linux-kernel - Re: [PATCH] drivers: mfd: ti_am335x_tscadc: increase ADC ref clock to 24MHz

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Message-ID: <ae3d5312-a328-f643-7e0a-cacc5bb95d28@ti.com>
Date:   Thu, 27 Oct 2016 16:50:24 +0530
From:   Mugunthan V N <mugunthanvnm@...com>
To:     Lee Jones <lee.jones@...aro.org>
CC:     <linux-iio@...r.kernel.org>, Tony Lindgren <tony@...mide.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Vignesh R <vigneshr@...com>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        John Syne <john3909@...il.com>
Subject: Re: [PATCH] drivers: mfd: ti_am335x_tscadc: increase ADC ref clock to
 24MHz

On Monday 24 October 2016 11:32 AM, Mugunthan V N wrote:
> Increase ADC reference clock from 3MHz to 24MHz so that the
> sampling rates goes up from 100K samples per second to 800K
> samples per second on AM335x and AM437x SoC.
> 
> Also increase opendelay for touchscreen configuration to
> equalize the increase in ADC reference clock frequency,
> which results in the same amount touch events reported via
> evtest on AM335x GP EVM.
> 
> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>

Found issues with touchscreen usage with GUI on my AM335x GP EVM. Fixed
with change the "ti,charge-delay" DT property based on change in ADC
clocks. Will be sending v2 patch soon.

Regards
Mugunthan V N