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Date:   Tue, 19 May 2020 13:41:40 -0500
From:   Dan Murphy <>
To:     Andrew Lunn <>, Jakub Kicinski <>
CC:     <>, <>,
        <>, <>,
        <>, <>
Subject: Re: [PATCH net-next 2/4] net: phy: dp83869: Set opmode from straps


On 5/19/20 1:29 PM, Andrew Lunn wrote:
> On Tue, May 19, 2020 at 09:58:18AM -0700, Jakub Kicinski wrote:
>> On Tue, 19 May 2020 09:18:11 -0500 Dan Murphy wrote:
>>> If the op-mode for the device is not set in the device tree then set
>>> the strapped op-mode and store it for later configuration.
>>> Signed-off-by: Dan Murphy <>
>> ../drivers/net/phy/dp83869.c: In function0 dp83869_set_strapped_mode:
>> ../drivers/net/phy/dp83869.c:171:10: warning: comparison is always false due to limited range of data type [-Wtype-limits]
>>    171 |  if (val < 0)
>>        |          ^
> Hi Jakub
> This happens a lot with PHY drivers. The register being read is a u16,
> so that is what people use.

Yes this is what happened but phy_read_mmd returns an int so the 
declaration of val should be an int.

I will update that in v2

> Is this now a standard GCC warning? Or have you turned on extra
> checking?
I still was not able to reproduce this warning with gcc-9.2.  I would 
like to know the same


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