linux-kernel - Re: [PATCH 06/15] ARM: dts: ipq4019: Add ipq4019-ap.dk04.dtsi

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Date:   Tue, 6 Feb 2018 11:31:10 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     mark.rutland@....com, robh@...nel.org, devicetree@...r.kernel.org,
        catalin.marinas@....com, will.deacon@....com,
        linux@...linux.org.uk, bjorn.andersson@...aro.org,
        david.brown@...aro.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, andy.gross@...aro.org,
        linux-arm-msm-owner@...r.kernel.org, linux-soc@...r.kernel.org,
        sboyd@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/15] ARM: dts: ipq4019: Add ipq4019-ap.dk04.dtsi

Hi Abhishek,

On 2/3/2018 4:47 PM, Abhishek Sahu wrote:
> On 2018-01-29 10:41, Sricharan R wrote:
>> Add the common parts for the dk04 boards.
>>
>> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
>> ---
>>  arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1.dtsi | 147
> 
>  <snip>
>> +
>> +            nand_pins: nand_pins {
>> +                pullups {
>> +                    pins = "gpio52", "gpio53",
>> "gpio58",
>> +                        "gpio59";
>> +                    function = "qpic";
>> +                    bias-pull-up;
>> +                };
>> +
>> +                pulldowns {
>> +                    pins = "gpio54", "gpio55",
>> "gpio56",
>> +                        "gpio57", "gpio60",
>> "gpio61",
>> +                        "gpio62", "gpio63",
>> "gpio64",
>> +                        "gpio65", "gpio66",
>> "gpio67",
>> +                        "gpio68", "gpio69";
>> +                    function = "qpic";
>> +                    bias-pull-down;
>> +                };
>> +            };
> 
>  Can you please check once why do we need pull-up and
>  pull-down for NAND pins. The NAND chip will be mounted
>  over board itself so board design should take care of
>  required pull up and pull downs.
> 

  Mostly because, these are always **weak** pull up/down as defaults
  and should be overridden by the ones in the board (if there).


>  Also, some of the above pins like gpio52 will be only used
>  for LCD so we can remove those pins. Later on, when LCD
>  support will be added, we can add those pins.
 ok

Regards,
 Sricharan

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