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: <20161129210949.GB20680@dtor-ws>
Date:   Tue, 29 Nov 2016 13:09:49 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Mugunthan V N <mugunthanvnm@...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 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.

-- 
Dmitry