linux-kernel - Re: [PATCH] ARM: dts: at91: sama7g5ek: enable pull-up on flexcom3 console lines

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Date:   Wed, 13 Apr 2022 10:38:43 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Tudor Ambarus - M18064 <Tudor.Ambarus@...rochip.com>,
        "Eugen Hristev - M18282" <Eugen.Hristev@...rochip.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Claudiu Beznea - M18063 <Claudiu.Beznea@...rochip.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH] ARM: dts: at91: sama7g5ek: enable pull-up on flexcom3
 console lines

On 08/03/2022 at 09:21, Tudor Ambarus - M18064 wrote:
> On 3/7/22 13:38, Eugen Hristev wrote:
>> Flexcom3 is used as board console serial. There are no pull-ups on these
>> lines on the board. This means that if a cable is not connected (that has
>> pull-ups included), stray characters could appear on the console as the
>> floating pins voltage levels are interpreted as incoming characters.
>> To avoid this problem, enable the internal pull-ups on these lines.
>>
>> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> 
> Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
and queued for "fixes". Thanks!
Best regards,
   Nicolas

> 
>> ---
>>   arch/arm/boot/dts/at91-sama7g5ek.dts | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-sama7g5ek.dts
>> index 08685a10eda1d..dd047a8523907 100644
>> --- a/arch/arm/boot/dts/at91-sama7g5ek.dts
>> +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
>> @@ -495,7 +495,7 @@ pinctrl_flx0_default: flx0_default {
>>   	pinctrl_flx3_default: flx3_default {
>>   		pinmux = <PIN_PD16__FLEXCOM3_IO0>,
>>   			 <PIN_PD17__FLEXCOM3_IO1>;
>> -		bias-disable;
>> +		bias-pull-up;
>>   	};
>>   
>>   	pinctrl_flx4_default: flx4_default {
> 


-- 
Nicolas Ferre