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:

quoted

On Friday 25 November 2016 03:29 PM, Lee Jones wrote:

quoted

On Fri, 25 Nov 2016, Mugunthan V N wrote:

quoted

Hi Dmitry Torokhov,

On Thursday 10 November 2016 10:05 PM, Mugunthan V N wrote:

quoted

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
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