Re: [PATCH 04/15] iio: adc: at91_adc: Add support for touchscreens without TSMR

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 16/03/2014 at 18:16:54 +0000, Jonathan Cameron wrote :
> On 05/03/14 17:35, Alexandre Belloni wrote:
> >Old ADCs, as present on the sam9rl and the sam9g45 don't have a TSMR register
> >and the touchscreen support should be handled differently.
> >
> >Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> One comment inline about handling of devices where the platform data doesn't
> include the touchscreen type.  I'd expect zero to be the current default
> rather than NONE...
> >diff --git a/include/linux/platform_data/at91_adc.h b/include/linux/platform_data/at91_adc.h
> >index fcf73879dbfe..7819fc787731 100644
> >--- a/include/linux/platform_data/at91_adc.h
> >+++ b/include/linux/platform_data/at91_adc.h
> >@@ -7,6 +7,12 @@
> >  #ifndef _AT91_ADC_H_
> >  #define _AT91_ADC_H_
> >
> >+enum atmel_adc_ts_type {
> This means that the default for existing touch screens (where the platform
> data won't include setting this value) will be none.  Is that correct?
> >+	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
> >+	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
> >+	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
> >+};
> >+

This is actually just a snippet that I moved from at91_adc.c to
at91_adc.h. I followed the current behavior.  Until now, using the
touchscreen was only supported through device tree and touchscreen
handling was not activated unless the atmel,adc-ts-wires property is
present.  I guess this is the sane way to go because when you use the
touchscreen, you lose the triggers.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com