linux-kernel - Re: [PATCH v2 0/3] increase TSCADC clock to 24MHz and fix ti,charge-delay to represent in nS

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Message-ID: <bed2095b-9a1b-3740-6f57-f2766ad65cde@ti.com>
Date:   Mon, 5 Dec 2016 09:24:57 +0530
From:   Mugunthan V N <mugunthanvnm@...com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:     Lee Jones <lee.jones@...aro.org>, <linux-input@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>, Vignesh R <vigneshr@...com>,
        <devicetree@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] increase TSCADC clock to 24MHz and fix
 ti,charge-delay to represent in nS

Hi Lee Jones

On Wednesday 30 November 2016 02:39 AM, Dmitry Torokhov wrote:
> On Tue, Nov 29, 2016 at 11:11:35AM +0530, Mugunthan V N wrote:
>> On Friday 25 November 2016 03:29 PM, Lee Jones wrote:
>>> On Fri, 25 Nov 2016, Mugunthan V N wrote:
>>>
>>>> Hi Dmitry Torokhov,
>>>>
>>>> On Thursday 10 November 2016 10:05 PM, Mugunthan V N wrote:
>>>>> This patch series enables ADC to be clocked at 24MHz as the
>>>>> TI AM335x ADC driver has already adopted to use DMA to transfer
>>>>> ADC samples. Now ADC can generated upto 800K Samples per second
>>>>> with the patch [1] on AM335x BBB and AM437x GP EVM.
>>>>>
>>>>> when ADC ref clock is set at 24MHz, I am seeing some issue with
>>>>> touch screen pointer as the pointer jumps to random locations
>>>>> with free draw application. The issue is due to increase in ADC
>>>>> clock and charge delay for the touchscreen ADC line duration
>>>>> reduced.
>>>>>
>>>>> So the notation of ti,charge-delay in terms of ADC clock is
>>>>> wrong, it has to be represented in time and driver has to convert
>>>>> the charge delay time to ADC clocks based on what ADC clock
>>>>> frequency is set.
>>>>>
>>>>> Measured the performance with the iio_generic_buffer with the
>>>>> patch [2] applied
>>>>>
>>>>> Verified the touch screen on AM335x GP EVM and AM335x BBB LCD7
>>>>> cape with [3] dts for display and touch screen to work.
>>>>>
>>>>
>>>> Since there are acks from DT and MFD maintainers, can you pull the patch
>>>> series if you do not have any more comments.
>>>
>>> Cant do anything without *all* Acks.
>>>
>> Hi Dmitry Torokhov,
>>
>> Can you provide your inputs on the patch series.
> 
> You have my ack for the input bit.
> 

A gentle ping

Regards
Mugunthan V N