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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Date:   Fri, 25 Nov 2016 09:59:18 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Mugunthan V N <mugunthanvnm@...com>
Cc:     linux-input@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        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 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.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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