lkml.org 
[lkml]   [2018]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 06/15] ARM: dts: ipq4019: Add ipq4019-ap.dk04.dtsi
From
Date
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@codeaurora.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

--
"QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

\
 
 \ /
  Last update: 2018-02-06 07:01    [W:0.068 / U:0.716 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site