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: <71482721-fd60-65b2-d601-f1698ce5fa0a@ti.com>
Date:   Fri, 25 Nov 2016 10:27:09 +0530
From:   Mugunthan V N <mugunthanvnm@...com>
To:     <linux-input@...r.kernel.org>
CC:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>, 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 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.

Regards
Mugunthan V N