a2.c
> +++ b/drivers/hwmon/pmbus/q54sj108a2.c
> @@ -299,7 +299,7 @@ static int q54sj108a2_probe(struct i2c_client *client)
>   		dev_err(&client->dev, "Failed to read Manufacturer ID\n");
>   		return ret;
>   	}
> -	if (ret != 5 || strncmp(buf, "DELTA", 5)) {
> +	if (ret != 6 || strncmp(buf, "DELTA", 5)) {
>   		buf[ret] = '\0';
>   		dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
>   		return -ENODEV;
>