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: <8b97b7e6-1ea4-bf13-7da5-55135a994231@ti.com>
Date:   Tue, 29 Nov 2016 11:11:35 +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

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.

Regards
Mugunthan V N